Attachment_2_Specifications.pdf

RFO Warehouse Re-roof & Re-siding Preparation for Re-Roofing March 26, 2021 070150-1

SECTION 070150 - PREPARATION FOR RE-ROOFING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Roof re-cover preparation, sheathing and insulation.

1.2 ACTION SUBMITTALS

A. Product Data: For each type of product indicated.

B. Temporary Roofing: Include Product Data and description of temporary roofing system if used.

C. Fastener Pull-Out Test Results: Provide fastener/substrate test results as required to determine sheathing fastening patterns.

D. Delegated-Design Submittal: For sheathing fastening patterns, include analysis reports signed and sealed by the qualified professional engineer responsible for their preparation.

E. Shop Drawings: Fastening patterns of sheathing and insulation.

1.3 INFORMATIONAL SUBMITTALS

A. Qualification Data: For professional engineer's experience with providing delegated design engineering services of the kind indicated, including documentation that the engineer is licensed in the state in which the Project is located.

B. Photographs: Show existing conditions of adjoining construction and site improvements, including exterior and interior finish surfaces that might be misconstrued as having been damaged by reroofing operations. Submit before Work begins.

1.4 QUALITY ASSURANCE

A. Reroofing Conference: Conduct conference at Project Site.

1. Meet with Contracting Officer; inspecting agency representative; roofing system manufacturer's representative; deck Installer; roofing Installer including project manager, superintendent, and foreman; and installers whose work interfaces with or affects reroofing including installers of roof accessories and roof-mounted equipment.

2. Review methods and procedures related to roofing system replacement including, but not limited to, the following:

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a. Reroofing preparation, including roofing system manufacturer's written instructions.

b. Construction schedule, sequence of work and availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

c. Structural loading limitations of deck during reroofing.

d. Base flashings, special roofing details, drainage, penetrations, equipment curbs, and condition of other construction that will affect reroofing.

e. Governing regulations and requirements for insurance and certificates if applicable.

f. Existing conditions that may require notification of Contracting Officer before proceeding.

1.5 PROJECT CONDITIONS

A. Government will occupy portions of building immediately adjacent to reroofing areas. Conduct re-roofing so Government operations will be disrupted as little as possible. Provide Contracting Officer with not less than 72 hours’ notice of activities that may affect Government operations.

1. Coordinate work activities daily with Contracting Officer. Follow the roof replacement sequencing agreed to in the reroofing conference.

2. Before working over roof areas, notify occupants below the affected area.

3. Verify that occupants below the work area have been evacuated before proceeding with work over a given area.

B. Protect building to be re-roofed, adjacent buildings, walkways, site improvements, exterior plantings, and landscaping from damage or soiling from re-roofing operations.

C. Limit construction loads on roof to 20 psf for uniformly distributed loads.

D. Weather Limitations: Proceed with re-roofing preparation only when existing and forecasted weather conditions permit Work to proceed without water entering existing roofing system or building.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Fastener Pull-Out Test: Perform fastener pull-out tests on the existing metal roofs as required to determine sheathing fastening patterns for both upper and lower layers of sheathing.

B. Delegated Design: Engage a qualified professional engineer to design fastening patterns for both upper and lower layers of sheathing based on fastener pull-out test on the existing metal roofs.

2.2 AUXILIARY REROOFING MATERIALS

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A. General: Auxiliary reroofing preparation materials recommended by roofing system manufacturer for intended use.

2.3 SHEATHING

A. CDX Plywood, 5/8-inch thick (C side out), smooth-surfaced exterior grade plywood with exterior grade glue to cover the existing metal roof, and to cover the new rigid foam insulation as a substrate to attach the new standing seam metal roof.

2.4 AIR BARRIER

A. Self-Adhering, High-Temperature Sheet: Minimum 30 mils thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl rubber adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing. Provide primer according to written recommendations of underlayment manufacturer.

1. Products: Subject to compliance with requirements, provide the following:

a. Grace Ice and Water Shield Ultra by Grace Construction Products, a unit of W. R.

Grace & Co., or approved equal.

2. Thermal Stability: ASTM D 1970; stable after testing at 280 deg F or higher.

3. Low-Temperature Flexibility: ASTM D 1970; passes after testing at minus 20 deg F or lower.

2.5 INSULATION

A. Foam board insulation shall be one layer of 2-inch minimum thickness extruded polystyrene (XPS) over two layers of 2-inch minimum thickness polyisocyanurate (polyiso) for a total minimum thickness of 6 inches and have an average roof R-Value of 34.

B. Polyisocyanurate Board Insulation (Polyiso): Rigid, cellular polyisocyanurate thermal insulation with core formed by using blowing agents to comply with ASTM C1289-02 with Type I, Class 1 or 2, foil faced on both surfaces. Boards shall be 4 feet by 8 feet and meet or exceed the following requirements:

1. R-Value (Long Term Thermal Resistance) (CAN/ULC S770) – 6.0 min. per inch.

2. Compressive strength in thickness direction (ASTM D1621) – Grade 2 - 20 PSI minimum.

3. Dimensional stability (ASTM D2126) – less than 2% change in 7 days.

4. Moisture vapor transmission (ASTM E96) – less than 1.0 perm.

C. Extruded Polystyrene Board (XPS): ASTM C578, Type VI; unfaced; maximum flame-spread and smoke-developed indexes of 10 and 175, respectively, per ASTM E84. Boards shall be 4 feet by 8 feet and meet or exceed the following requirements.

