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Resolution - 2022-R0293 - Amendment No. 10 to PSA 15200 with RS&H Inc - Airport 6.28.22
Resolution No. 2022-RO293 Item No. 4.10 June 28, 2022 RESOLUTION BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF LUBBOCK: THAT the Mayor of the City of Lubbock is hereby authorized and directed to execute for and on behalf of the City of Lubbock, Amendment No. 10 to that certain Professional Services Agreement dated May 12, 2020 by and between the City of Lubbock and RS&H, Inc. and related documents, in connection with hangar roof replacement at the Lubbock Preston Smith International Airport (LPSIA). Said Amendment is attached hereto and incorporated in this resolution as if fully set forth herein and shall be included in the minutes of the City Council. Passed by the City Council on A EST: Rebecca Garza, City Se etary APPROVED AS TO CONTENT: June 28, 2022 RAY 4P R Kelly Campbell, Executive Director of Aviation First Assistant City Attorney ccdocs/RES.Contract-RS&H June 3, 2022 Uocu519n tnVelope IU: tbUL;Ut3U-UZUi-4Li4t-AZAt-13313UbZL -AfU4 Resolution No. 2022-RO293 a53� US 7ti RSW Lubbock Hangar Roof Replacement - T-302 (Barrel Roof Only) and Horton (Low Roof Only) May 10, 2022 City of Lubbock Texas Lubbock Preston Smith Int'I Airport LBB Contract No.: 15200 RS&H Project No.: 223-1874-010 Prepared by RS&H Inc. at the direction of Lubbock Preston Smith International Airport uocuti gn tnvelope 1u: tb9L;Ut Su-utc;s-4b4t-ptHt-1 J ibU ,&A/94 SCOPE OF WORK I PROJECT DESCRIPTION The City of Lubbock (the Airport) has requested that RS&H (Consultant) under the On -Call Agreement provide a scope and fee for Hangar Roof Replacement. RS&H evaluated the existing roofs of the Hangar roof T-302 and Horton low roof under separate contract. During that evaluation it was determined that the existing barrel-vaulted roof and structure of hangar T-302 and low roof and structure of Horton hangar are significantly worn and damaged requiring replacement. Note that the Horton Hangar upper roof scope is included and will be replaced under separate contract. Included in this scope will be the testing and subsequent evaluation of Hangar T-302 Barrel Roof (testing by Amarillo Testing & Engineering (ATE)). Analysis, recommendations, and structural design will be conducted by RS&H with new roof design by Loefgren and Associates. Further review of previously gathered data along with structural (RS&H) and new roof design (Loefgren and Associates) for the Horton Low Roof structure will be provided as part of this scope. The work will be broken into multiple tasks which will also separately reflect each of the two hangar roofs and their supporting structures. Included in the scope are those depicted with stars * : Lubbock Hangar Roof Improvements 2 uocubign tnvelope IU: tb9;Ut.SU-ULGS-4t$4t-ALHt-IJJt$UU:Zt-AfV4 SCOPE OF WORK Hangar Chaparral T-302 (barrel top only): Task 1 will include testing (by ATE) and an evaluation (by RS&H) of the existing structural roof systems. A model based upon findings from testing, will be created and recommendations will be provided (by RS&H). Task 1.1 = Existing Structural System Condition Verification performed by subconsultant ATE » Task 1.2 = Report/Drawings — Existing Roof Structural Assessment performed by RS&H Task 1.3 = Structural Analysis/Study (recommendations) performed by RS&H Task 1.4 = Project Management and Coordination performed by RS&H Task 2 will include structural (by RS&H) and roof design (by Loefgren & Assoc.) and development of 90%, permit, bid and conformed documents for procurement of a contractor to complete needed structural repairs and roof replacement. Task 2.1 = 90% Design and Documentation performed by RS&H and Loefgren and Associates Task 2.2 = Quality Control Review performed by RS&H Task 2.3 = Document Review Meeting performed by RS&H and Loefgren and Associates Task 2.4 = Permit Documentation and Coordination performed by RS&H and Loefgren and Associates Task 2.5 = Quality Control Review performed by RS&H Task 2.6 = 100% Bid Documentation performed by RS&H and Loefgren and Associates Task 2.7 = Quality Control Review performed by RS&H Task 2.8 = Project Management and Coordination performed by RS&H Horton Hangar Chaparral 310 (low roof only): Task 3 will determine any additional deterioration of the existing west low roof structure, will develop a structural analysis of the existing structure based upon previously obtained information as well as structural system recommendations. The structural work will be performed by RS&H. Task 3.1 = Existing Structural System Condition Verification Review performed by RS&H Task 3.2 = Structural Analysis/Study (recommendations) performed by RS&H Task 3.3 = Quality Control Review performed by RS&H Task 3.4 = Document Review Meeting performed by RS&H and Loefgren and Associates Task 3.5 = Project Management and Coordination performed by RSH Lubbock Hangar Roof Improvements 3 Uocubign tnvelope IU. hbVL;utsu-u2Us-4t54t-HLHt-13stsM&A194 SCOPE OF WORK Task 4 will include structural (by RS&H) and roof design (by Loefgren and Assoc.) and development of 90%, permit, bid and conformed documents for procurement of a contractor to complete needed structural repairs and roof replacement. Task 4.1 = 90% Design and Documentation performed by RS&H and Loefgren and Associates Task 4.2 = Quality Control performed by RS&H Task 4.3 = Documentation Review Meeting performed by RS&H and Loefgren and Associates Task 4.4 = Permit Documentation and Coordination performed by RS&H and Loefgren and Associates Task 4.5 = Quality Control performed by RS&H Task 4.6 = 100% Bid Documentation performed by RS&H and Loefgren and Associates Task 4.7 = Quality Control performed by RS&H Task 4.8 = Project Management and Coordination performed by RSH and Loefgren and Associates Excluded from the scope (including but not limited to): The following items are excluded from this Scope of Work: • Structural evaluation, documentation, or modifications of existing foundations, footings, columns (other than sizes and locations), hangar door supports, or slab(s) • Overall evaluation, documentation, or modifications of existing exterior building envelope (including but not limited to cladding, framing, windows/openings, drainage, slab conditions etc.) • Overall evaluation, documentation, or modifications of existing interior building conditions (including but not limited to interior framing, partitions, finishes, etc.) • Code analysis beyond that which is required to procure roof replacement for the barrel roof (T-302) and Horton (low roof) only • Any Engineering outside of what is listed in the scope (including but not limited to Electrical, Plumbing (roof drainage), Mechanical, Civil, IT/Security/low voltage, Fire Protection etc.) • HVAC equipment supports, curbs, equipment • Construction administration • Environmental services • Agency coordination • Resident Project Representative (RPR) services • Topographic surveys The Consultant design team is made up of the following professionals. Lubbock Hangar Roof Improvements 4 uocu5ign tnvelope