Ashland Elementary School Slate Replacement: Section A, Low slope roofs B, C, D, E, F, J, K, I and Tuck-pointing

SECTION 073113 – SLATE SHINGLES

PART 1 – GENERAL

St. Louis Public Schools is seeking a qualified roofing contractor to repair and replace all the tornado damaged roofing, gutters, sheet metal, and tuck-pointing. It is our goal to get a complete warranty roof system which includes but is not limited to Slate tile and Modified -Bitumen asphalt roofing

1.1 SUMMARY

A. Section includes:

1. Supply all labor, transportation, material apparatus, tools, and permits necessary for removal and replacement of existing roofing system. Contractor shall verify roof construction and square feet. Refer to roof plan drawing for roof area locations.

2. Natural slate roofing shingles

3. Underlayment and flashing

4. Fasteners and accessories

5. Wood deck repairs as needed throughout.

6. Install new gutters and downspouts to match existing metal thickness, profile and color. Kynar coated metal will be accepted instead of copper/stainless. The district will keep all copper materials.

1.2 REFERENCES

A. ASTM C406 – Standard Specification for Roofing Slate B. ASTM D226 – Asphalt-Saturated Organic Felt C. ASTM D4869 – Asphalt-Saturated Organic Felt Underlayment D. NRCA – National Roofing Contractors Association Guidelines E. SMACNA – Sheet Metal and Air Conditioning Contractors National Association Standards

1.3 SUBMITTALS

A. Product data for slate, underlayment, fasteners, and accessories B. Slate samples showing full range of color and texture C. Installation details D. Certificates of compliance with ASTM C406 E. Warranty documentation

1.4 QUALITY ASSURANCE

A. Installer qualifications: Minimum 5 years experience in slate roofing.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Store slate on pallets off ground, under cover, and ventilated B. Do not double-stack pallets C. Protect from moisture and physical damage

1.6 WARRANTY

Manufacturer’s warranty for slate: Minimum 75 years Installer’s warranty: 3 years labor and workmanship

PART 2 – PRODUCTS

2.1 SLATE SHINGLES

B. Material:

1. ASTM C406 Grade S1 (High Density, Weather Resistant)

2. Type: Natural split slate

3. Thickness: 3/8” to 1/2” (9 to 13 mm)

4. Length x Width: [e.g., 20” x 10”] (customizable)

5. Color: Specify – e.g., unfading gray/green, mottled purple/black. To be chosen by owner from available colors.

C. Pre-drilled holes: Required

2.2 UNDERLAYMENT

A. Ice and Water Shield:

1. Self-adhering, rubberized asphalt membrane

2. ASTM D1970 compliant B. Felt Underlayment:

1. ASTM D226 Type II or ASTM D4869 No. 30 asphalt-saturated felt

2.3 FLASHING AND METAL WORK

A. Material: Copper, minimum 16 oz. (preferred), or stainless steel B. Drip edge, step flashing, valley flashing, ridge and hip caps C. SMACNA compliant

2.4 FASTENERS

A. Copper or stainless steel roofing nails B. Minimum 1-1/2” long, ring shank preferred C. Two nails per slate shingle

PART 3 – EXECUTION

3.1 EXAMINATION

A. Verify deck is smooth, clean, and properly sloped B. Repair damaged decking before starting

3.2 INSTALLATION

A. General:

1. Follow Slate Roofing Contractors Association (SRCA) guidelines

2. Double coverage: Minimum 3” headlap, 3” side lap B. Eave Protection:

1. Install ice and water shield minimum 36” upslope from eaves

2. Extend underlayment 6” vertically at sidewalls C. Underlayment:

1. Install felt underlayment over dry deck, lapped 2” horizontal and 6” vertical D. Slate Application:

1. Start at eaves; stagger joints every course

2. Maintain consistent exposure (typically 7” to 8”)

3. Use hook ladder or roof brackets for access; no walking on slate E. Flashing:

1. Install step flashing at all walls and chimneys

2. Use open or closed valleys as specified, with metal lining F. Ridge and Hip Caps:

1. Use matching slate or copper hip/ridge treatment

3.3 CLEANING

A. Remove all debris and unused materials B. Clean adjacent surfaces of roofing residue

3.4 PROTECTION

a. Protect completed work from damage until final acceptance

SECTION 075216.11 - SBS MODIFIED BITUMINOUS MEMBRANE ROOFING, HOT-APPLIED

This Tremco PRODUCT MASTERSPEC specifies Tremco hot-applied SBS-modified and hybrid bituminous membrane roof systems , consisting of multiple plies of SBS membranes or roofing felts set in hot asphalt adhesive, with roofing accessories including separation board, vapor barrier, insulation, cover board, fasteners, membrane flashings, and granular, aggregate or smooth-coating surfaces. This Section may also be used with cold-applied surfacing.

The companion Sections 076200 Sheet Metal Flashing and Trim, 077100 Roofing Specialties, and 077129 Manufactured Roof Expansion Joints specify the low-slope metal flashings and custom or manufactured roof edge, copings and roof drainage items that together with the work of this section form the total roof system. These TremSpec sections reference this section's warranty provisions.

Roofing Installer's Warranty Form is now Section 070101.01 MEMBRANE ROOFING INSTALLER'S WARRANTY. Be sure to include this document in your project when required.

GENERAL

1.1 SUMMARY

The Work consists of the following:

Supply all labor, transportation, material, apparatus, tools, and permits necessary for removal and replacement of existing roof system. Contractors shall verify roof construction and square feet. Refer to roof plan drawing for roof area locations.

Complete removal of existing roofing system including but not limited to membrane, flashings, metal flashings, and insulation down to the underlying roof decking.