1. R-Value (Long Term Thermal Resistance) (CAN/ULC S770) – 5.0 min. per inch.

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2. Compressive strength in thickness direction (ASTM D1621) – 40 PSI minimum.

3. Dimensional stability (ASTM D2126) – less than 2% change in 7 days.

4. Moisture vapor transmission (ASTM E96) – less than 1.1 perm.

5. Manufactured with polystyrene resin and a blend of HFO and HFC blowing agents that have a global warming potential (100 year) of less than 80 (vs. 750 for standard XPS).

6. Owens Corning Foamular NGX 400, or approved equal.

D. Spray Foam Insulation: Polyurethane-based high density insulating foam sealant with high flexibility to withstand building material movement and UV resistance without becoming brittle.

Service Temperature: -40°F to 194°F. Loctite Titefoam Gaps & Cracks, or approved equal.

2.6 FASTENERS AND ANCHORS

A. Lower Sheathing to Existing Metal Roof: SAE C1022 heat treated steel with epoxy coating, engineered to secure sheathing to corrugated steel. Trufast #12 DP roofing fasteners, or approved equal.

B. Upper Sheathing and Insulation to Lower Sheathing and Existing Metal Roof: Case hardened and tempered carbon steel with epoxy coating, engineered to secure sheathing to corrugated steel and wood substrates. Trufast SIP LD roofing fasteners, or approved equal.

2.7 INSULATION TAPE

A. Tape for Polyisocyanurate Board Insulation (Polyiso): 3 mils thick, 1.9 inch wide construction seaming tape with polypropylene backing, acrylic adhesive and UV resistance. Service temperature range -40° to 240°F. 3M Construction Seaming Tape 8087CW, or approved equal.

B. Tape for Extruded Polystyrene Board (XPS): 9.9 mils thick, 3 inch wide high tack acrylic adhesive with adhesion type rating Type A. Service temperature range -40 to 240 °F. 3M All Weather Flashing Tape 8067, or approved equal.

PART 3 - EXECUTION

3.1 SURFACE INSPECTION AND PREPARATION

A. Before commencing work, all surfaces shall be smooth, clean, dry, free of debris, flaws, sharp edges, loose and foreign material, oil and grease, and other substances detrimental to roofing installation according to roofing system manufacturer’s written instructions. All roof surfaces shall be free of water, ice, dew and snow. Verify that rooftop utilities and service piping have been shut off before beginning the Work.

3.2 TEMPORARY ROOFING SHEETING

A. Install approved temporary roofing sheeting over intermediate area between new work and existing roofing.

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3.3 EXISTING FLASHINGS

A. Remove existing base flashings around walls and penetrations.

1. Clean substrates of contaminants such as asphalt, sheet materials, dirt, and debris.

B. Do not damage metal counter flashings that are to remain. Replace metal counter flashings damaged during removal with counter flashings of same metal thickness and finish unless specified elsewhere.

3.4 DISPOSAL

A. Collect and place demolished materials in containers. Promptly dispose of demolished materials. Do not allow demolished materials to accumulate on-site.

B. Transport and legally dispose of demolished materials off Owner's property.

3.5 INSTALLATION (GENERAL)

A. Perform roofing work on a continuous basis as surface and weather conditions allow.

B. Protect adjoining surfaces against any damage that could result from roofing installation.

C. Install only as much roofing as can be completed in one day. If weather conditions do not permit such completion, exposed areas shall be temporary weatherproofed to prevent any water or snow infiltration from damaging insulation or other materials already installed.

D. If any water is allowed to enter under the newly completed roofing, the affected area shall be removed and replaced at the Contractor’s expense.

3.6 SHEATHING

A. Install 5/8-inch CDX (C side out), smooth-surfaced exterior grade plywood sheathing with exterior grade glue to cover the existing metal roof, and to cover the new rigid foam insulation as a substrate to attach the new standing seam metal roof.

B. Secure sheathing to substrate (existing metal roof for lower sheathing, existing metal roof and lower sheathing for upper sheathing) with threaded mechanical fasteners (screws). Fastening patterns shall be as determined by a qualified professional engineer as indicated in Delegated Design above. Fasteners shall be long enough to penetrate substrate (existing metal roof) by at least 1½-inch and shall be approved for such use by the fastener manufacturer. Use fastener tool with a depth locator and torque-limiting attachment to ensure proper installation.

3.7 AIR BARRIER

A. Install air barrier / vapor retarder on new plywood sheathing in accordance with manufacturer’s written instructions. Prime wood sheathing the same day as installation of air barrier. Lay out

March 26, 2021 070150-6 sheets so side laps overlap by 3-inches and end laps overlap by 6-inches. Peel back release liner, press onto substrate, and roll with a minimum 100 lb. roller. Seal around any penetrations through the air control layer.

3.8 SPRAY FOAM INSULATION

A. Install spray foam insulation in all gaps at exposed edges of existing metal roof at eaves and rakes.

Install in gaps above existing metal roof (between existing metal roof and new plywood sheathing) and in gaps below existing metal roof (between existing metal roof and existing building). Fill entire width of each gap a minimum of 4-inches deep with spray foam.

