13 34 19.01 Metal Bldg Roofing Thermal Insulation Systems.pdf

Lamar Community College Repair Roof and Ceiling, Indoor Arena, and Stalls Project Number: 2024-077M23

METAL BUILDING ROOFING AND THERMAL INSULATION REPLACEMENT SYSTEMS 13 34 19.01 - 1 (Bid & Const. Set)

SECTION 13 34 19.01 - METAL BUILDING ROOFING AND THERMAL INSULATION REPLACEMENT SYSTEMS

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes replacement of:

1. Standing Seam Metal Roof Panels.

2. Thermal insulation for Metal Building Roofing.

3. Accessories.

B. The replacement of the metal building roofing and roof insulation systems are considered a delegated design. The contractor shall engage a qualified professional engineer to review existing field conditions and select and design appropriate replacement systems in accordance with the material and performance criteria established on the drawings and within this specification.

C. Work Sequence and Planning: See Division 1 Specification Sections and 02 41 19 Selective Demolition for additional information on the requirements for careful work sequencing, work performance and planning.

D. Reference Specifications: See Section 07 21 00 for Rigid Roof Insulations and Concealed Wall insulations. See 07 42 00 for replacement Metal Wall Panels.

1.2 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site to discuss the roofing and roofing insulation installations.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of metal building roofing system component and roofing insulation component.

B. Shop Drawings: Indicate components by others. Include full building plan, elevations, sections, details and attachments to other work. Provide anchorage and load criteria shop drawing and calcs for approval by AHJ independently of remainder of shop drawing package.

C. Samples: For units with factory-applied finishes.

D. Delegated-Design Submittal: For metal building roofing replacement systems.

1. Include analysis data indicating compliance with performance requirements and design data signed and sealed by the qualified professional engineer responsible for their preparation.

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1.4 INFORMATIONAL SUBMITTALS

A. Welding certificates.

B. Letter of Design Certification: Signed and sealed by a qualified professional engineer. Include the following:

1. Name and location of Project.

2. Order number.

3. Name of manufacturer.

4. Name of Contractor.

5. Building dimensions including width, length, height, and roof slope.

6. Indicate compliance with AISC standards for hot-rolled steel and AISI standards for cold-rolled steel, including edition dates of each standard.

7. Governing building code and year of edition.

8. Design Loads: Include dead load, roof live load, collateral loads, roof snow load, deflection, wind loads/speeds and exposure, seismic design category or effective peak velocity-related acceleration/peak acceleration, and auxiliary loads (cranes).

9. Load Combinations: Indicate that loads were applied acting simultaneously with concentrated loads, according to governing building code.

10. Building-Use Category: Indicate category of building use and its effect on load importance factors.

C. Material test reports.

D. Sample warranties.

1.5 CLOSEOUT SUBMITTALS

A. Maintenance data.

1.6 QUALITY ASSURANCE

A. Manufacturer Qualifications: A qualified manufacturer.

1. Engineering Responsibility: Preparation of comprehensive engineering analysis and

Shop Drawings by a professional engineer who is legally qualified to practice in jurisdiction where Project is located.

B. Installer Qualifications: An experienced erector who specializes in erecting and installing work similar in material, design, and extent to that indicated for this Project and who is acceptable to roofing panel and roofing insulation manufacturers.

C. Welding Qualifications: Qualify procedures and personnel according to the following:

1. AWS D1.1/D1.1M, "Structural Welding Code - Steel."

2. AWS D1.3, "Structural Welding Code - Sheet Steel."

1.7 WARRANTY

A. Special Warranty on Metal Panel Finishes: Manufacturer agrees to repair finish or replace metal panels that show evidence of deterioration of factory-applied finishes within specified warranty period.

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1. Finish Warranty Period: [20] years from date of Substantial Completion.

B. Special Weathertightness Warranty for Standing-Seam Metal Roof Panels: Manufacturer agrees to repair or replace standing-seam metal roof panel assemblies that leak or otherwise fail to remain weathertight within specified warranty period.

1. Warranty Period: [20] years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Delegated Design: Engage a qualified professional engineer, as defined in Section 01 40 00 "Quality Requirements," to design metal building system.

B. Structural Performance: Metal building systems shall withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated according to procedures in MBMA's "Metal Building Systems Manual."

1. Wind Design Loads: [As indicated on Drawing Sheet A2.20].

2. Snow Design Loads: Ground Snow Load Pg = 30 psf Flat Roof Snow Load Pf = 30 psf minimum Exposure Factor Ce = 1.0 Importance Factor Is = 1.0 Thermal Factor Ct = 1.0

3. Deflection and Drift Limits: Design metal building system assemblies to withstand serviceability design loads without exceeding deflections and drift limits recommended in AISC Steel Design Guide No. 3 "Serviceability Design Considerations for Steel Buildings."