Sweep roof deck clean:

Concrete decks: prime entire concrete with manufacturer’s recommended primer prior to roof insulation application.

Wood decks: install heavy base sheet, mechanically fastened 7 inches on center on the laps and 2 rows of 7 inches staggered in the field.

Thermal insulation (to be field verified during pre-bid meeting):

Concrete decks (B, C, E, F): Install two layers of 2.6-inch polyisocyanurate insulation to the primed concrete deck. Walk boards into adhesive immediately after installation to achieve solid contact.

Adhere insulation if solid mopping of Type IV hot asphalt.

Metal decks (J, K, I): Mechanically fasten 2 layers of 2.6-inch polyisocyanurate insulation to the metal using one fastener every 2 square feet.

Wood Deck (D) will not have thermal insulation.

Install ½ inch layer of wood fiber insulation in solid mopping of Type IV hot asphalt. Walk boards into adhesive immediately after installation to achieve solid contact.

Install two (2) ply cold applied modified bitumen roof system with white granule surface.

Install one (1) heavy duty base sheet adhered in solid mopping of Type IV hot asphalt.

Plies must be broomed or rolled during installation to ensure proper contact with the hot asphalt.

Install POWERply Standard Plus FR surfacing sheet in solid mopping of Type IV hot Asphalt.

Plies must be broomed or rolled during installation to ensure proper contact with the hot asphalt.

Install 2-ply modified bitumen base flashings as specified in general flashing requirements.

Install new lead flashings at plumbing stack locations.

Install all sheet metal details per specifications and SMACNA and manufacturer’s requirements and standards.

Install new kynar coated metal flashings at all metal flashing locations. Install new metal counterflashings/coping, slip metal counterflashing detail at non-removable unit locations, miscellaneous metal flashings and related accessories.

DEFINITIONS

A. Roofing Terminology: Refer to ASTM D1079 "Standard Terminology Relating to Roofing and Waterproofing" and applicable edition of NRCA's "The NRCA Roofing Manual: Membrane Roof Systems" and NRCA’s Glossary for definition of terms related to roofing work in this Section.

Retain paragraph below if using traditional roofing asphalt complying with ASTM D312; delete if only SEBS-modified roofing asphalt complying with ASTM D6152 is required.

Hot Roofing Asphalt: Roofing asphalt heated to its equiviscous temperature, the temperature at which its viscosity is 125 centipoises for mop-applied roofing asphalt and 75 centipoise for mechanical spreader-applied roofing asphalt, within a range of plus or minus 25 deg. F (14 deg. C), measured at the mop cart or mechanical spreader immediately before application.

PREINSTALLATION MEETINGS

Retain paragraph below if Work of this Section is extensive or complex enough to justify a preinstallation conference. Preinstallation roofing conference is recommended with or without a preliminary roofing conference.

Preinstallation Roofing Conference: Conduct conference at Project site.

Meet with Owner, Owner's insurer if applicable, testing and inspecting agency representative, roofing Installer, roofing system manufacturer's representative, and installers whose work interfaces with or affects roofing, including installers of roof accessories and roof-mounted equipment.

Review drawings and specifications.

Review methods and procedures related to roofing installation, including manufacturer's written instructions.

Review and finalize construction schedule and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

Examine substrate conditions and finishes for compliance with requirements, including flatness and fastening.

Review structural loading limitations of roof deck during and after roofing.

Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect roofing system.

Review governing regulations and requirements for insurance and certificates if applicable.

Review temporary protection requirements for the roofing system during and after installation.

Review roof observation and repair procedures after roofing installation.

ACTION SUBMITTALS

Product Data: For each type of product indicated.

Sustainable Design Submittals:

Retain first subparagraph below if roof materials are required to comply with sustainable design requirements in Part 2; coordinate with requirements selected in Part 2 for roof materials. Coordinate with Division 01 Section "Sustainable Design Requirements" if applicable Product Test Reports for Solar Reflectance: For roof materials, indicating that roof materials comply with Solar Reflectance Index requirement.

Product Data and Laboratory Test Reports: For adhesives and sealants, indicating compliance with requirements for low-VOC/low-emitting materials.

Shop Drawings: For roofing system. Include plans, elevations, sections, details, and attachments to other work. Provide roof plan showing orientation and types of roof deck, orientation of membrane roofing, and fastening spacings and patterns for mechanically fastened components.

Base flashings and built-up terminations.

Tapered insulation, including slopes.

Crickets, saddles, and tapered edge strips, including slopes.

Samples for Verification: For the following products:

Sheet roofing materials, of color specified for exposed material.

INFORMATIONAL SUBMITTALS

Qualification Data: For Installer, Manufacturer, and Roofing Inspector.

Include letter from Manufacturer written for this Project indicating approval of Installer.

Manufacturer Certificates:

Submit evidence of compliance with requirements specified in the “Performance Requirements" Article.

Include: External fire resistance submittal.

Product Compatibility: Indicate manufacturer has verified compatibility of roofing system components, including but not limited to: Roofing membrane, flashing sheets, adhesives, and sealants.

Warranties: Unexecuted sample copies of warranties.

Field Quality Control Reports: Reports of Roofing Inspector. Include weather conditions, description of work performed, tests performed, defective work observed, and Contractor's corrective actions taken to correct defective work.

Submit reports within 48 hours after installation.

Manufacturer's Instructions: Submit copy of manufacturer's written installation instructions for specified roofing system.

CLOSEOUT SUBMITTALS

Maintenance Data: To include in maintenance manuals.

Warranties: Executed copies of warranties.

QUALITY ASSURANCE

Installer Qualifications: An employer of workers trained and certified by manufacturer, including a full-time on-site supervisor with a minimum of five years' experience installing products comparable to those specified, able to communicate verbally with Contractor, and employees, and qualified by the roofing system manufacturer to install manufacturer's product and furnish warranty of type specified.