lu: tb9UUt,Su-utt;s-4b4t-AZAt-7sslivatFA/94 SCOPE OF WORK Consultant/Subconsultant Involvement RS&H, Inc. Structural Analysis, Structural Design and Project Management Amarillo Testing & Engineering (ATE) Existing Structure Study Loefgren and Associates, Inc. (L&A) New Roof Design Project Duration — The Project's schedule is enumerated under the heading, "Proposed Project Schedule" below. The actual schedule may vary significantly as the Project design progresses and the scope is further developed. Given the potential of unknown procurement issues, specified materials may cause delays or even a need to redesign some aspects of the project. Changes to the Project schedule and/or design may require changes in the Consultant's efforts and require adjustments to the compensation indicated in this proposal. II PROJECT TASKS The work anticipated to be completed under this work order is identified in the tasks below. TASK 1 HANGAR CHAPARRAL T-302 (BARREL TOP ONLY) - ROOF ASSESSMENT The roof structure will be tested and documented by ATE. The resulting documentation will be reviewed by RS&H and subsequent structural recommendations will be provided. Task 1.1 Condition Verification (performed by subconsultant ATE) The Airport has confirmed that there is no available existing documentation of the hangar building for the Consultant to review. Consultant will field verify and document existing conditions. Findings will be presented in a field report, photographic documentation, roof plans, and/or details as required. The field visit will be performed by ATE, who will organize the use of a lift as required and coordinate access with the airport. Conditions found herein will be memorialized as part of Task 1.2. Task 1.2 Report/Drawings - Existing Roof Structure Assessment (performed by RS&H) The condition verification will be compiled into a field report, drawings and submitted to the Airport as part of the review documents. The report/drawings will summarize the findings as follows: Describe the methods by which the assessment was performed. Discuss current condition of the areas of the project to include areas of deficiency or compromise. Roof Structural Plans, elevations, sections and/or details to include all information required for RS&H to perform the structural analysis. This will include field verified: Lubbock Hangar Roof Improvements 5 uocutogn tnvelope 1u: tbyLutsu-uZt;s-4t$4t-AZAt-lsstsutstrHty4 SCOPE OF WORK o Comprehensive information regarding the steel roof structure, connections, elevations, and locations. o Comprehensive information regarding the steel column sizes and locations. Material tests to determine material properties. Based upon the findings of this meeting the project will move forward to Task 1.3. Task 1.3 Structural Analysis/Study (performed by RS&H) A structural analysis model will be developed and studied using the information gathered in Task 1.2 to determine the adequacy of the existing roof structure. Recommendations will be provided to address possible deficiencies in accordance with the existing building code dictated by the authority having jurisdiction. Task 1.4 Project Management and Coordination (performed by RS&H) Consultant will oversee scheduling, resource allocation, monitoring, oversight, direction, and control for all aspects of the design team's efforts including assembly and coordination of all documentation. TASK 2 HANGAR CHAPARRAL T-302 (BARREL TOP ONLY) - DESIGN AND DOCUMENTATION The barrel top roof and structure will be designed and detailed for 90%, permit and bid documents in conformance with applicable building codes and design guides, based upon the results of the work carried out under Task 1. Task 2.1 90% Design and Documentation (performed by RS&H and Loefgren and Associates) Based upon the results of Task 1, the 90% Construction Documents Phase will be based on the approved Structural Recommendations Proposal. The documents will include Drawings and Specifications that establish structural design requirements to comply with the needs of the proposed new roof design. Task 2.2 Quality Control (performed by RS&H) The Consultant shall conduct an in-house quality control review of this 90% stage submittal. The review shall cover the Drawings and Specifications prior to Submittal to the airport. Task 2.3 Documentation Review Meeting (performed by RS&H and Loefgren and Associates) Once the 90% Construction Documents have been produced, the design team and client will review prior to proceeding to Permit and Construction Documents during a virtual visit. Lubbock Hangar Roof Improvements 6 uocubign tnveiope iu: tti9L;ut'su-utLs-4b4t-AZAt-1s'stwuZ1-Ni94 SCOPE OF WORK Task 2.4 Permit Documentation and Coordination (performed by RS&H and Loefgren and Associates) Permit Documentation will be developed and coordinated, municipality permitting applications will be digitally prepared and uploaded to municipality interface. Task 2.5 Quality Control (performed by RS&H) The Consultant shall conduct an in-house quality control review of the Permit documents prior to submittal to municipality. Task 2.6 100% Bid Documents (performed by RS&H and Loefgren and Associates) Final 100% Bid Documents (including drawings and specifications) will be developed and all municipality permitting comments will be incorporated into the documents. Task 2.7 Quality Control (performed by RS&H) The Consultant shall conduct an in-house quality control review of the Bid Documents prior to submitting them for bid. Task 2.8 Project Management (performed by RS&H) Consultant will oversee scheduling, resource allocation, monitoring, oversight, direction, and control for all aspects of the design team's efforts including assembly and coordination of all documentation. TASK 3 HORTON HANGAR CHAPARRAL 310 (LOW ROOF ONLY) - CONDITION VERIFICATION The existing west low roof structural system will be evaluated, and recommendations will be made. Task 3.1 Condition Verification (performed by RS&H) The Airport has confirmed that there is no available existing documentation of the hangar building for the Consultant to review. Consultant will use information gathered during the latest field observation report dated January 24, 2022 (refer to Attachment D provided for convenience). Findings state that the total extent of the structural damage for the existing west low roof (structural timber) is currently undetermined. The visual survey of the existing east low roof structure, consisting of steel members, appeared to be in sound condition. This task will address the proposed structural work for the low west roof only. Conditions found herein will be memorialized as part of Task 1.2. Task 3.2 Structural Analysis/Study (performed by RS&H) A structural analysis model will be developed and studied using the information gathered in Task 1.1 and used to develop the design for structural repairs to the existing west low roof structure. Lubbock Hangar Roof Improvements 7 Uocu519n tnvelope IU: tbblUUtJU-UZUJ-4t34t-ALAt-I iJbUt$L&AIV4 SCOPE OF WORK Task 3.3 Quality Control (performed by RS&H) The Consultant shall conduct an