4. Deflection and Drift Limits: No greater than the following:

a. Purlins and Rafters: Vertical deflection of [1/240] of the span.

b. Girts: Horizontal deflection of [1/240] of the span.

c. Metal Roof Panels: Vertical deflection of [1/240] of the span.

d. Metal Wall Panels: Horizontal deflection of [1/240] of the span.

e. Design secondary-framing system to accommodate deflection of primary framing and construction tolerances, and to maintain clearances at openings.

f. Lateral Drift: Maximum of [1/200] of the building height.

C. Seismic Performance: Metal building system shall withstand the effects of earthquake motions determined according to [ASCE/SEI 7] – Seismic Design Category “A”.

D. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes by preventing buckling, opening of joints, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects. Base calculations on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss.

1. Temperature Change: [120 deg F, ambient; 180 deg F, material surfaces].

E. Structural Performance for Metal Roof Panels: Provide metal panel systems capable of withstanding the effects of the following loads, based on testing according to ASTM E1592:

1. Wind Loads: As indicated on Drawing Sheet A2.20.

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F. Air Infiltration for Metal Roof Panels: Air leakage of not more than 0.06 cfm/sq. ft. when tested according to ASTM E1680 at the following test-pressure difference:

1. Test-Pressure Difference: [6.24 lbf/sq. ft.].

G. Water Penetration for Metal Roof Panels: No water penetration when tested according to ASTM E1646 at the following test-pressure difference:

1. Test-Pressure Difference: [12.0 lbf/sq. ft.].

H. Wind-Uplift Resistance: Provide metal roof panel assemblies that comply with UL 580 for wind-uplift-resistance class indicated.

1. Uplift Rating: As indicated on Drawings.

I. Thermal Performance for Opaque Elements: Provide the following maximum U-factors and minimum R-values when tested according to ASTM C1363 or ASTM C518:

1. Roof: As indicated on the drawings (U-Factor: 0.035 maximum).

2.2 MANUFACTURERS

A. Provide factory-formed standing-seam metal roof panels designed to be installed by lapping and interconnecting raised side edges of adjacent panels with joint type indicated and mechanically attaching panels to supports using concealed clips in side laps. Include clips, cleats, pressure plates, and accessories required for weathertight installation.

B. Basis of Design Product: Standing Seam Roofing Panels

1. The design for this product is based on the product by: Nucor Buildings Group: Nucor CFR Standing Seam Roof System or Ceco Double-Lok, gage as required and selected by design/build engineer to meet load and uplift requirements.

a. Mechanically seamed.

b. Exterior Finish: Smooth with [Three-coat fluoropolymer / PVDF].

c. Color: [As selected by Architect from manufacturer's full range].

d. Provide necessary fastener clips.

e. Provide necessary Zee Stand-offs to achieve flush panel installations at existing roof structure offsets (see drawings and existing field conditions).

2. Subject to compliance with requirements, provide either the named product or a comparable approved equal product by one of the following manufacturers:

a. Central States Manufacturing

b. MetlSpan

c. Butler Manufacturing Company.

d. Approved Equal.

C. Basis of Design Product: Roofing Thermal insulation

1. The design for this product is based on the product by: Nucor Buildings Group: Sag -N- Bag (Double Layer).

a. System Thermal Performance = R-30 minimum (U= 0.035 maximum)

b. Exposed Vapor Barrier Facing: Required Fall Protection Grade

c. Thermal Blocking: Required.

2. Subject to compliance with requirements, provide either the named product or a comparable approved equal product by one of the following manufacturers:

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a. Butler Manufacturing Company.

b. Approved Equal.

2.3 THERMAL INSULATION

A. Faced Metal Building Insulation: ASTM C991, Type II, glass-fiber-blanket insulation; 0.5-lb/cu.

ft. density; 2-inch- wide, continuous, vapor-tight edge tabs; with a flame-spread index of 25 or less.

B. Unfaced Metal Building Insulation: ASTM C991, Type I, or NAIMA 202, glass-fiber-blanket insulation; 0.5-lb/cu. ft. density; 2-inch- wide, continuous, vapor-tight edge tabs; with a flame-spread index of 25 or less.

C. Retainer Strips: For securing insulation between supports, 0.025-inch nominal-thickness, formed, metallic-coated steel or PVC retainer clips colored to match insulation facing.