Manufacturer Qualifications: Approved manufacturer with roofing systems comparable to those specified for this Project, with a minimum of five years' experience in manufacture of comparable products in successful use in similar applications, and able to furnish warranty with provisions matching specified requirements.

Retain paragraph below if Owner allows substitutions but requires strict control over qualifying of substituted manufacturers.

Approval of Comparable Products: Submit the following in accordance with project substitution requirements, within time allowed for substitution review:

Contractor's Product Certificate: Submit notarized certificate, indicating products intended for Work of this Section, including product names and numbers and manufacturer names, with statement indicating that products to be provided meet the requirements of the Contract Documents.

Product data, including certified independent test data indicating compliance with requirements.

Samples of each component.

Sample submittal from similar project.

Project references: Minimum of five installations of specified products not less than five years old, with Owner and contact information.

Sample warranty.

Substitutions following the award of contract are not allowed except as stipulated in Division 01 General Requirements.

Approved manufacturers must meet separate requirements of Submittals Article.

Roofing Inspector Qualifications: A technical representative of manufacturer not engaged in the sale of products and experienced in the installation and maintenance of the specified roofing system, qualified to perform roofing observation and inspection specified in Field Quality Control Article, to determine Installer's compliance with the requirements of this Project, and approved by the manufacturer to issue warranty certification. The Roofing Inspector shall be one of the following:

An authorized full-time technical employee of the manufacturer.

An independent party certified as a Registered Roof Observer by the International Institute of Building Enclosure Consultants (formerly the Roof Consultants Institute) retained by the Contractor or the Manufacturer and approved by the Manufacturer.

Manufacturer's Installation Instructions: Obtain and maintain on-site access to manufacturers’ written recommendations and instructions for installation of products.

DELIVERY, STORAGE, AND HANDLING

Deliver roofing materials to Project site in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, approval or listing agency markings, and directions for storing and mixing with other components.

Store liquid materials in their original undamaged containers in a clean, dry, protected location and within the temperature range required by roofing system manufacturer. Protect stored liquid material from direct sunlight.

Discard and legally dispose of liquid material that cannot be applied within its stated shelf life.

Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Store in a dry location. Comply with insulation manufacturer's written instructions for handling, storing, and protecting during installation.

Handle and store roofing materials and place equipment in a manner to avoid permanent deflection of deck.

PROJECT / FIELD CONDITIONS

Retain, revise, or delete paragraphs and subparagraphs in this article to suit Project.

Weather Limitations: Proceed with installation only when it exists and forecasted weather conditions permit roofing system to be installed according to manufacturer's written instructions and warranty requirements.

Daily Protection: Coordinate installation of roofing so insulation and other components of roofing system not permanently exposed are not subjected to precipitation or left uncovered at the end of the workday or when rain is forecast.

Provide tie-offs at the end of each day's work to cover exposed roofing and insulation with a course of roofing sheet securely in place with joints and edges sealed.

Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing.

Remove temporary plugs from roof drains at the end of each day.

Remove and discard temporary seals before beginning work on adjoining roofing.

WARRANTY

Manufacturer's Warranty: Roof System Manufacturer's standard form in which Manufacturer agrees to repair or replace components of roofing system that fail in materials or workmanship within warranty period, as follows.

Warranty Form: Manufacturer's standard warranty form.

Scope of Warranty: Work of this Section and including sheet metal details and termination details installed by the roof system Installer and approved by the Roof System Manufacturer.

Warranty Period: 20 years from date of completion.

Installer Warranty: Installer's warranty signed by Installer, as follows.

Form of Warranty: Form acceptable to Roofing Manufacturer and Owner.

Scope of Warranty: Work of this Section.

Warranty Period: 3 years from date of completion.

PRODUCTS

MANUFACTURERS

Basis of Design: The roof system specified in this Section is based upon products of Tremco CPG Inc, Beachwood, OH, (800) 562-2728, www.tremcoroofing.com that are named in other Part 2 articles. Provide specified products or comparable products of one of the following.

Soprema.

Garland.

Manufacturers of comparable products: Approved by Owner prior to bid.

Retain "Source Limitations" Paragraph below if required to comply with FM Global, UL, applicable building code, or to comply with provisions of manufacturer's warranty.

Source Limitations: Obtain components for roofing system from same manufacturer as membrane roofing or manufacturer approved by membrane roofing manufacturer.

PERFORMANCE REQUIREMENTS

General Performance: Installed membrane roofing and base flashings shall withstand specified uplift pressures, thermally induced movement, and exposure to weather without failure due to defective manufacture, fabrication, installation, or other defects in construction. Membrane roofing and base flashings shall remain watertight.

Accelerated Weathering: Roofing system shall withstand 2000 hours of exposure when tested according to ASTM G152, ASTM G154, or ASTM G155.

Impact Resistance: Roof membrane shall resist impact damage when tested according to ASTM D3746/D3746M, ASTM D4272/D4272M, or the "Resistance to Foot Traffic Test" in FM Approvals 4470.

Flashings and Fastening: Provide base flashings, perimeter flashings, detail flashings and component materials and installation techniques that comply with the requirements and recommendations of the following:

NRCA Roofing Manual (Sixth Edition) for construction details and recommendations.

SMACNA Architectural Sheet Metal Manual (Seventh Edition) for construction details.

Retain the following as applicable; referenced section(s) must be included in the Project Manual.

Comply with the requirements of Division 07 Section "Sheet Metal Flashing and Trim".