3.9 FOAM BOARD INSULATION

A. Apply only as much insulation to the roof as can be covered the same day on the onset of inclement weather with roof membrane. Cut insulation to fit tight between projections and around penetrations. Tightly butt ends of adjacent insulation pieces together. Install no insulation less than 12 inches square. At the conclusion of each day’s work, seal exposed edges of the insulation.

Cut and remove seal upon continuation of the work.

B. Install required thickness in 3 layers with joints of each succeeding layer staggered from joints of previous layer a minimum of 12 inches in each direction.

C. Install 4-feet by 8-feet boards in a continuous straight line with end joints staggered a minimum of 12 inches between rows, abutting edges and end between boards. Fill gaps exceeding ¼-inch with insulation. Cut and fit insulation within ¼-inch of nailers, projections and penetrations.

D. Provide a smooth surface at upper sheathing butt joints not exceeding 1/8-inch to accept the upper sheathing.

E. Insulation shall be mechanically fastened to the substrate to prevent damage until upper sheathing is installed. Use long screws equipped with washers or roofing buttons.

3.10 VENTS (STACKS)

A. Extend all vent stacks a minimum of 12 inches above roof level. All vent flashings shall extend a minimum of 8 inches above roof level unless otherwise accepted by the Contracting Officer and roofing system manufacturer. Use pre-molded stack flashing at all vent, duct and flue pipes.

3.11 PROTECTION

A. Provide traffic ways, erect barriers, fences, guards, rails enclosures, chutes and the like to protect personnel, roofs and structures.

END OF SECTION 070150

RFO Warehouse Re-roof & Re-siding Steel Siding March 26, 2021 074619-1

SECTION 074619 - STEEL SIDING

PART 1 - GENERAL

1.1 SUMMARY

A. Section includes steel siding.

1.2 COORDINATION

A. Coordinate siding installation with flashings and other adjoining construction to ensure proper sequencing.

1.3 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at project site.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of product. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes.

B. Samples for Initial Selection: For steel siding including related accessories.

C. Samples for Verification: For each type, color, texture, and pattern required.

1. 12-inch-long-by-actual-width Sample of siding.

1.5 INFORMATIONAL SUBMITTALS

A. Product Certificates: For each type of steel siding.

B. Sample Warranty: For special warranty.

1.6 CLOSEOUT SUBMITTALS

A. Maintenance Data: For each type of product, including related accessories, to include in maintenance manuals.

1.7 MAINTENANCE MATERIAL SUBMITTALS

A. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

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1. Furnish full lengths of steel siding including related accessories, in a quantity equal to 2 percent of amount installed.

1.8 QUALITY ASSURANCE

A. Mockups: Build mockups to verify selections made under Sample submittals and to demonstrate aesthetic effects and to set quality standards for fabrication and installation.

1. Build mockups for siding including accessories.

a. Size: 48 inches long by 60 inches high.

b. Include outside corner on one end of mockup.

2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Contracting Officer specifically approves such deviations in writing.

3. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.9 DELIVERY, STORAGE, AND HANDLING

A. Deliver and store packaged materials in original containers with labels intact until time of use.

B. Store materials on elevated platforms, under cover, and in a dry location.

1.10 WARRANTY

A. Special Warranty: Manufacturer agrees to repair or replace products that fail in materials or workmanship within specified warranty period.

1. Failures include, but are not limited to, the following:

a. Structural failures including cracking and deforming.

b. Hail damage, including denting.

c. Deterioration of metals and other materials beyond normal weathering.

d. Deterioration of metal finishes, including chalking and fading.

2. Fading is defined as loss of color, after cleaning with product recommended by manufacturer, of more than 5 Hunter color-difference units as measured according to

ASTM D2244.

3. Warranty Period: 25 years from date of Substantial Completion.

4. Warranty Period for Chalking and Fading: 15 years from date of Substantial Completion.

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PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Source Limitations: Obtain products, including related accessories, from single source from single manufacturer.

2.2 STEEL SIDING

A. Steel Siding: Formed product, in continuous lengths without end joints, made from galvanized steel complying with ASTM A653/A653M, G90 (Z275) coating.

B. Vertical Pattern: 12-inch exposure in board-and-batten, single-board style.

C. Texture: Smooth.

D. Nominal Thickness: 0.019 inch (0.5 mm).

E. Finish: Manufacturer's standard Kynar PVDF coating (polyvinylidene fluoride).

1. Colors: As selected by Contracting Officer from manufacturer's full range of colors.

2.3 ACCESSORIES

A. Decorative Accessories: Provide the following steel decorative accessories as indicated:

1. Corner posts.

2. Door and window casings.

3. Fasciae.

4. Moldings and trim.

B. Colors for Decorative Accessories: As selected by Contracting Officer from manufacturer's full range of colors.

C. Flashing: Provide flashing complying with Section 076200 "Sheet Metal Flashing and Trim" at window and door heads and where indicated.

D. Fasteners:

1. For fastening to wood, use ribbed bugle-head screws of sufficient length to penetrate a minimum of 1 inch into substrate.

2. For fastening to metal, use ribbed bugle-head screws of sufficient length to penetrate a minimum of 1/4 inch, or three screw-threads, into substrate.

3. For fastening galvanized steel, use hot-dip galvanized-steel fasteners. Where fasteners are exposed to view, use prefinished galvanized-steel fasteners in color to match item being fastened.