D. Vapor-Retarder Facing: ASTM C1136, with permeance not greater than 0.02 perm when tested according to ASTM E96/E96M, Desiccant Method.

2.4 ACCESSORIES AND MISCELLANEOUS MATERIALS

A. General: Provide accessories as standard with metal building system manufacturer and/or as specified to facilitate proper and code compliant installation of the Standing Seam Metal Roofing and Thermal Insulation Systems. Fabricate and finish accessories at the factory to greatest extent possible, by manufacturer's standard procedures and processes. Comply with indicated profiles and with dimensional and structural requirements.

B. Panel Accessories: Provide components required for a complete, weathertight panel system including trim, copings, fasciae, mullions, sills, corner units, clips, flashings, sealants, gaskets, fillers, closure strips, pipe penetration flashings, and similar items. Match material and finish of metal panels unless otherwise indicated.

C. Panel Sealants: Provide sealant type recommended by manufacturer that are compatible with panel materials, are nonstaining, and do not damage panel finish.

1. Sealant Tape: Pressure-sensitive, 100 percent solids, gray polyisobutylene compound sealant tape with release-paper backing;

2. Joint Sealant: ASTM C920; as recommended in writing by metal panel manufacturer.

3. Butyl-Rubber-Based, Solvent-Release Sealant: ASTM C1311.

D. Miscellaneous Metal Subframing and Furring: ASTM C645; cold-formed, metallic-coated steel sheet, ASTM A653/A653M, G90 coating designation or ASTM A792/A792M, Class AZ50 coating designation unless otherwise indicated. Provide manufacturer's standard sections as required for support and alignment of metal panel system.

E. Fasteners: Self-tapping screws, self-locking rivets and bolts, and other suitable fasteners designed and selected to withstand design loads.

1. General:

a. Exposed Fasteners: Heads matching color of sheet metal roofing, using plastic caps or factory-applied coating. Provide metal-backed EPDM or PVC sealing washers under heads of exposed fasteners bearing on weather side of roofing.

METAL BUILDING ROOFING AND THERMAL INSULATION REPLACEMENT SYSTEMS 13 34 19.01 - 6

b. Fasteners for Flashing and Trim: Blind fasteners or self-drilling screws, gasketed;

with hex-washer head.

c. Blind Fasteners: High-strength aluminum or stainless steel rivets suitable for metal being fastened.

2. Fasteners for Zinc-Coated (Galvanized) and Aluminum-Zinc Alloy-Coated Steel Sheet: Series 300 stainless steel or hot-dip galvanized steel according to ASTM A153/A153M or ASTM F2329 as recommended by manufacturer.

F. Thermal Blocking: Provide thermal blocking meeting fastener requirements to assure proper installation of the metal roofing

G. "Snow Guards": Plastic type, polycarbonate, designed for attachment to roof surface using silicone or polyurethane elastomeric sealant or adhesive tape, as recommended by manufacturer. To replace existing where they occur.

1. Basis of Design: SnoBlox ACE by SnoBlox-SnoJax or approved equal.

H. Gutters and Downspouts: Contractor’s Option to provide roofing manufacturer’s gutter assemblies, or meet requirements of Section 07 62 00 Sheet metal Flashing and Trim. Align gutters to utilize existing downspouts, modified as necessary to connect to gutters.

PART 3 - EXECUTION

3.1 THERMAL INSULATION INSTALLATION

A. General: Install insulation concurrently with metal panel installation, in thickness indicated to cover entire surface, according to manufacturer's written instructions.

1. Set vapor-retarder-faced units with vapor retarder toward warm side of construction unless otherwise indicated. Do not obstruct ventilation spaces except for firestopping.

2. Tape joints and ruptures in vapor retarder, and seal each continuous area of insulation to the surrounding construction to ensure airtight installation.

3. Install factory-laminated, vapor-retarder-faced blankets straight and true in one-piece lengths, with both sets of facing tabs sealed, to provide a complete vapor retarder.

4. Install blankets straight and true in one-piece lengths. Install vapor retarder over insulation, with both sets of facing tabs sealed, to provide a complete vapor retarder.

B. Blanket Roof Insulation: Comply with the following installation method:

1. Over-Purlin-with-Spacer-Block Installation: Extend insulation and vapor retarder over and perpendicular to top flange of secondary framing. Install layer of filler insulation over first layer to fill space formed by metal roof panel standoffs. Hold in place by panels fastened to standoffs.

a. Thermal Spacer Blocks: Where metal roof panels attach directly to purlins, install thermal spacer blocks.

2. Retainer Strips: Where required by insulation mfr, install retainer strips at each longitudinal insulation joint, straight and taut, nesting with secondary framing to hold insulation in place.