Retain one of three options in first paragraph below based on fire classification of roof assembly and roof covering. Delete paragraph if including exterior fire-test exposure in FM Approvals class designation in "Performance Requirements" Article. Class A rating meets (IBC) building code requirements for all construction types; Refer to applicable code for acceptability of Class B or C ratings based upon construction type. Specify a Class A tested assembly whenever possible.

Exterior Fire-Test Exposure: ASTM E 108 or UL 790, Class A; for application and roof slopes indicated, as determined by testing identical membrane roofing materials by a qualified testing agency. Materials shall be identified with appropriate markings of applicable testing agency.

Solar Reflectance Index: Not less than 78 when calculated according to ASTM E1980, based on testing identical products by a qualified testing agency.

MATERIALS, GENERAL

Material Compatibility: Roofing materials shall be compatible with one another and adjacent materials under conditions of service and application required, as demonstrated by roof membrane manufacturer based on testing and field experience.

Retain "FM Global Material Standards" Paragraph below if FM material standards apply, but proposed system is not an FM RoofNav-listed system. Each product specified must be listed in RoofNav for its proposed use in the roof assembly. .

FM Global Material Standards: Roofing, base flashings, and component materials shall be identical to materials that comply with requirements in FM Global 4470 as part of a roofing system listed or approved by FM Global. Identify applicable materials with FM Global markings.

ROOF MEMBRANE MATERIALS

Base-Ply Sheet is the first ply in the roof membrane. Use this term to differentiate it from ply sheets of a different type/product.

Base-Ply Sheet:

SBS-modified asphalt-coated composite glass fiber mat / glass fiber scrim sheet, ASTM D6163 Type III Grade S.

Basis of design product: Tremco, POWERply Heavy Duty Base Sheet.

Tensile Strength at 0 deg. F (18 deg. C), minimum, ASTM D5147: Machine direction, 220 lbf/in (38 kN/m); Cross machine direction, 190 lbf/in (33 kN/m).

Elongation at 0 deg. F (-18 deg. C), minimum, ASTM D5147: Machine direction, 3.0 percent; Cross machine direction, 3.5 percent.

Tear Strength at 77 deg. F (25 deg. C), minimum, ASTM D5147: Machine direction 220 lbf (975N); Cross machine direction, 240 lbf (1065N).

Low Temperature Flexibility, minimum, ASTM D5147: 0 deg. F (-18 deg. C).

Thickness, minimum, ASTM D5147: 0.120 inch (3.0 mm).

SBS Modified Bituminous Membrane Granule-Surfaced Cap Sheet:

SBS/SIS/SEBS-modified asphalt-coated glass fiber reinforced sheet, granular surfaced, ASTM D6163 Type III Grade G.

Basis of design product: Tremco, POWERply Plus HT FR.

Exterior Fire-Test Exposure, ASTM E108: Class A.

Tensile Strength at 77 deg. F (25 deg. C), minimum, ASTM D5147: Machine direction 220 lbf/in (28 kN/m); Cross machine direction 220 lbf/in (29 kN/m).

Tear Strength at 77 deg. F (25 deg. C), minimum, ASTM D5147: Machine direction, 280 lbf (1315 N); Cross machine direction 300 lbf (1195 N).

Elongation at 77 deg. F (25 deg. C), minimum, ASTM D5147: Machine direction, 6.4 percent; Cross machine direction, 7.0 percent.

Low Temperature Flex, maximum, ASTM D5147: -25 deg. F (-31 deg. C).

Thickness, minimum, ASTM D5147: 0.134 inch (3.4 mm).

Flashing Backer Sheet:

SBS-modified asphalt-coated composite glass fiber mat / glass fiber scrim sheet, ASTM D6163 Type III Grade S.

Basis of design product: Tremco, POWERply Heavy Duty Base Sheet.

Tensile Strength at 0 deg. F (18 deg. C), minimum, ASTM D5147: Machine direction, 220 lbf/in (38 kN/m); Cross machine direction, 190 lbf/in (33 kN/m).

Elongation at 0 deg. F (-18 deg. C), minimum, ASTM D5147: Machine direction, 3.0 percent; Cross machine direction, 3.5 percent.

Tear Strength at 77 deg. F (25 deg. C), minimum, ASTM D5147: Machine direction 220 lbf (975N); Cross machine direction, 240 lbf (1065N).

Low Temperature Flexibility, minimum, ASTM D5147: 0 deg. F (-18 deg. C).

Thickness, minimum, ASTM D5147: 0.120 inch (3.0 mm).

Flashing Sheet:

Flashing Sheet: Same as cap sheet.

Basis of design product: Flashing Sheet: Same as cap sheet.

Detailing Fabric:

Woven Glass Fiber Mesh, Vinyl-Coated: Non-shrinking, non-rotting, vinyl-coated woven glass mesh for reinforcing flashing seams, membrane laps, and other roof system detailing.

Basis of design product: Tremco, BURmesh.

Tensile strength, 70 deg. F, min ASTM D146: Warp, 65 lbf/in (285 N); fill, 75 lbf/in (310 N).

Color: Aqua green.

ASPHALT MATERIALS

Asphalt primer, water-based, polymer modified.

Basis of design product: Tremco, TREMprime WB.

Volatile Organic Compounds (VOC), maximum, ASTM D3960: 2 g/L.

Color: Brown/black.

Hot-melt asphalt adhesive, ASTM D312 Type IV.

Basis of design product: Tremco, Premium IV Adhesive.

Softening Point, min/max, ASTM D36: 215–225 deg. F (100–105 deg. C).

Ductility at 77 deg. F, (25 deg C) minimum, ASTM D113: 1.5 cm.

Penetration at 77 deg. F (25 deg. C), min/max, ASTM D5: 15–25 dmm.

AUXILIARY MEMBRANE ROOFING MATERIALS

General: Auxiliary materials recommended by roofing system manufacturer for intended use and compatible with roofing membrane.