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PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates for compliance with requirements for installation tolerances and other conditions affecting performance of steel siding and related accessories.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Clean substrates of projections and substances detrimental to application.

3.3 INSTALLATION

A. General: Comply with manufacturer's written installation instructions applicable to products and applications indicated unless more stringent requirements apply.

1. Center nails in elongated nailing slots without binding siding to allow for thermal movement.

B. Install joint sealants as specified in Section 079200 "Joint Sealants" and to produce a weathertight installation.

C. Where steel siding contacts dissimilar metals, protect against galvanic action by painting contact surfaces with primer or by applying sealant or tape or installing nonconductive spacers as recommended by manufacturer for this purpose.

3.4 ADJUSTING AND CLEANING

A. Remove damaged, improperly installed, or otherwise defective materials and replace with new materials complying with specified requirements.

B. Clean finished surfaces according to manufacturer's written instructions and maintain in a clean condition during construction.

END OF SECTION 074619

RFO Warehouse Re-roof & Re-siding Sheet Metal Roofing March 26, 2021 076100-1

SECTION 076100 - SHEET METAL ROOFING

A. Section includes custom-fabricated, standing-seam sheet metal roofing applied over sheathing.

B. Color shall be selected by the Contracting Officer from color swatches provided by the contractor.

1.2 RELATED SECTIONS

A. Section 070150 - Preparation for Re-Roofing.

B. Section 077100 - Roof Specialties.

C. Section 077253 - Snow Guards.

1.3 PREINSTALLATION MEETINGS

A. Pre-installation Conference: Conduct conference at Project site.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Shop Drawings: For sheet metal roofing.

1. Include roof plans, sections, details and attachments to other work, for the following:

a. Base flashings, roof penetrations, and equipment curbs.

b. Fastening patterns of roof panels.

c. Ridges, crickets, and saddles.

d. Manufacturer’s standard details as necessary to suit project requirements.

2. Show installation layouts, expansion joint locations, fixed points, and keyed details.

Distinguish between shop- and field-assembled work.

3. Include pattern of seams and details of termination points, expansion joints, direction of expansion, roof penetrations, edge conditions, special conditions, and connections to adjoining work.

C. Samples: For each exposed product and for each color and texture specified.

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1.5 INFORMATIONAL SUBMITTALS

A. Product test reports.

B. Sample warranties.

1.6 CLOSEOUT SUBMITTALS

A. Maintenance data.

B. Warranties.

1.7 QUALITY ASSURANCE

A. Mockups: Build mockups to set quality standards for fabrication and installation, and to demonstrate aesthetic effects of sample submittals.

1. Build mockup of typical roof area and eave as shown on Sketch, including underlayment, attachments, and accessories.

a. Size: Approximately 6 feet square.

1.8 WARRANTY

A. Warranty: Furnish a written 30 year minimum warranty from date of substantial completion on roofing materials and a 5 year guarantee against a defective roofing system, including any repairs necessary to maintain a watertight condition.

1. Coating Warranty: Coating Applicator’s warranty in which Applicator agrees to repair finish or replace coated items that demonstrate deterioration of shop-applied finishes within warranty period indicated.

2. Exposed Coating: Deterioration includes but is not limited to:

a. Color fading in excess of 5 Delta E Hunter units per ASTM D 2244.

b. Peeling, checking, or cracking of coating adhesion to metal.

c. Chalking in excess of a No. 8 per ASTM D 4214, when tested per Method D 659.

d. Corrosion of substrate in excess of a No. 6 on cut edges and a No. 8 on field surfaces, when measured per ASTM D 1654.

2.1 PERFORMANCE REQUIREMENTS

A. General Performance: Sheet metal roofing system including, but not limited to, metal roof panels, cleats, anchors and fasteners, sheet metal flashing integral with sheet metal roofing, fascia panels, March 26, 2021 076100-3 trim, underlayment, and accessories, shall comply with requirements without failure due to defective manufacture, fabrication, or installation, or due to other defects in construction. Sheet metal roofing shall remain watertight.

B. Sheet Metal Roofing Standard: Comply with SMACNA's "Architectural Sheet Metal Manual" unless more stringent requirements are specified.

C. Recycled Content of Steel-Sheet Roofing: Postconsumer recycled content plus one-half of pre-consumer recycled content not less than 25 percent.

D. Solar Reflective Index (SRI): Provide metal roof panel coatings with an initial SRI of not less than 82 or a 3-year aged SRI of 64 for slopes of 2:12 or less, and an initial SRI of 39 or a 3-year aged SRI of 32 for slopes greater than 2:12, per ASTM E 1980.

E. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes.

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

2.2 ROOFING SHEET METALS

A. General: Protect mechanical and other finishes on exposed surfaces from damage by applying strippable, temporary protective film before shipping.

B. Metallic-Coated Steel Sheet: Provide zinc-coated (galvanized) steel sheet according to ASTM

A 653/A 653M, G90 (Z275) coating designation with smooth surface; pre-painted by coil-coating process to comply with ASTM A 755/A 755M.

1. Thickness: Nominal 24 gage unless otherwise indicated.

2. Length: Panels shall be continuous from eave or valley to ridge.

3. Exposed Coil-Coated Finish:

a. Three-Coat Fluoropolymer: AAMA 621. Fluoropolymer finish containing not less than 70 percent PVDF resin by weight in both color coat and clear topcoat. Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions.