in-house quality control review of the Documents prior to release to the airport for discussion. Task 3.4 Documentation Review Meeting (performed by RS&H) Once the Structural Analysis has been conducted and recommendations made, the design team and client will review prior to proceeding to 90% Design, Permit and Construction Documents during a virtual visit. Task 3.5 Project Management (performed by RS&H) Consultant will oversee scheduling, resource allocation, monitoring, oversight, direction, and control for all aspects of the design team's efforts including assembly and coordination of all documentation. TASK 4 HORTON HANGAR CHAPARRAL 310 (LOW ROOF ONLY) — DESIGN AND DOCUMENTATION The east and west low roofs and the structural system of the west low roof will be designed and detailed for 90%, permit and bid documents in conformance with applicable building codes and design guides, based upon the results of the work carried out under Task 3. Task 4.1 90% Design and Documentation (performed by RS&H and Loefgren and Associates) Based upon the results of Task 3, the 90% Construction Documents Phase will be based on the approved Structural Recommendations Proposal. The documents will include Drawings and Specifications that establish structural design requirements to comply with the needs of the proposed new roof design (see Loefgren Associates proposal Attachment C). Task 4.2 Quality Control (performed by RS&H) The Consultant shall conduct an in-house quality control review of this 90% stage submittal. Topics for review shall include the Drawings and Specifications, in advance of document submittal to the airport. Task 4.3 Documentation Review Meeting (performed by RS&H and Loefgren and Associates) Once the 90% Construction Documents have been produced, the design team and client will review prior to proceeding to Permit and Construction Documents during a virtual visit. Task 4.4 Permit Documentation and Coordination (performed by RS&H and Loefgren and Associates) Permit Documentation will be developed and coordinated, municipality permitting applications will be digitally prepared and uploaded to municipality interface. Lubbock Hangar Roof Improvements 8 uocubign tnvelope iu tb9t;UtSu-utt,3-4b4t-ALHt-1sst5UdZFH/V4 SCOPE OF WORK Task 4.5 Quality Control (performed by RS&H) The Consultant shall conduct an in-house quality control review of the Permit Documents prior to submitting them for permit review by the municipality. Task 4.6 100% Bid Documentation (performed by RS&H and Loefgren and Associates) Final 100% Bid Documents (including all drawings and specifications) will be developed and all municipality permitting comments will be incorporated into the documents. Task 4.7 Quality Control (performed by RS&H) The Consultant shall conduct an in-house quality control review. Topics for review shall include the Bid Drawings and Specifications, in advance of document submittal to the municipality for bidding purposes. Task 4.8 Project Management and Coordination (performed by RS&H) Consultant will oversee scheduling, resource allocation, monitoring, oversight, direction, and control for all aspects of the design team's efforts including assembly and coordination of all documentation. III ASSUMPTIONS Per the in -person perfunctory survey performed last Fall 2021, we noted degradation of the existing building envelopes at both the Hangar Chapparal T-302 and the Horton hangar Chapparal 310. General flashing/boot details will be included (at plane changes and equipment openings) where the existing conditions are in an appropriate state of repair to receive such flashings. It was not possible to assess all existing aspects of the buildings via the cursory visual survey as some conditions were either not accessible or were deemed unsafe for closer scrutiny at the time. If existing conditions are not water -tight and the limited flashing systems within the scope of this project are not enough to ensure water tightness of these buildings, additional work may be required to bring the buildings to water -tight condition, and adjustments may be made to the compensation indicated in this proposal. IV MEETINGS AND PRESENTATIONS The following site visits and Client meetings/presentations will be attended as part of this proposal: In -Person Conference Task Presentation / Meeting / Site Visit Consultant/ Meetings/Site Calls/ Subconsultant Visits Web -Based 1.1 Condition verification ATE x 1.2 Structural Analysis/Recommendation Meeting RS&H x 2.3 90% Documentation Review Meeting RS&H/L&A x 3.5 Structural Analysis/Recommendation Meeting RS&H x Lubbock Hangar Roof Improvements 9 uocu5ign tnveiope w: Lb!JUutsu-u2us-4b4t-AZHt-isstwd:&At!14 SCOPE OF WORK 4.3 90% Documentation Review Meeting I RS&H/L&A I I X V PROPOSED PROJECT SCHEDULE 1. Task 1 = Hangar Chaparral T-302 (barrel top only) - Condition verification and summary — 8 weeks 2. Task 2 = Hangar Chaparral T-302 (barrel top only) - Design and Documentation = 12 weeks a. 90% Construction/Permit Documents, and QC — 10 weeks b. Permitting — As conducted by municipality c. Addenda and Bid Document Completion —2 weeks d. Bidding/Procurement support - As conducted by municipality 3. Task 3 = Horton Hangar Chaparral 310 (low roof only) - Condition verification and summary — 3 weeks 4. Task 4 = Horton Hangar Chaparral 310 (low roof only) —12 weeks a. 90% Construction/Permit Documents and QC — 10 weeks b. Permitting — As conducted by municipality c. Addenda and Bid Document Completion — 2 weeks d. Bidding/Procurement support - As conducted by municipality Total duration: 21 weeks (Note that some of this work between the two hangars can occur concurrently). VI PROFESSIONAL SERVICES FEE AND FEE TYPE RS&H will provide the above referenced services for a Cost Plus Not -to -Exceed Fee of $249,565. No reimbursable expenses are anticipated to be included in this phase of work. See Attachments A, B, C and D for a breakdown of costs and reference documentation. Should scope items/activities/efforts/durations be modified at the request of the Airport or need to be adjusted based on design/construction scheduling, the Consultant Team will need to modify the fee to accommodate the changes. Such changes will be compensated through an amendment (through Additional Services requested by the Consultant) to the Task Order or similar vehicle. Effort, fee, and schedule adjustments resulting from a change in scope will be assessed and approved by the Airport prior to the execution of the change. Lubbock Hangar Roof Improvements 10 Uocu,Ign tnvelope IU: ttf l t3U-ULtrd-4t$4t-ALAI-/3JbUlfLtA/a4 CITY O 7OCK ray P Mayor T.