Liquid-type auxiliary materials shall comply with VOC limits of authorities having jurisdiction.

Select one or more of the following paragraphs as applicable to roof system. Refer to Tremco Flashing Matrix for product compatibilities. These products are typically used for 3-course stripping along with reinforcing fabrics.

Retain "Asphalt Roofing Cement / Mastic" Paragraph below if asphalt roofing cement is used to adhere flashings or integral metal sheet flashings and is acceptable to roofing system manufacturer.

Asphalt Roofing Cement / Mastic:

Roof Cement, Asphalt-Based: ASTM D4586, Type II, Class I, fibrated roof cement formulated for use in installation and repair of asphalt ply and modified bitumen roofing plies and flashings; UL-classified for fire resistance.

Basis of design product: Tremco, ELS.

Volatile Organic Compounds (VOC), maximum, ASTM D3960: 190 g/L.

Non-Volatile Matter, ASTM D4586: 85 percent.

Resistance to sag ASTM D4586: 1/8 in. (3 mm).

Stripping Reinforcing Fabric:

Woven Glass Fiber Mesh, Vinyl-Coated: Non-shrinking, non-rotting, vinyl-coated woven glass mesh for reinforcing flashing seams, membrane laps, and other roof system detailing.

Basis of design product: Tremco, BURmesh.

Tensile strength, 70 deg. F, min ASTM D146: Warp, 65 lbf/in (285 N); fill, 75 lbf/in (310 N).

Color: Aqua green.

Joint Sealant: Elastomeric joint sealant compatible with roofing materials, with movement capability appropriate for application.

Joint Sealant, Polyurethane: ASTM C920, Type S, Grade NS, Class 50 single-component moisture curing sealant, formulated for compatibility and use in dynamic and static joints; paintable.

Basis of design product: Tremco, TremSEAL Pro.

Volatile Organic Compounds (VOC), maximum, ASTM D3960: 40 g/L.

Hardness, Shore A, ASTM C661: 40.

Adhesion to Concrete, ASTM C794: 35 pli.

Tensile Strength, ASTM D412: 350 psi (2410 kPa).

Color: Closest match to substrate.

Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FM Global 4470, designed for fastening roofing components to substrate, tested by manufacturer for required pullout strength, and acceptable to roofing system manufacturer.

Retain the following when applicable; referenced section must be included in the Project Manual.

Metal Flashing Sheet: Metal flashing sheet is specified in Division 07 Section "Sheet Metal Flashing and Trim."

Miscellaneous Accessories: Provide miscellaneous accessories recommended by roofing system manufacturer.

ROOF INSULATION MATERIALS

Roof Insulation, General: Preformed roof insulation boards manufactured or approved by roofing manufacturer, selected from manufacturer's standard sizes suitable for application, of thicknesses indicated.

Retain the following for tapered systems which are comprised of flat-stock base layer(s) and tapered stock upper layer. New roofs require a slope of not less than 1/4 inch/ft. Replacement roofs should be installed at 1/4 inch/ft when possible however a lesser slope of 1/8 inch/ft may acceptable; confirm applicable code requirement. Saddles, crickets, edge strips, etc. must be twice the slope of the roof and are listed under the general requirement, above.

If required: Tapered Insulation: Provide factory-tapered insulation boards fabricated to slope of 1/8 inch per 12 inches (1:96) unless otherwise indicated.

Retain the following for all roof assemblies using flat or tapered insulation and requiring saddles, crickets, edge strips, drain sumps or any other miscellaneous tapered components.

Provide preformed saddles, crickets, tapered edge strips, and other insulation shapes where indicated for sloping to drain. Fabricate to slopes indicated, not less than two times the roof slope.

Roof Insulation:

Board Insulation, Polyisocyanurate: CFC- and HCFC- free, with recycled content glass-fiber mat facer on both major surfaces, ASTM C1289 Type II Class 1.

Basis of design product: Tremco, Trisotech Insulation.

Compressive Strength, ASTM D1621: Grade 2: 20 psi (138 kPa).

Conditioned Thermal Resistance at 75 deg. F (24 deg. C): 14.4 at 2.5 inches (50.8 mm) thick.

INSULATION ACCESSORIES

Roof Insulation Cover Board:

Board Insulation, Cellulosic fiber: With water-resistant binders, non-asphaltic primer coated on four sides and chemically treated for deterioration, ASTM C208, Type II, Grades 1 and 2.

Basis of design product: Tremco/Blue Ridge Structodek High Density Fiberboard.

Compressive strength, ASTM C165: 15 lbf/sq. in.

Thermal resistance at 75 deg. F (24 deg C.) ASTM C518: R 1.3.

Recycled content, pre-consumer: 20 percent.

Rapidly renewable content: 6 percent.

Thickness: 1/2 inch (13 mm).

Roof Insulation Adhesive:

Hot-melt asphalt adhesive, ASTM D312 Type IV.

Basis of design product: Tremco, Premium IV Adhesive.

Softening Point, min/max, ASTM D36: 215–225 deg. F (100–105 deg. C).

Ductility at 77 deg. F, (25 deg C) minimum, ASTM D113: 1.5 cm.

Penetration at 77 deg. F (25 deg. C), min/max, ASTM D5: 15–25 dmm.

Insulation Cant Strips: ASTM C208, Type II, Grade 1, cellulosic-fiber insulation board.

Tapered Edge Strips: ASTM C208, Type II, Grade 1, cellulosic-fiber insulation board.

Substrate Joint Tape: Minimum 6 inch (150 mm) wide, coated, glass-fiber joint tape.

SURFACING MATERIALS

WALKWAYS

Walkway Material:

Walkway cap sheet strips, SBS-modified asphalt sheet, granular surfaced.