4. Color: As selected by Contracting Officer from manufacturer's list of colors that meet SRI requirements indicated above.

2.3 UNDERLAYMENT MATERIALS

A. Self-Adhering, High-Temperature Sheet: Minimum 30 mils thick, consisting of a slip-resistant polyethylene- or polypropylene-film top surface laminated to a layer of butyl rubber adhesive, with release-paper backing; specifically designed to withstand high metal temperatures beneath metal roofing. Provide primer according to written recommendations of underlayment manufacturer.

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1. Products: Subject to compliance with requirements, provide the following:

a. Grace Ice and Water Shield Ultra by Grace Construction Products, a unit of W. R.

Grace & Co., or approved equal.

2. Thermal Stability: ASTM D 1970; stable after testing at 280 deg F or higher.

3. Low-Temperature Flexibility: ASTM D 1970; passes after testing at minus 20 deg F or lower.

B. Slip Sheet: Rosin-sized building paper, 3 lb./100 sq. ft. minimum.

2.4 MISCELLANEOUS MATERIALS

A. General: Provide materials and types of fasteners, solder, protective coatings, sealants, and other miscellaneous items as required for complete roofing system and as recommended by primary sheet metal manufacturer unless otherwise indicated.

B. Fasteners: Wood screws, annular-threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners designed 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.

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) Steel Sheet: Series 300 stainless steel or hot-dip galvanized steel according to ASTM A 153/A 153M or ASTM F 2329.

C. Sealant Tape: Pressure-sensitive, 100 percent solids, polyisobutylene compound sealant tape with release-paper backing. Provide permanently elastic, non-sag, nontoxic, non-staining tape 1/2 inch wide and 1/8 inch thick.

D. Elastomeric Sealant: ASTM C 920, elastomeric polyurethane polymer sealant; of type, grade, class, and use classifications required to seal joints in sheet metal roofing and remain watertight.

E. Butyl Sealant: ASTM C 1311, single-component, solvent-release butyl rubber sealant;

polyisobutylene plasticized; heavy bodied for hooked-type expansion joints with limited movement.

F. Bituminous Coating: Cold-applied asphalt emulsion according to ASTM D 1187.

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2.5 ACCESSORIES

A. Sheet Metal Accessories: Provide components required for complete sheet metal roofing assembly including trim, copings, fasciae, corner units, clips, flashings, sealants, gaskets, fillers, metal closures, closure strips, and similar items. Match material and finish of sheet metal roofing unless otherwise indicated.

1. Cleats: Intermittent and continuous attachment devices for mechanically seaming into joints and formed from the following materials and thicknesses unless otherwise indicated:

a. Metallic-Coated Steel Roofing: 0.0250-inch-thick stainless steel.

2. Expansion-Type Cleats: Cleats of a design that allows longitudinal movement of roof panels without stressing panel seams; of same material as other cleats.

3. Backing Plates: Plates at roofing splices, fabricated from material recommended by

SMACNA.

4. Closure Strips: Closed-cell, expanded, cellular, rubber or cross-linked, polyolefin foam or closed-cell laminated polyethylene; minimum 1-inch-thick, flexible-closure strips; cut or pre-molded to match sheet metal roofing profile. Provide closure strips where necessary to ensure weather-tight construction.

5. Flashing and Trim: Formed from same material and with same finish as sheet metal roofing, minimum 0.018 inch thick.

B. Roof Curbs: Fabricated from same material and finish as sheet metal roofing, minimum thickness matching the sheet metal roofing; with bottom of skirt profiled to match roof panel and seam profiles; with weatherproof top box and integral full-length cricket. Fabricate curb sub-framing of nominal 0.062-inch-thick, angle, C- or Z-shaped, galvanized-steel or stainless-steel sheet.

Fabricate curb and sub-framing to withstand loads of existing equipment.

2.6 FABRICATION

A. General: Custom fabricate sheet metal roofing to comply with details shown and recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions (panel width and seam height), geometry, metal thickness, and other characteristics of installation. Fabricate sheet metal roofing and accessories in shop to greatest extent possible.

1. Standing-Seam Roofing: Form standing-seam panels with finished seam height 1-1/2 inches.

B. Form exposed sheet metal work to fit substrates with little oil canning; free of buckling and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

1. Form and fabricate sheets, seams, strips, cleats, valleys, ridges, edge treatments, integral flashings, and other components of metal roofing to profiles, patterns, and drainage arrangements as required for leakproof construction.

C. Sheet Metal Accessories: Custom fabricate flashings and trim to comply with recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions, metal, and other characteristics of item required. Obtain field measurements for accurate fit before shop fabrication.

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3.1 EXAMINATION AND PREPARATION

A. Examine solid roof sheathing to verify that sheathing joints are supported by insulation and that tops of fasteners are flush with surface.

3.2 UNDERLAYMENT INSTALLATION

A. Underlayment Locations and Types:

1. Apply Self-Adhering Underlayment at all surfaces.

2. Apply slip sheet as recommended by metal roofing manufacturer.

B. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle free.

Prime substrate if recommended by underlayment manufacturer. Comply with temperature restrictions of underlayment manufacturer for installation; use primer for installing underlayment at low temperatures. Apply in shingle fashion to shed water, with end laps of not less than 6 inches staggered 24 inches between courses. Overlap side edges not less than 3-1/2 inches. Roll laps and edges with roller. Cover underlayment within 14 days.