- Rebecca Garza City Secretary APPROVED AS TO CONTENT: C��XA Kelly C pbell Executive Director of Aviation APPROPant M: jit SCOPE OF WORK RS&H, Inc. C .dJi:.,.8888D9CAB4E7 ntiv Amanda J. O'Krongley Vice President Lubbock Hangar Roof Improvements I V V owl twIr1l % I >ERVICES Hangar T-302 Roof Replacement - Existing Structural Verification, and Recommendation Hangar T-302 Roof Replacement - 90% Design, Permit and Bidding Horton Hangar Roof Replacement - Existing Structural Verification Horton Hangar Roof Replacement - 90% Design, Permit and Bidding TOTAL RS&H PROJECT FEE: Labor/ Professional Services (Cost Plus NTE) $ 42,100.96 Reimbursable Expenses $ 61,202.20 $ $ 35,692.29 $ $ 71,509.35 $ SUBCONSULTANT UTILIZATION SUMMARY Hangar T-302 Roof Replacement - Existing Structural Verification, and Recommendation o Testing & Engineering (ATE) an Consulting - Design- 100% Bid Documents Horton Hangar Roof Replacement - Existing Structural Verification an Consulting - Design- 100% Bid Documents Subtotal $ 22,560.00 $ - $ $ 11,000.00 $ - $ $ 5,500.00 $ - $ 39,060.00 $ - RS&H PROFESSIONAL SERVICES AND SUB -CONSULTANT FEE SUMMARY rofessional Services $ 210,504.80 isultant Fees $ 39,060.00 84.35% 15.65% oposal: $ 249,564.80 100.0% uocu5ign tnvelope Iu: tb9UUtsu-utus-4t$4t-vet-lsstsuu,&AtS4 ATTACHMENT NA AT8& LBB HANGAR ROOF REPAIR AND REPLACEMENT ASSESSMENT AMARILLO TESTING & ENGINEERING, INC Scope/Background: Date: 02/23/2022 Client: RS&H Location: Lubbock, TX Project: LBB Hangar Roof Repair and Replacement Assessment Company Work Order: Project Scope: The roof of an existing structure is proposed to be replaced/repaired. The existing building (Hangar 302) is barrel vault hangar at Lubbock Preston Smith International Airport. Consultant Scope of Work: Amarillo Testing & Engineering, Inc. will conduct a forensic assessment of the current roof structure. It appears there are no structural drawings of the existing hangar. The assessment will consist of a site investigation to achieve a better understanding of the current conditions of the roof system. Amarillo Testing will determine member sizing and spacing of the in -place joists, notate any physical deficiencies seen at the time of our investigation, and conduct minimal destructive testing on existing members. Lift access will be needed to properly inspect the roof system, the cost/coordination of lift access has been omitted in this proposal. We will work with RS&H engineers to ensure the information gathered is sufficient for the analysis of the existing structure. Service Sites: Services shall be performed at the following locations: ■ Project administration, oversight and reporting to be performed at Amarillo Testing & Engineering's office in Amarillo, TX. ■ Project field observations to be performed at Lubbock Preston Smith International Airport in Lubbock, TX. Deliverables: Deliverables for the project to include: As -built Drawings Metallurgy Report for Current Steel Members Report of Physical Findings 1113 N MCMasterS St. Amarillo TX 79106 1 P: 806-374-9756 1 F• atP(n�amarillntPctinn rnm I W• uuv"i mmnrillntnctinn rnm uocubign tnveiope w: tb9UULJu-u2t;s-4t34t-AZAt-1sstwa,&AtV4 Fee/Performance Schedule: ■ Not -to -Exceed Total Engineering Services Fee $22,560.00 This proposal is made on the estimation of time and materials need to complete the project. Field investigation/observations will begin once given notice to proceed. Client change order will nullify this proposal and a new fee will be established according to the change order. Client/Proiect Management: Client Project Lead: Randy Musser, PE, LEED AP RS&H 10748 Deerwood Park Blvd South Jacksonville, FL 32256 randy.musser(arsandh.com Signature / Date Consultant Project Lead: Jose A Gonzalez, PE Amarillo Testing & Engineering, Inc 1113 N McMasters Street Amarillo, TX 79106 igonzalez(a)amarillotesting.com Signature / Date 1113 N McMasters St. Amarillo TX 79106 1 P: 806-374-2756 1 E: atpOamarilintPctinn rnm I W• vjuuuu mmnrillntnctinn enm UOcuNgn tumpe IU: tb`JI;Ut.SU-UZ ;J-4t$4t-HLHt-IJJbU2$21-AtV4 ATTACHMENT C LOEFGREN & ASSOCIATES, INC. ROOFING AND BUILDING ENCLOSURE. CONSULTING SERVICES March 30, 2022 RS&H, Inc. Sloan Lavery, Assoc. AIA 300 W Adams St #400 Chicago, IL 60606 Subject: Proposal for Additional Roof Consulting Services LBB Hangar Roof Replacement Lubbock Preston Smith International Airport, Lubbock, Texas L&A Proposal 21-244 Revision D RS&H Project 2231874.005 Dear Sloan: Following your telephone conversations with Kenneth H. Loefgren, RRC, we propose to provide additional roof consulting services to help facilitate repairs and/or construction of the roofs of the hangar buildings listed below at the Lubbock Preston Smith International Airport in Lubbock, Texas. 1. Hangar 302 (Barrel top roof only) 2. West low roof of Horton Hangar (aka Hangar Building #310) Services described below are additional services to our proposal 21-244 C dated February 9, 2022. Project Information During our assessment of the hangar roofs, we discovered structural damage to two of the roofs that was not anticipated when we prepared our original proposals. Our assessment and recommendations were documented in our report dated January 17, 2022. The corrugated metal roof panels of Hangar 302 have experienced significant damage and must be removed and replaced. Given the amount of rotten wood within the existing roof assembly and the number of loose or missing fasteners, the existing roof panel attachment does not appear capable of meeting the wind uplift design criteria for roof assemblies. As such, we recommend replacement of the roof deck with roof panels that will span between the existing steel bar joists and meet the design criteria of the building code. 1093 A I A BEACH BLVD., PMB440 • ST. AUGUSTINF BEACH, FLoRinA 32080. 904-699-1462 www.loefgrenandassociates.com Uocubign tnvelope IU: tb9L;UtJU-ueLs-4t34t-HLHt-IJ,3bU2SLrH/94 SLOAN LAVERY, Assoc. AIA, RS&H, INC. MARCH 30, 2022 PROPOSAL 21-244 REVISED FOR ROOF CONSULTING SERVICES PAGE 2 OF 7 LUBBOCK PRFSTON SMITH INTERNATIONAL AIRPORT, LUBBOCK, TEXAS The west lower -level roof of the Horton Hangar appeared to have a relatively new R-panel metal roof system with exposed fasteners. Much of the wood roof deck and structural framing beneath the metal roof panels appeared to be rotten. Some structural framing members have significant deflection. Removal and replacement of the roof panels as well as replacement of the structural framing is recommended. Since the rotten roof deck and framing are safety concerns, access to building areas below this roof area should be prohibited and necessary safety barricades should be installed. In order for us to proceed with preparation of construction documents for replacement of metal roof systems at these areas, a revision to our scope and fee is required. As requested, fees for additional services are separated into the following tasks for each building. STRUCTURAL SCOPE PERFORMED Structural Analysis UNDER SEPERATE CONTRACT Our scope and fee do not include structural evaluations, designs of structural repairs or replacements, or preparation of construction documents to facilitate repairs and replacements of structural framing. We understand that the existing metal roofs on will require removal and replacement. The City of Lubbock, Texas website indicates that construction is governed by the 2015 International Building Code. We assume that the existing roof framing assemblies will comply with the structural requirements of the Section 707.3.2 of the 2015 International Existing Building Code which states: 707.3.2 