Basis of design product: Same product as roof system cap sheet.

Color: Match cap sheet.

EXECUTION

EXAMINATION

Examine substrates, areas, and conditions, with Installer present, for compliance with the following requirements and other conditions affecting performance of roofing system:

Retain those paragraphs below that pertain to the deck and substrate conditions of the project.

Verify that roof openings and penetrations are in place and curbs are set and braced and that roof drain bodies are securely clamped in place.

Retain paragraph below if project will be let with wood cants, blocking, and nailers installed under another trade subcontract.

Verify that, blocking, curbs, and Nailers are securely anchored to roof deck at penetrations and terminations and that Nailers match thicknesses of insulation. wood cants Retain the following for all projects, except for retrofit/recover over existing roofing system components to remain in place.

Verify that substrate is sound and dry.

Retain reference to Division 05 "Steel Decking" Section for new construction or when applicable for deck replacement. Referenced Section should be prepared by a licensed design professional and must be included in the Project Manual.

Steel Roof Deck:

Verify that deck is securely fastened with no projecting fasteners and with no adjacent units in excess of 1/16 inch (1.6 mm) out of plane relative to adjoining deck.

Existing Concrete Roof Deck:

Verify that concrete substrate, is visibly dry and free of moisture. Test for moisture according to ASTM F2659 or other recognized test method utilizing non-destructive, electronic moisture meter.

When fastening components to concrete deck, instead of adhering, the following is not applicable.

Verify adhesion of new roofing components to concrete.

Wood Roof Deck: Verify that deck shows no signs of damage, rot or deterioration, and is securely fastened with no projecting fasteners and with no adjacent units in excess of 1/16 inch (1.6mm) out of plane relative to adjoining deck.

Proceed with installation only after unsatisfactory conditions have been corrected.

PREPARATION

Clean substrate of dust, debris, moisture, and other substances detrimental to roofing installation according to roofing system manufacturer's written instructions. Remove sharp projections.

Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto surfaces of other construction. Remove roof-drain plugs when no work is taking place or when rain is forecast.

Include and edit concrete deck priming when applicable for vapor retarder. Coordinate with Insulation Installation Article for priming concrete deck in preparation for adhered insulation or adhering membrane directly to deck. Refer to product data for priming requirements.

Concrete Surface Priming: Prime surface of concrete deck with asphalt primer at rate required by manufacturer and allow primer to dry.

INSTALLATION, GENERAL

Install the roofing system in accordance with manufacturer’s written instructions, approved shop drawings, and Contract Documents.

Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of the roofing system at the end of the workday or when rain is forecast. Remove and discard temporary seals before beginning work on adjoining roofing.

Retain first paragraph below if tie-ins to existing roofing are required.

Install roof membrane and auxiliary materials to tie in to existing roofing to maintain weathertightness of transition.

ROOFING INSTALLATION DETAILS

Choose only one of the following two NRCA Installation Details paragraphs. The first is a short version of the second.

Retain first "NRCA Installation Details" Paragraph below and delete following Paragraph and selected subparagraphs if Project drawings include adequate roofing installation details.

NRCA Installation Details: Install roofing system in accordance with applicable NRCA Manual Plates and NRCA recommendations; modify as required to comply with manufacturer's approved details and perimeter fastening requirements of FM Global references if applicable.

INSULATION INSTALLATION

Comply with built-up roofing manufacturer's written instructions for installing roof insulation.

Coordinate installing membrane roofing system components, so insulation is not exposed to precipitation or left exposed at the end of the workday.

Cant Strips: Install and secure preformed 45-degree cant strips at junctures of built-up roofing with vertical surfaces or angle changes greater than 45 degrees.

Tapered Insulation and Crickets: Install tapered insulation under area of roofing to conform to slopes indicated.

Include the bracketed option when roof slope is less than 1/4 inch in 12 inches.

Where crickets are indicated or required to provide positive slope to drain, make slope of cricket’s minimum of two times the roof slope, not less than 1/4 inch in 12 inches (1:48).

Install insulation with long joints of insulation in a continuous straight line with end joints staggered between rows, abutting edges and ends between boards. Fill gaps exceeding 1/4 inch (6 mm) with insulation.

Cut and fit insulation within 1/4 inch (6 mm) of Nailers, projections, and penetrations.

Insulation manufacturers usually recommend thickness in first paragraph below as maximum thickness of a single insulation layer. Edit paragraphs below to establish thickness of insulation required by code and project conditions. Coordinate with drawings. Consider using actual thickness in lieu of R-value/RSI to avoid disputes based upon alternate methods of calculating thermal resistance of insulation. (The base layer of insulation is the first, single, board layer, not the total flat-stock layer(s).) The minimum thickness of the base layer is often dictated by the wind uplift tested assembly; refer to applicable test report.

R-Value is an imperial system unit of measurement (ft2·°F·h/BTU) and the RSI Value is a metric system unit of measurement (sq. m.·K/W). To convert an R-Value to an RSI Value, divide the R-Value by 5.678. Conversely, to convert an RSI Value to an R-Value, multiply the RSI Value by 5.678.

NOTE: PIMA recommends two layers of equal thickness totaling [3.6 inches (91 mm) = R-20] [4.4 inches (112 mm) = R-25] [5.2 inches (132 mm) = R-30] [6.2 inches (157 mm) = R35] [7.0 inches (178 mm) = R-40]. NRCA recommend using R-5.0 per each 1 inch of thickness. The thickness of any layer should not be less than the minimum thickness required by the wind-tested assembly listing.

Install insulation under area of roofing to achieve required thickness. Where overall insulation thickness is 2.7 inch (70 mm) or greater, install two or more layers with joints of each succeeding layer staggered from joints of previous layer a minimum of 6 inches (150 mm) in each direction.