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3.2 METAL ROOF PANEL INSTALLATION

A. General: Provide metal roof panels of full length from eave to ridge unless otherwise indicated or restricted by shipping limitations.

1. Install ridge and peak caps as metal roof panel work proceeds.

2. Flash and seal metal roof panels with weather closures at eaves and rakes. Fasten with self-tapping screws.

B. Standing-Seam Metal Roof Panels: Fasten metal roof panels to supports with concealed clips at each standing-seam joint, at location and spacing and with fasteners recommended by manufacturer.

1. Install clips to supports with self-drilling or self-tapping fasteners.

2. Install pressure plates at locations indicated in manufacturer's written installation instructions.

3. Snap Joint: Nest standing seams and fasten together by interlocking and completely engaging factory-applied sealant.

4. Seamed Joint: Crimp standing seams with manufacturer-approved motorized seamer tool so that clip, metal roof panel, and factory-applied sealant are completely engaged.

5. Rigidly fasten eave end of metal roof panels and allow ridge end free movement for thermal expansion and contraction. Predrill panels for fasteners.

6. Achieve watertight installation, applying sealant or tape to seal joints and between panels and at protrusions and accessories as recommended by the panel manufacturer.

7. Provide metal closures at peaks, rake edges, rake walls, and each side of ridge caps.

C. Metal Fascia Panels: Align bottom of metal panels and fasten with blind rivets, bolts, or self-drilling or self-tapping screws. Flash and seal metal panels with weather closures where fasciae meet soffits, along lower panel edges, and at perimeter of all openings.

3.3 ACCESSORY INSTALLATION

A. General: Install accessories with positive anchorage to building and weathertight mounting, and provide for thermal expansion. Coordinate installation with flashings and other components.

1. Install components required for a complete metal roof panel assembly, including trim, copings, ridge closures, seam covers, flashings, sealants, gaskets, fillers, closure strips, and similar items.

2. Install components for a complete metal wall panel assembly, including trim, copings, corners, seam covers, flashings, sealants, gaskets, fillers, closure strips, and similar items.

3. Where dissimilar metals contact each other or corrosive substrates, protect against galvanic action by painting contact surfaces with corrosion-resistant coating, by applying rubberized-asphalt underlayment to each contact surface, or by other permanent separation as recommended by manufacturer.

B. Flashing and Trim: Comply with performance requirements, manufacturer's written installation instructions, and SMACNA's "Architectural Sheet Metal Manual." Provide concealed fasteners where possible, and set units true to line and level. Install work with laps, joints, and seams that will be permanently watertight and weather resistant.

1. Install exposed flashing and trim that is without excessive oil-canning, buckling, and tool marks and that is true to line and levels indicated, with exposed edges folded back to

METAL BUILDING ROOFING AND THERMAL INSULATION REPLACEMENT SYSTEMS 13 34 19.01 - 8 form hems. Install sheet metal flashing and trim to fit substrates and to result in waterproof and weather-resistant performance.

2. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. Space movement joints at a maximum of 10 feet with no joints allowed within 24 inches of corner or intersection. Where lapped or bayonet-type expansion provisions cannot be used or would not be sufficiently weather resistant and waterproof, form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with mastic sealant (concealed within joints).

C. Gutters: Join sections with riveted-and-soldered or lapped-and-sealed joints. Attach gutters to eave with gutter hangers spaced as required for gutter size, but not more than 36 inches o.c.

using manufacturer's standard fasteners. Provide end closures and seal watertight with sealant.

Provide for thermal expansion.

D. Downspouts: Join sections with 1-1/2-inch telescoping joints. Provide fasteners designed to hold downspouts securely 1 inch away from walls; locate fasteners at top and bottom and at approximately 60 inches o.c. in between. Modify existing downspout assemblies to connect to new gutters as required for watertight installation.

3.4 CLEANING AND PROTECTION

A. Maintain sheet metal roofing in clean condition during construction.

B. On completion of sheet metal roofing installation, clean finished surfaces as recommended by sheet metal roofing manufacturer.

C. Clean off excess sealants.

D. Remove temporary protective coverings and strippable films as sheet metal roofing is installed unless otherwise indicated in manufacturer's written installation instructions.

E. Replace sheet metal roofing components that have been damaged or have deteriorated beyond successful repair by finish touchup or similar minor repair procedures, as determined by Architect.

F. Repair damaged insulation vapor barriers or other products as per manufacturer's written instructions. Replace damaged products that are aesthetically not acceptable to the Owner or Architect.

END OF SECTION 13 34 19.01