Roof diaphragms resisting wind loads in high -wind regions. Where roofing materials are removed from more than 50 percent of the roof diaphragm or section of a building located where the ultimate design wind speed, VLI,, determined in accordance with Figure 1609.3(1) of the International Building Code, is greater than 115 mph or in a special wind region, as defined in Section 1609 of the International Building Code, roof diaphragms, connections of the roof diaphragm to roof framing members, and roof -to -wall connections shall be evaluated for the wind loads specified in the International Building Code, including wind uplift. If the diaphragms and connections in their current condition are not capable of resisting at least 75 percent of those wind loads, they shall be replaced or strengthened in accordance with the loads specified in the International Building Code. Our scope and fee do not include a structural evaluation of the existing roof framing assemblies to verify that the existing structure is capable of resisting 75 percent of the current wind loads. If metal roof systems require replacement, we understand that RS&H will perform structural evaluations, calculations and determine design criteria for selection and construction of the replacement roof assemblies. Loefgren & Associates, Inc. will prepare plans and specifications to facilitate removal and replacement of the existing roof systems. Uocubign tnvelope IU: tbUUUtJU-UZUi-4b4t-HLAt-133t$UdZI-AtU4 SLOAN LAVERY, Assoc. AIA. RS&H, INC. MARCH 30, 2022 PROPOSAL 21-244 REVISED FOR ROOF CONSULTING SERVICES PAGE 3 OF 7 LUBBOCK PRESTON SMITH INTERNATIONAL AIRPORT, LUBBOCK, TEXAS Task 1— Additional Consulting Services for Preparation of Construction Documents L&A will prepare drawings and technical specification sections to help facilitate the construction of new metal roof assemblies for Hangar 302 and the west low roof of the Horton Hangar. The construction scope of work is anticipated to include removal of the existing roof assembly and installation of new insulation and roof assembly. Construction documents will include plans, technical specification sections, and other miscellaneous documents as determined by L&A and RS&H to be appropriate. Construction documents will be prepared so they can be provided to the contractors for bidding purposes and for constructing the project. Our fee is based on preparation of these documents in conjunction with the planned replacement of metal roof panels for the remainder of Horton Hangar as described in our Proposal 21-244 6 dated February 9, 2022. In order to prepare this fee estimate, L&A assumed a construction duration of ten (10) weeks and one (1) site visit. The proposed fee for the single site visit is split between all three buildings. If the additional services for one or more buildings are not authorized, the actual fee per building will increase accordingly. Fees might vary if the actual durations or activities are different from the stated assumptions. Uocu6ign tnvelope Iu: tbyLUtsu-u[L,s-4b4t-HLHt-14JbU strHta4 SLOAN LAVERY, ASSOC. AIA. RS&H, INC. MARCH 30, 2022 PROPOSAL 21-244 REVISED FOR ROOF CONSULTING SERVICES PAGE 4 OF 7 LUBBOCK PRESTON SMITH INTERNATIONAL AIRPORT, LUBBOCK, TEXAS Fees Based on the scope of services and the assumptiqj6cWcj&1JjQvithin this proposal, we propose to furnish the services listed above for the following fees which include all anticipated related expenses: Hangar 302 (Barrel top roof only) Task 1— Preparation of Additional Construction Documents, ........$11,000.00 Horton Hangar (aka Hangar Building #310) Task 1— Preparation of Additional Construction Documents, ........... $5,500.00 Fee Schedule for Additional Services If additional services are requested, fees will be charged in accordance with the following fee schedule: Professional Services, Principal .................................................... $195.00 per hour Additional site visit, Principal....................................................... $9,500.00 per visit For site visits, travel time to and from the facility will be included in chargeable time. Other miscellaneous expenses, if any, such as printing and mailing costs, exclusive of normal overhead, will be charged on a direct reimbursable basis. Subcontractor fees, if any, and miscellaneous expenses such as laboratory fees and shipping costs will be charged at direct cost plus 15-percent. Fees and rates quoted herein are subject to change without notice after December 31, 2022. uocubign tnvelope IU: tbyt:Ut3U-UL1:3-4b4t-ALAt-1SStfU23L1-A/y4 SLOAN LAVERY, Assoc. AIA, RS&H, INC. MARCH 30, 2022 PROPOSAL 21-244 REVISED FOR ROOF CONSULTING SFRVICES PAGE 5 OF 7 LUBBOCK PRFSTON SMITH INTERNATIONAL AIRPORT, LUBBOCK, TEXAS The Contractor, not the Consultant, is responsible for the construction of the project, and the Consultant is not responsible for the acts or omissions of any contractor, subcontractor or material supplier; for safety precautions, programs or enforcement; or for construction means, methods, techniques, sequences and procedures employed by the Contractor. Authorization We appreciate this opportunity to assist with this project. In order to formally authorize our services, please complete the client invoice information below, sign in the space provided, and return a copy to us. We are looking forward to working with you. If you have any questions, please call me at 904-699-1462. Sincerely, Loefgren & Associates, Inc Digitally signed by Kenneth H. Loefgren Kenneth H• emLoefg re n em cn=Kenneth Loefgren, s Loefgren &Associates, Inc., ou, ail=ken@loefgrenandassociates.com, c=US Date: 2022.03.30 11:30:07-04'00' Kenneth H. Loefgren, RRC Principal An electronic "pdf' copy of this document may be transmitted for convenience. If requested, signed original documents will be transmitted by U. S. Mail. For payment of charges, invoices shall be submitted to: Client: Attention: Address: email: phone: Proposed scope of services authorized by: (signature), Date: Print name: , Title: Uocuti gn tnVeiope w, tb9L Ut.SU-UL(:3-4t$4t-ALAt-I I ibUt$Zt A/y4 ATTACHMENT D FOR REFERENCE Lubbock Hangar Roof Improvements (Repair/Replacement) UpdatE January 24, 2022 City of Lubbock Texas Lubbock Preston Smith Intl Airport LBB Contract No.: *15200.4 RS&H Project No.: 223-1874-004 & 223-1874-005 Prepared by RS&H h7c. at the direction of Lubbock Preston Smith International Airport RUH uocubign tnvelope iu: tbVUUtSu-utLs-4t$4t-aGAt-lastSu2S,&Afa4 Site Observations Dear Kelly, RS&H with the assistance of our consultant Ken Loefgren and Associates, conducted site inspections on November 17 and 18, 2021 of 6 existing hangar roofs at Lubbock Preston Smith International Airport. The following is a summary of our inspections with proposed approaches for how the airport authority may choose to address repairs/replacement. The following hangars were observed: 1. Hangar 20 (Lubbock Aero) — Recommend roof repair 2. AeroCare Hangar - Recommend roof repair 3. Berry T-Hangar - (North set only) - Recommend roof repair 4. Hangar-302 — (Barrel top only) Propose roof replacement with