C. Apply slip sheet, wrinkle free, before installing sheet metal roofing and related flashing.

3.3 INSTALLATION, GENERAL

A. General: Install sheet metal roofing to comply with details shown and recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to installation characteristics required. Install fasteners, solder, protective coatings, separators, sealants, and other miscellaneous items as required for complete roofing system and as recommended by fabricator for sheet metal roofing.

1. Install sheet metal roofing true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant.

2. Anchor sheet metal roofing and other components of the Work securely in place, with provisions for thermal and structural movement.

3. Field cutting of sheet metal roofing by torch is not permitted.

4. Provide metal closures at rake edges, eaves and each side of ridge caps.

5. Flash and seal sheet metal roofing with closure strips at eaves, rakes, and perimeter of all openings. Fasten with self-tapping screws.

6. Locate and space fastenings in uniform vertical and horizontal alignment. Predrill panels for fasteners.

7. Install ridge caps as sheet metal roofing work proceeds.

8. Locate roofing splices over, but not attached to, structural supports. Stagger roofing splices and end laps to avoid four-panel lap splice condition. Install backing plates at roofing splices.

9. Lap metal flashing over sheet metal roofing to direct moisture to run over and off roofing.

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B. Thermal Movement: Rigidly fasten metal roof panels to structure at only one location for each panel. Allow remainder of panel to move freely for thermal expansion and contraction.

1. Point of Fixity: Fasten each panel along single line of fixing located at center of panel length.

2. Avoid attaching accessories through roof panels in manner that inhibits thermal movement.

C. Fasteners: Use fastener sizes that penetrate substrate not less than recommended by fastener manufacturer to achieve maximum pull-out resistance.

D. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating, by applying self-adhering sheet underlayment to each contact surface, or by other permanent separation as recommended by sheet metal manufacturer or SMACNA.

1. Coat concealed side of sheet metal roofing with bituminous coating where roofing contacts wood, ferrous metal, or cementitious construction.

E. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation.

3.4 CUSTOM-FABRICATED SHEET METAL ROOFING INSTALLATION

A. Standing-Seam Roofing: Attach standing-seam metal panels to substrate with double-fastened cleats spaced as recommended by manufacturer. Install continuous panels reaching from eave to ridge before moving to adjacent panels. Before panels are interlocked, apply continuous bead of sealant to top of flange of lower panel. Lock standing seams by folding over twice so cleat and panel edges are completely engaged.

1. Lock each panel to panel below with sealed transverse seam.

2. Fold over seams after locking at ridges and hips as recommended by manufacturer.

3.5 ACCESSORY INSTALLATION

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

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

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 install units true to line, levels, and slopes. Install work with laps, joints, and seams that are permanently watertight and weather resistant

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3.6 CLEANING AND PROTECTION

A. Clean off excess sealants.

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

3.7 FIELD CONTROL

A. Arrange for a final roof inspection with a certified roof inspector to inspect the roofing installation in the presence of the Contracting Officer’s Representative and submit report to the Contracting Officer.

1. Notify Contracting Officer 48 hours in advance of date and time of inspection.

2. Completed roof system shall be free of leaks.

3. Correct deficiencies in or remove roofing that does not comply with requirements, repair substrate, reinstall roofing, and repair base flashing to a condition free of damage and deterioration no later than the time of Substantial Completion and according to warranty requirements.

END OF SECTION 076100

RFO Warehouse Re-roof & Re-siding Sheet Metal Flashing and Trim March 26, 2021 076200-1

SECTION 076200 - SHEET METAL FLASHING AND TRIM

PART 1 - GENERAL

1.1 SECTION REQUIREMENTS

A. Submittals: Product Data, Shop Drawings, and color Samples.

B. Coordinate installation of sheet metal flashing and trim with adjoining roofing and wall materials, joints, and seams to provide a leakproof, secure, and noncorrosive installation.

C. Warranty on Finishes: Manufacturer agrees to repair or replace sheet metal flashing and trim that shows evidence of deterioration of factory-applied finishes within 20 years.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Standard: Comply with NRCA's "The NRCA Roofing Manual" and SMACNA's "Architectural Sheet Metal Manual" unless otherwise indicated. Conform to dimensions and profiles shown unless more stringent requirements are indicated.

B. SPRI Wind Design Standard: Manufacture and install low-slope roof edge flashings tested according to SPRI ES-1 and capable of resisting the following design pressure:

1. Design Pressure: 30 pounds per square foot (psf).

2.2 SHEET METAL

A. Metallic-Coated Steel Sheet: Galvanized steel sheet, ASTM A 653/A 653M, G90 (Z275), 0.022-inch (0.56-mm) nominal thickness.

1. Finish: Manufacturer's standard two-coat fluoropolymer system with color coat containing not less than 70 percent PVDF resin by weight.

2. Concealed Finish: Manufacturer's standard white or light-colored acrylic or polyester backer finish.

2.3 ACCESSORIES

A. Self-Adhering, High-Temperature Sheet Underlayment: Butyl; slip-resisting-polyethylene surfaced; with release paper backing; cold applied. Stable after testing at 240 deg F and passes after testing at minus 20 deg F; ASTM D 1970.