Retain one or both Insulation System Paragraphs below as appropriate for Project. Insert values and select either IP or SI unit of measure. If both IP and SI measurements are required use in-line editing to revise. IBC refers to R-value for Continuous Insulation (CI).

Flat Insulation System on Sloped Roof Deck: Install insulation at minimum thickness as follows:

Minimum total thickness of Continuous Insulation: 5.2 inches.

If required: Tapered Insulation System for Flat Roof Deck: Install insulation as follows:

CAUTION! "Average R-value" is ONLY permitted in jurisdictions under IECC-2021. IECC-2018 and prior MUST use "Minimum thickness" and "Continuous R-value."

IECC 2021’s Section C402.2.1.1-Tapered, Above-Deck Insulation Based on Thickness indicates when tapered insulation is used as a component of a roof-ceiling assembly R-value calculation, the tapered insulation’s R-value contribution to that calculation must use the average thickness in inches along with the material R-value per inch to comply with the minimum R-value required by the code. 1-inch (25 mm) thickness is required at low point (such as roof drain).

Minimum total thickness of Continuous Insulation: 3.5 inches.

Retain below if required for Project. Insulation drain sumps are allowed to taper down to a thickness of not less than 1 inch (25 mm) less than the thickness required to achieve the continuous insulation thickness required by code. The size of the sump is further dictated by the slope. For example: A 1-inch (25 mm) deep sump at 1/4 inch per foot (1:48) slope would have a size of 4 ft. by 4 ft (1200 by 1200 mm). To accommodate larger and/or deeper sumps, increase total insulation thickness as necessary.

Insulation Drain Sumps: Tapered insulation sumps, not less than 2 by 2 ft (600 by 600 mm), sloped to roof drain.

For projects under IECC-2018 and earlier.

Sump to maximum depth of not more than 1 inch (25 mm) less than the Project-stipulated continuous insulation thickness based upon code requirements.

For projects under IECC-2021, using Average R-value.

Maintain a minimum of 1 inch (25 mm) insulation thickness at low point.

Trim surface of insulation where necessary at roof drains so completed surface is flush and does not restrict flow of water.

Install tapered edge strips at perimeter edges of roof that do not terminate at vertical surfaces.

Retain applicable "Insulation Application Method" Paragraph(s) below.

Adhered Insulation Application Method: Install each layer of insulation and adhere to substrate as follows:

Prime surface of concrete deck with asphalt primer and allow primer to dry.

Choose one of the following methods for adhering insulation. Coordinate with wind-tested assembly listing.

Set each layer of insulation in a solid mopping of hot roofing asphalt, applied within plus or minus 25 deg. F (14 deg. C) of equiviscous temperature.

Set each layer of insulation in ribbons of bead-applied insulation adhesive, firmly pressing and maintaining insulation in place.

Cover Board Installation: Install cover boards over insulation with long joints in continuous straight lines with end joints staggered between rows. Offset joints of insulation below a minimum of 6 inches (150 mm) in each direction. Loosely butt cover boards together. Tape joints if required by roofing manufacturers.

Retain one of two options below if mechanical fastening of cover board is required. Use first option if specifying uplift by referencing FMG; use second option if referencing ASCE-7 or other engineered requirements.

Fasten cover board to resist uplift pressure at corners, perimeter, and field of roof.

Choose one of the following methods for adhering insulation. Coordinate with wind-tested assembly listing.

Apply hot roofing asphalt to substrate and immediately bond cover board to substrate.

HOT-APPLIED ROOFING MEMBRANE INSTALLATION, GENERAL

Install roofing membrane system according to roofing system manufacturer's written instructions and applicable recommendations in NRCA's "Quality Control and Quality-assurance Guidelines for the Application of Membrane Roofing" and as follows:

Base-Ply Sheet is the first ply in the roof membrane (when different than other ply sheets). Installation of Base Sheet installed on the deck, under insulation is specified elsewhere.

Base-Ply Sheet: One.

Adhering Method: Mopped.

Number of Smooth-Surfaced SBS-Modified Asphalt Ply Sheets: One.

Adhering Method: Mopped.

Granular-Surfaced SBS-Modified Asphalt Cap Sheet:

Adhering Method: Mopped.

Start installation of roofing membrane in presence of roofing system manufacturer's technical personnel.

Cooperate with testing agencies engaged or required to perform services for installing roofing system.

Coordinate installation of roofing system so insulation and other components of the roofing membrane system not permanently exposed are not subjected to precipitation or left uncovered at the end of the workday or when rain is forecast.

Provide tie-offs at the end of each day's work to cover exposed roofing membrane sheets and insulation with a course of coated felt set in compatible roofing cement/mastic or hot roofing asphalt, with joints and edges sealed.

Comply with roofing membrane manufacturer’s instructions and details for waterstop/daily tie-in; utilize staggered layout and unadhered, removable “deadman” insulation boards.

Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing.

Remove temporary plugs from roof drains at the end of each day.

Remove and discard temporary seals before beginning work on adjoining roofing.

Retain one of first two paragraphs below. Retain first for traditional roofing asphalt complying with ASTM D312; retain second for SEBS-modified roofing asphalt. Heating and application requirements may differ among roofing manufacturers.

Hot Roofing Asphalt Heating: Heat asphalt to its equiviscous temperature, measured at the mop cart or mechanical spreader immediately before application. Circulate asphalt during heating. Do not raise asphalt temperature above equiviscous temperature range more than one hour before time of application. Do not exceed asphalt manufacturer's recommended temperature limits during asphalt heating. Do not heat asphalt within 25 deg. F (14 deg. C) of flash point. Discard asphalt maintained at a temperature exceeding finished blowing temperature for more than four hours.