further structural assessment (proposed new scope) 5. Warehouse 720 — Air Spares — Recommend roof replacement 6. Horton Hangar — Chapparal 310 — Propose roof replacement and structural repairs In the following pages, you will find Ken Loefgren's written assessment along with a description of the structural observations of RS&H Engineer, Juan Salas. As required, we can provide a revised scope and fee proposal to follow this documentation. Sincerely, Sloan A. Lavery Lubbock Hangar Roof Improvements 2 uocu5ign tnvelope IU. tbK;Ut SU-UA J-4t54t-AZAt-1'sst$=&A/94 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment 1.1 LBB Hangar Roof Repair and Replacement Assessment On November 17, 2021, Kenneth H. Loefgren, RRC of Loefgren & Associates, Inc. performed cursory assessments of existing roofs of the following hangar buildings at the Lubbock Preston Smith International Airport (LBB). Mr. Loefgren was accompanied by Steve Westerbeke of RS&H and Bruce of LBB. Hangar Roof Repairs (RS&H Proiect No. 233.1874.004 1. Hangar 20 (aka Lubbock Aero) 2. AeroCare Hangar 3. Berry T-Hangars (North set only). 4. Hangar 302 (Barrel top only) Hangar Roof Replacements (RS&H Project No. 233.1874.005) 5. Warehouse 720 (aka Air Spares) 6. Horton Hangar (aka Hangar Building #310 (Chaparral)). The purpose of the assessments was to review the condition of the existing roofs and determine necessary and appropriate roof repairs and/or replacements. Recommendations are based on the visual observations only. 1.2 EXISTING DOCUMENT REVIEW No construction documents were available for any of the buildings that were observed. Therefore, existing structural shapes, materials, and connection capacities are unknown. 1.3 ROOF ASSESSMENT OBSERVATIONS The following sections provide a summary of our observations. 1.3.1 Hangar 20 (aka Lubbock Aero) Hangar 20 (aka Lubbock Aero) is a pre-engineered metal building (PEMB) manufactured by A&M Building Systems, Inc. of Clovis, NM 505-769-2311. Access to the interior of building was not available. We understand there were no reports of water intrusion. The existing roof appeared to include R-panels or PBR- panels that are often used on pre-engineered metal buildings. Exposed fasteners were observed at purlins, panel end laps, side laps and flashing details. Purlins were spaced approximately 5'-0" o.c. The roof slopes from an unvented center ridge to continuous gutters and downspouts on each side of the building. The roof slope was approximately 1-inch per foot. The roof includes fiberglass skylights and round penetrations presumed to be for space heater chimneys. Overall, the coating appears to be in good condition with sealant applied over and around the exposed fasteners. Imagery 02021 Google: Map data © 2021 Page 1 of 10 Uocu6ign tnvelope IU: tbyl:UtsU-u[Ls-4t54t-AZAt-1sstsM&A/a4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment Recommended repair scope includes replacement of fiberglass skylights, replacement of existing fasteners, and re -coating of the roof. Possibly add safety cages or fall protection nets below skylights. Also, need to determine if the existing coating is silicone to make sure new coating is compatible with substrate. 1.3.2. AeroCare Hangar The AeroCare Hangar is a pre-engineered metal building (PEMB). The existing roof appeared to include R-panels or PBR-panels that are often used on pre-engineered metal buildings. Exposed fasteners were observed at purlins, panel side laps, end laps and flashing details. The roof slopes from an unvented center ridge to continuous gutters and downspouts on each side of the building. The roof slope was approximately 1-inch per foot. The lower - level roof north of the hangar bay has several curb - mounted HVAC units. The tenant reported roof leaks near the southeast corner (left of hangar door), north east corner (below antennae tripod), and above the landside entry door near the southwest corner of the building. Apparent water damage to the roof insulation was observed near the southeast corner. Overall, most of the existing roof coating appeared to be deteriorated. Preparation for the existing coating application appeared to have included sealant tape at panel end laps and side laps and sealant applied over and around the exposed fasteners. Imagery 02021 Google, Map data © 2021 The roof above the hangar door pocket at the northeast corner of the hangar appeared to be a black EPDM membrane. Some of the roof membrane edge stripping was split and edges of laps appeared to be partially unsealed. On the west side of the building, numerous wall siding fasteners appeared to be loose and should be replaced as a maintenance item. Recommended repair scope includes repair of roof penetrations, replacement of damaged insulation, replacement of existing fasteners and re -coating of the roof. Replacement of the EPDM roof membrane above the hangar door pocket should be considered. Page 2 of 10 UOcuJign tnveiope IU: tb!JL;UtSU-UZUJ-4t34t-ALAt-13ft$UtSLhAfV4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment 1.3.3. Berry T-Hangars (North set only) Imagery 02021 Google, Map data © 2021 The roof of the Berry T-Hangars appeared to be a corrugated metal roof. All of the hangars were locked so the structural framing could not be observed. We understand there were no reports of water intrusion. The roof slopes from an unvented center ridge at approximately 4-inches per foot. No gutters or downspouts were observed. The roof panels appeared to be secured with nails presumably fastened to wood or plywood decking or wood purlins bearing on rafters. We could not determine if there was any underlayment membrane below the metal panels. No sealant was observed at laps between the corrugated metal panels nor at any of the exposed fasteners. Some of the laps between panels did not appear to be tightly sealed. Overall, most of the coating appears to be in fair to poor condition. Recommended repair scope includes replacement of existing nail fasteners with gasketed screw fasteners and re -coating of the roof. Painting will help extend life of roof metal but will not likely correct existing roof leaks, if any. :nr Page 3 of 10 UOcuNgn tnvelope IU: tb!JUUt3U-UZL;.J-4t$4t-ALAt-133tfUt$L&AfV4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment 1.3.4. Hangar 302 (Barrel top only) Imagery 02021 Google, Map data © 2021 The barrel vault roof of Hangar 302 (former Chaparral Hangar) appeared to consist of corrugated metal roof panels with some surface corrosion below peeling paint. The steep slope roofs at the rear (east) of the hangar bay also appeared to consist of corrugated metal roof panels bearing on wood framing but those roofs were not included in our scope of services. Most of the corrugated metal roof panels on the barrel vault roof of Hangar 302 appeared to be nailed to wood blocking that was presumably bolted to the top chord of steel bar joists. Wood 2x6 or 2x8 boards were observed between and parallel to the steel bar joists. Both the wood boards and steel bar joists spanned between large bowstring trusses. The wood boards between the steel bar joists should