B. Slip Sheet: Rosin-sized building paper, 3-lb/100 sq. ft. minimum.

RFO Warehouse Re-roof & Re-siding Sheet Metal Flashing and Trim March 26, 2021 076200-2

C. Fasteners: Wood screws, annular-threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners.

1. Exposed Fasteners: Heads matching color of sheet metal roofing using plastic caps or factory-applied coating.

2. Spikes and Ferrules: Same material as gutter; with spike with ferrule matching internal gutter width.

3. Fasteners for Metallic-Coated Steel Sheet: Hot-dip galvanized steel or Series 300 stainless steel.

D. Butyl Sealant: ASTM C 1311, solvent-release butyl rubber sealant.

2.4 FABRICATION

A. Fabricate sheet metal flashing and trim to comply with details shown and recommendations in cited sheet metal standard that apply to the design, dimensions, geometry, metal thickness, and other characteristics of item indicated.

B. Expansion Provisions: Where lapped expansion provisions cannot be used, form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant concealed within joints.

C. Fabrication Tolerances: Fabricate sheet metal flashing and trim that are capable of installation to tolerances specified in MCA's "Guide Specification for Metal Roofing."

PART 3 - EXECUTION

3.1 INSTALLATION

A. Comply with cited sheet metal standards. Allow for thermal expansion; set true to line and level. Install work with laps, joints, and seams permanently watertight and weatherproof;

conceal fasteners where possible.

B. Sealant Joints: Where movable, nonexpansion-type joints are required, form metal to provide for proper installation of elastomeric sealant according to cited sheet metal standard.

C. Seams: Fabricate nonmoving seams with flat-lock seams.

D. Metal Protection: Where dissimilar metals contact each other, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating.

END OF SECTION 076200

RFO Warehouse Re-roof & Re-siding Roof Specialties March 26, 2021 077100-1

SECTION 077100 - ROOF SPECIALTIES

A. Section includes Gutters and Downspouts.

1.2 SECTION REQUIREMENTS

A. Submittals: Product Data, Shop Drawings, and Color Samples for selection and approval.

1.3 SIZE AND PROFILES

A. Gutters: Match existing gutter size and profile of removed gutters for each building. Locate gutters on each building at all eaves.

B. Downspouts: Make all downspouts for each building the same size. Base size on the largest existing downspout size on each respective building. Locate downspouts on each building at existing locations.

1.4 COLOR

A. Gutter: Match roof. Submit samples for approval.

B. Downspouts: Match background color of wall. Submit samples for approval.

2.1 MATERIALS

A. Aluminum Sheet: ASTM B 209, alloy and temper as recommended by manufacturer for use intended and finish indicated.

B. Aluminum Extrusions: ASTM B 221, alloy and temper as recommended by manufacturer for use intended and finish indicated.

C. Aluminum Finish: High-performance organic; AA-C12C42R1x; two-coat fluoropolymer system complying with AAMA 2604, with finish coats containing at least 70 percent polyvinylidene fluoride resin by weight.

RFO Warehouse Re-roof & Re-siding Roof Specialties March 26, 2021 077100-2

2.2 ROOF SPECIALTIES

A. General: Provide materials and types of fasteners, protective coatings, separators, sealants, and other miscellaneous items required by manufacturer for a complete installation.

B. Gutters and Downspouts:

1. Gutters: Manufactured in uniform section lengths not exceeding 12 feet, with matching corner units, ends, outlet tubes, and other accessories. Elevate back edge at least 1 inch above front edge. Furnish flat-stock gutter straps, gutter brackets, expansion joints, and expansion-joint covers fabricated from same metal as gutters.

a. Fabricate from Formed Aluminum: 0.063 inch thick

2. Downspouts: Rectangular open-face with mitered elbows, manufactured from the following exposed metal. Furnish wall brackets of same material and finish as downspouts, with anchors.

a. Formed Aluminum: 0.063 inch thick

C. Fasteners: Series 300 stainless steel or hot-dip galvanized steel according to ASTM A 153/A

153M or ASTM F 2329.

3.1 INSTALLATION

A. Coordinate with installation of roof decks and other substrates to produce a watertight assembly capable of withstanding inward and outward loading pressures, and thermal and lateral loads.

B. Coat back side of aluminum roof specialties with bituminous coating where they will contact wood, ferrous metal, or cementitious construction.

C. Expansion Provisions: Install running lengths to allow controlled expansion for movement of metal components, and to prevent water leakage, deformation, or damage.

D. Downspouts: Join sections with manufacturer's standard telescoping joints. Provide hangers with fasteners designed to hold downspouts securely to walls and 1 inch away from walls; locate fasteners at top and bottom and at approximately 60 inches on center.

END OF SECTION 077100

RFO Warehouse Re-roof & Re-siding Snow Guards March 26, 2021 077253-1

SECTION 077253 - SNOW GUARDS

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes: Rail-type, seam-mounted snow guards. Locate snow guards on each building within a few feet of all eave lines.

1.2 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Shop Drawings: Include roof plans showing layouts and attachment details of snow guards.

1. Include details of rail-type snow guards.

C. Samples:

1. Rail-Type Snow Guards: Bracket and 12-inch-long.

D. Delegated-Design Submittal: For snow guards, include analysis reports signed and sealed by the qualified professional engineer responsible for their preparation.

1. Include calculation of number and location of snow guards.

1.3 INFORMATIONAL SUBMITTALS

A. Qualification Data: For professional engineer's experience with providing delegated design engineering services of the kind indicated, including documentation that the engineer is licensed in the state in which the Project is located.