not be considered structural members because the span between trusses is 20-feet Many of the roof nails appeared to be missing or partially backed out. The wood nailers and wood boards were likely rotten and unable to hold any fasteners. Page 4 of 10 UocuJlgn tnvelope IU' tbV(,UtSU-ULl.3-4t$4t-ALAt-l-JibUtSLtAfU4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment Holes in the roof were observed in many places throughout the roof presumably where fasteners have loosened or fallen out. Brown stains that appeared to be corrosion were observed on the bottom of the metal roof panels especially near the hangar doors. Remnants of wood sheathing or thin insulation board were observed on top of joists and wood nailers. A large section of roof panels above the northside of the hangar bay appeared to have been replaced with corrugated roof panels with a similar roof deck profile. The newer panels were attached directly to top chord of the bar joists. Wood nailers and wood boards between the bar joists were not replaced in this area. Given the amount of rotten wood within the existing roof assembly and the number of loose or missing fasteners, the existing roof panel attachment does not appear capable of meeting the wind uplift design criteria for roof assemblies. As such, we recommend replacement of the roof deck with roof panels that will span between the existing steel bar joists and meet the design criteria of the building code. We do not recommend coating of the existing roof assembly. We recommend that the scope of our services be changed from preparation of construction documents to facilitate re -coating the existing roof to replacement of the existing roof. Page 5 of 10 UOCUJIgn tnvelope iu: tbVL;Utsu-UZU.J-4t$4t-ALHt-I.J.JbU ZI-AtU4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment 1.3.5 Warehouse 720 (aka Air Spares) Imagery 02021 Google, Map data © 2021 Warehouse 720 (aka Air Spares) is used for storage of airport maintenance equipment and materials. We understand that the building was constructed over 30 years ago with materials manufactured by Metallic Building Systems of Houston, Texas. The roof appeared to consist of corrugated galvanized or galvalume steel roof panels and fiberglass skylights. The roof panels slope at approximately 4 inches per foot from a center ridge to gutters on each side of the building. The panels appeared to be secured to the purlins with wires wrapped around the bottom flange of the purlins. Most of the roof panels have visible surface corrosion. Many of the skylight panels are cracked or broken. The gutters are damaged and downspouts are missing. We recommend replacement of the existing roof panels with standing seam roof panels that are continuous from ridge to eave along with new gutters, downspouts and continuous ridge vents. Page 6 of 10 uoCUJIgn tnvelope iu: tbat;UtJu-UZU.J-4t$4t-HLHt-Isstsut$�&AfU4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment The City of Lubbock, Texas website indicates that construction is governed by the 2015 International Building Code. In order to remove and replace the existing metal roofs, a structural evaluation is required to comply with Section 707.3.2 of the 2015 International Existing Building Code which states: 707.3.2 Roof diaphragms resisting wind loads in high -wind regions. Where roofing materials are removed from more than 50 percent of the roof diaphragm or section of a building located where the ultimate design wind speed, Vui,, determined in accordance with Figure 1609.3(1) of the International Building Code, is greater than 115 mph or in a special wind region, as defined in Section 1609 of the International Building Code, roof diaphragms, connections of the roof diaphragm to roof framing members, and roof -to -wall connections shall be evaluated for the wind loads specified in the International Building Code, including wind uplift. If the diaphragms and connections in their current condition are not capable of resisting at least 75 percent of those wind loads, they shall be replaced or strengthened in accordance with the loads specified in the International Building Code. Since demolition of roofing materials may impact other building materials, a survey and abatement of hazardous materials, if any, may be required. Page 7 of 10 uocubign tnvelope IU: tbVUUt.Su-utL,s-4t$4t-AZAt-lsst$Ud,&Ata4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment 1.3.6 Horton Hangar (aka Hangar Building #310 (Chaparral)). Imagery ©2021 Google, Map data C 2021 The Horton Hangar (aka Hangar Building #310) is used for storage of airport maintenance equipment and materials. We understand that the hangar building was constructed before World War II. The upper level and east lower -level roofs appeared to have corrugated metal roof panels with surface corrosion. The roof panels slope at approximately 1-inch per foot from a center ridge to gutters on the east and west sides of the building. The metal roof panels appeared to be secured with small carriage -type bolts with rounded heads on top and square nut and washer bolted to hook clips at the bottom of steel purlins. Thin insulation boards appeared to be bolted to the roof panels with similar bolts, nuts, and washers. We observed numerous stains that indicate chronic roof leaks. Y Upper Roof Upper Roof Framing Page 8 of 10 Uocu5lgn tnvelope IU. tb9L Ut SU-ULC:S-4b4t-ALAt-1 i ibUb,&A/y4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment :P Lower East Roof I Lower East Roof Framing N The west lower -level roof appeared to be a relatively new R-panel metal roof with exposed fasteners. It was installed over a wood deck and possibly over an old roof. Much of the wood roof deck and framing appeared to be rotten and will need to be replaced. Since the rotten roof deck and framing are safety concerns, access to building areas below this roof area should be prohibited and necessary safety barricades should be installed. Based on the apparent condition of the Lower West Roof, removal and replacement of the roof panels as well as replacement of the structural framing is recommended. A structural evaluation and design for replacement of the wood structural framing was not anticipated nor included in the scope of our services. In order for us to proceed with the design for replacement of this roof area, a revision to our scope and fee is required. Based on the apparent condition of the Upper Roof and the Lower East Roof, removal and replacement of the roof panels is recommended. The City of Lubbock, Texas website indicates that construction is governed by the 2015 International Building Code. In order to remove and replace the existing metal roofs, a structural evaluation is required to comply with Section 707.3.2 of the 2015 International Existing Building Code which states: Page 9 of 10 UocuJl9n tnvelope IU: tbyl:UtJU-UZUJ-4t54t-ALAt-1 MbUtL&AN4 RS&H Project No. 233.1874.004 and 233.1874.005 LBB Hangar Roof Repair and Replacement Assessment 707.3.2 Roof diaphragms resisting wind loads in high -wind regions. Where roofing materials are removed from more than 50 percent of the roof diaphragm or section of a building located where the ultimate design wind speed, V„it, determined in accordance with Figure 1609.3(1) of the International Building Code, is greater than 115 mph or in a special wind region, as defined in Section 1609 of the International Building Code, roof diaphragms, connections of the roof diaphragm to roof framing members, and roof -to -wall connections shall be evaluated for the wind loads specified in the International Building Code, including wind uplift. If the diaphragms and connections in their current condition are not capable of resisting at least 75 percent of those wind loads, they shall be replaced or strengthened in accordance with the loads specified in the International Building Code. Since demolition of roofing materials may impact other building materials, a survey and abatement of hazardous materials, if any, may be required. Page 10 of 10 Uocutlgn tnvelope IU: 1=bVL;UtS1J-1JZUJ-4t541=-ALA1=-1JJ1JU25LhAfU4 STRUCTURAL SITE OBSERVATIONS Structural Site Observations Report Lubbock Hangar Roof Improvement Update 2.1 STRUCTURAL SITE ASSESSMENT On November 18th of 2021, RS&H and Loefgren & Associates, Inc. personnel performed a cursory assessment of three existing Hangars at the Lubbock Preston Smith International Airport (LBB). The purpose of the assessment was to review the condition of the existing roof framing and determine if there are any visible structural distress to the roof structure. Observations were made from the ground on all locations except as noted and recommendations are based on the visual observations only. The following Hangars were observed: 4. Hangar-302 — (Barrel top only) 5. Warehouse 720 — Air Spares 6. Horton Hangar— Chapparal 310 * Numbers above correspond to key plan on page 2 2.2 EXISTING DOCUMENT REVIEW No existing documentation is available for reference on any of the buildings that were observed. Therefore, existing structural shapes, materials, and connection capacities are unknown. 2.3 STRUCTURAL ASSESSMENT OBSERVATIONS The subsequent sections detail our observations. 2.3.1 Hangar-302 — (Barrel top only) The Hangar-302 — (Barrel top only) roof structure consists of two different type of structural roof systems and elevations, see Figure-2-1. Structural assessment for this building was not originally included in the scope of services for this project. The following include field observations for information. The structural roof framing systems are as follows: 1. Roof Area 1: West high roof structural framing, consists of a steel truss with the top -chord curved and steel joists with intermediate wood joist roof system (Figure-2-2). The steel joist appeared to have a wood member attached to the top chord. 2. Roof Area 2: East low roof structural framing consists of wood joist/purlin system (Figure-2-3). However, this area is not within our scope of services. 3. Roof Area 3: Hangar door roof structural framing consists of steel framing. Page 1 of 9 J. UocuSign tnvelope IU. tbyl;UtSU-ULl:S-4t$4t-ALAt-133t3Ubf&A/!J4 STRUCTURAL SITE OBSERVATIONS Figure-2-3: Hangar East Roof Framing 2.3.1.1 Structural Distress Observed • Roof Area 1: West high roof steel framing had no visible structural distress. Wood roof framing appeared to have water damage and one wood joist was fractured. Based on existing conditions observed the replacement of the roof deck, as proposed by Ken of Loefgren & Associates, Inc., will require additional investigation of the existing roof structure. The investigation should include but not limited to: 1. Steel and Wood Joist — Member size, material properties, and connection properties. 2. Curved steel truss - Member size, material properties, and connection properties. 2.3.1.2 Additional Proposed Structural Scope of Services Summary • The additional structural scope of services required for performing the proposed roof replacement is as follows: 1. Structural analysis of existing roof structure only. Analysis will be performed based on the information acquired from the pending investigation. 2. Structural documents that include: • Information necessary for building permit • Required roof repair/retrofit details • Based on our observations, we do not anticipate that the new structural scope of work will require any additional work other than the curved roof framing. Page 3 of 9 Uocutign tnvelope IU: tb9UUt6U-U2UJ-4t34t-AtHt-1sstSM&AtU4 STRUCTURAL SITE OBSERVATIONS 2.3.2 Warehouse 720 — Air Spares The Warehouse 720 — Air Spares roof structure consists of steel frames with purlins, see Figure-2-4 (Plan shown is for reference only) and Figure-2-5. W-3- 11 Figure-2-4: Roof Plan & Front of Warehouse Figure-2-5: Warehouse Roof Framing 2.3.2.1 Structural Distress Observed Warehouse roof steel framing had no visible structural distress. Page 4 of 9 uocuNgn tnveiope IU- tbat;UtJU-utt;'s-4r34t-A2At-l'5J UtsZrAfV4 STRUCTURAL SITE OBSERVATIONS 2.3.3 Horton Hangar — Chapparal 310 The Horton Hangar — Chapparal 310 roof structure consist of three different type of structural roof systems and elevations, see Figure-2-6 (Plan shown is for reference only). The structural roof framing systems are as follows: 1. Roof Area 1: West low roof structural framing consists of a wood plank deck over wood joist roof system (Figure-2-7). 2. Roof Area 2: Center high roof structural system consists of a steel truss and purling roof framing (Figure-2-8). 3. Roof Area 3: East low roof structural framing consists of steel beam framing (Figure-2-9). 4. Roof Area 4: Hangar door roof structural framing consists of steel framing. nQGFAREA4 H H R 3-E. TRESS ROOF FR CR4 'poor AREA 2 ? I i RClSF t, I , Figure-2-6: Roof Plan & Front of Hangar Page 5 of 9 VIA. - ilk i���� vv ' - -,jr -71 '-M!y_3gj1 . Uocu6ign tnveiope iu: tb9UUt6u-L)Z ;s-4twt-AZAt-Is'stwutrAfV4 STRUCTURAL SITE OBSERVATIONS Figure-2-9: East Low Roof 2.3.3.1 Structural Distress Observed • Roof Area 1: West low roof wood framing has severe water damage. The area with a second floor was not accessible due to unsafe access points. Complete extent of the water damage was not accessed due to the limited access and cladding covering the structural roof framing. Reference Figure-2-10 and Figure-2-11 for typical observed conditions. The removal of the compromised wood plank deck and reinforcement of the compromised wood joist is recommended. Page 7 of 9 uocut-jign tnveiope iu: tbyl:ut6u-utc;s-4b4t-HZHt-isstsutstrpia4 STRUCTURAL SITE OBSERVATIONS Figure-2-10: Compromised Roof Structure i Figure-2-11: Compromised Roof Structure Page 8 of 9 uocubign tnveiope IU: tbyLutsu-UZL;J-atsat-HLHt-IsstsudZL -Atya STRUCTURAL SITE OBSERVATIONS • Roof Area 2: Center high roof showed signs of water intrusion in several locations. An up -close observation was performed at one location and the steel purlins observed did not show structural distress from the water exposure, see Figure-2-12. Figure-2-12: Center High Roof Water Intrusion • Roof Area 3: East low roof steel framing had no visible structural distress. The south half of the area with a second floor was not accessible due to unsafe access points. Page 9 of 9