B. Product Test Reports: For each type of snow guard, for tests performed by a qualified testing agency, indicating point of failure of attachment to roof system identical as that used on this Project.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Delegated Design: Engage a qualified professional engineer to design snow guards, including attachment to building, based on the following:

1. Roof snow load.

2. Snow drifting

March 26, 2021 077253-2

3. Roof slope.

4. Roof type.

5. Roof dimensions.

6. Roofing substrate type and thickness.

7. Snow guard type.

8. Snow guard fastening method and strength.

9. Snow guard spacing.

10. Coefficient of Friction Between Snow and Roof Surface: 0.

11. Factor of Safety: 2.

B. Performance Requirements: Provide snow guards that withstand exposure to weather and resist thermally induced movement without failure, rattling, or fastener disengagement due to defective manufacture, fabrication, installation, or other defects in construction.

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

C. Structural Performance: Snow guards shall withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated.

1. Snow Loads: 20 pounds per square foot (psf).

2.2 RAIL-TYPE SNOW GUARDS

A. Seam-Mounted, Rail-Type Snow Guards:

1. Description: Snow guard rails fabricated from metal pipes, bars, or extrusions, anchored to brackets and equipped with two rails.

2. Material and Finish: Aluminum; mill finish.

3. Seam clamps: ASTM B85/B85M aluminum casting with stainless steel set screws incorporating round nonpenetrating point; designed for use with applicable roofing system to which clamp is attached.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install snow guards according to manufacturer's written instructions.

1. Space rows as recommended by manufacturer.

B. Attachment for Standing-Seam Metal Roofing:

1. Do not use fasteners that will penetrate metal roofing or fastening methods that void metal roofing finish warranty.

2. Seam-Mounted, Rail-Type Snow Guards:

a. Install brackets to vertical ribs in straight rows.

March 26, 2021 077253-3

b. Secure with stainless steel set screws, incorporating round nonpenetrating point, on same side of standing seam.

c. Torque set screw according to manufacturer's instructions.

d. Install cross members to brackets.

END OF SECTION 077253

RFO Warehouse Re-roof & Re-siding Joint Sealants March 26, 2021 079200-1

SECTION 079200 - JOINT SEALANTS

PART 1 - GENERAL

1.1 SECTION REQUIREMENTS

A. Submittals: Product Data and color Samples.

B. Environmental Limitations: Do not proceed with installation of joint sealants when ambient and substrate temperature conditions are outside limits permitted by joint-sealant manufacturer or are below 40 deg F.

PART 2 - PRODUCTS

2.1 JOINT SEALANTS

A. Compatibility: Provide joint sealants, joint fillers, and other related materials that are compatible with one another and with joint substrates under service and application conditions.

B. Sealant for Use in Building Expansion Joints:

1. Single-component, neutral-curing silicone sealant, ASTM C 920, Type S; Grade NS;

Class 50; for Use NT.

C. Sealant for General Exterior Use Where Another Type Is Not Specified:

1. Single-component, nonsag urethane sealant, ASTM C 920, Type S; Grade NS; Class 25;

and for Use NT.

2.2 MISCELLANEOUS MATERIALS

A. Provide sealant backings of materials that are nonstaining; are compatible with joint substrates, sealants, primers, and other joint fillers; and are approved for applications indicated by sealant manufacturer based on field experience and laboratory testing.

B. Cylindrical Sealant Backings: ASTM C 1330, of size and density to control sealant depth and otherwise contribute to producing optimum sealant performance.

C. Bond-Breaker Tape: Polyethylene tape or other plastic tape recommended by sealant manufacturer for preventing sealant from adhering to rigid, inflexible joint-filler materials or joint surfaces at back of joint. Provide self-adhesive tape where applicable.

D. Primer: Material recommended by joint-sealant manufacturer where required for adhesion of sealant to joint substrates indicated, as determined from preconstruction joint-sealant-substrate tests and field tests.

RFO Warehouse Re-roof & Re-siding Joint Sealants March 26, 2021 079200-2

PART 3 - EXECUTION

3.1 INSTALLATION

A. Comply with ASTM C 1193.

B. Clean out joints immediately before installing joint sealants to comply with joint-sealant manufacturer's written instructions.

C. Use masking tape where required to prevent contact of sealant or primer with adjoining surfaces that otherwise would be permanently stained or damaged by such contact or by cleaning methods required to remove sealant smears. Remove tape immediately after tooling without disturbing joint seal.

D. Install sealant backings to support sealants during application and to produce cross-sectional shapes and depths of installed sealants that allow optimum sealant movement capability.

E. Install bond-breaker tape behind sealants where sealant backings are not used between sealants and backs of joints.

F. Tooling of Nonsag Sealants: Immediately after sealant application and before skinning or curing begins, tool sealants according to requirements specified in subparagraphs below to form smooth, uniform beads of configuration indicated; to eliminate air pockets; and to ensure contact and adhesion of sealant with sides of joint.

1. Remove excess sealant from surfaces adjacent to joints.

2. Use tooling agents that are approved in writing by sealant manufacturer and that do not discolor sealants or adjacent surfaces.

3. Provide concave joint profile per Figure 8A in ASTM C 1193, unless otherwise indicated.

END OF SECTION 079200