Apply hot roofing asphalt within plus or minus 25 deg. F (14 deg. C) of equiviscous temperature and adhere components to asphalt heated to not less than 425 deg. F (218 deg. C).

Substrate-Joint Penetrations: Prevent roofing asphalt and adhesives from penetrating substrate joints, entering building, or damaging roofing system components or adjacent building construction.

Specify the installation of the Base-Ply Sheet below, when system includes Hybrid (Glass-Fiber Interply sheets) or under SBS Modified Bituminous Membrane Installation, for non-hybrid roof membrane.

BASE-PLY SHEET INSTALLATION

Install lapped modified bituminous roofing membrane base-ply sheet according to roofing manufacturer's written instructions, starting at low point of roofing system. Extend roofing membrane sheets over and terminate beyond cants, installing as follows:

Adhere to substrate in a solid mopping of hot roofing asphalt applied at not less than 425 deg. F (218 deg. C).

SBS-MODIFIED BITUMINOUS MEMBRANE INSTALLATION

Install modified bituminous roofing membrane base-ply sheet and cap sheet according to roofing manufacturer's written instructions, starting at low point of roofing system. Extend roofing membrane sheets over and terminate beyond cants, installing as follows:

Unroll roofing membrane sheets and allow them to relax for minimum time period required by manufacturer.

Adhere to substrate in a solid mopping of hot roofing asphalt applied at not less than 425 deg. F (218 deg. C).

Laps: Accurately align roofing membrane sheets, without stretching, and maintain uniform side and end laps. Stagger end laps. Install roofing membrane sheets so side and end laps shed water. Completely bond and seal laps, leaving no voids.

Repair tears and voids in laps and lapped seams not completely sealed.

Apply roofing granules to cover exuded bead at laps while the bead is hot.

FLASHING AND STRIPPING INSTALLATION

Base Flashing Installation, General: Install base flashing over cant strips and other sloped and vertical surfaces, at roof edges, and at penetrations through roof; secure to substrates according to roofing system manufacturer's written instructions, and as follows:

Extend base flashing up walls or parapets a minimum of 12 inches (300 mm) above modified bituminous roofing and 6 inches (150 mm) onto field of roof membrane.

Prime substrates with asphalt primer if required by roofing system manufacturer.

Retain "Backer Sheet Installation" Paragraph below and choose one of three backer sheet installation subparagraphs when backer sheet is recommended by roofing manufacturer.

Backer Sheet Installation:

Backer Sheet Application: Mechanically fasten backer sheet to walls or parapets. Adhere backer sheet over roofing membrane at cants in a solid mopping of hot roofing asphalt.

Flashing Sheet Installation:

Choose one of the following two flashing sheet installation subparagraphs.

Adhere flashing sheet to substrate in a solid mopping of hot roofing asphalt. Apply hot roofing asphalt to back of flashing sheet if recommended by roofing system manufacturer. Mechanically fasten top of base flashing securely at terminations and perimeter of roofing.

Flashing Sheet Top Termination: Mechanically fasten top of base flashing securely at terminations and perimeter of roofing.

Seal top termination of base flashing with a metal termination bar and a continuous bead of joint sealant.

Flashing Sheet Bottom Termination: Adhere flashing sheet to roof membrane sheet continuously along bottom of flashing sheet.

Install roofing membrane cap-sheet strip where metal flanges and edgings are set on membrane roofing according to roofing system manufacturer's written instructions.

Install stripping, according to the roofing manufacturer's written instructions, where metal flanges and edgings are set on built-up roofing.

Coordinate with product selection under Part 2.

Flashing-Sheet Stripping: Install flashing-sheet stripping in a continuous coating of compatible mastic/adhesive sealer, as recommended by roofing manufacturer, and extend onto roofing membrane. Apply number of courses recommended by manufacturer.

Roof Drains: Set 30 by 30 inch (760 by 760 mm) square metal flashing in bed of compatible mastic/adhesive sealer on completed roofing membrane. Cover metal flashing with roofing membrane cap-sheet striping and extend a minimum of 6 inches (150 mm) beyond edge of metal flashing onto field of roofing membrane. Clamp roofing membrane, metal flashing, and stripping into roof-drain clamping ring.

Install strip according to roofing system manufacturer's written instructions.

WALKWAY INSTALLATION

Walkways, General: Install walkways according to roofing manufacturer's written instructions.

Install walkways at following locations:

Where indicated on Drawings.

Delete above and retain one of more of following subparagraphs if walkways are not shown on Drawings. Revise to suit Project requirements.

Perimeter of each rooftop unit.

Between each rooftop unit location, creating a continuous path connecting rooftop unit locations.

Between each roof hatch and each rooftop unit location or path connecting rooftop unit locations.

Top and bottom of each roof access ladder.

Between each roof access ladder and each rooftop unit location or path connecting rooftop unit locations.

Walkway Cap Sheet Strips: Install cap sheet strips, approximately 36 inches (900 mm) wide and in lengths not exceeding 10 feet (3000 mm), leaving a space of 6 inches (150 mm) between strips. Install roofing membrane walkway cap sheet strips over roofing membrane in cold-applied adhesive.

FIELD QUALITY CONTROL

Select whether Owner or Contractor will be responsible to provide and pay for the Roof Inspector's services. Retain and edit the subparagraph to suit project requirements when it is the Contractor's responsibility. The subparagraph is optional (may be deleted) when the Owner provides the Roof Inspector.

Roofing Inspector: Contractor shall engage a qualified roofing inspector to perform roof tests and inspections and to prepare test reports.

Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation at commencement and upon completion.

Notify Owner 48 hours in advance of date and time of inspection.

Repair or remove and replace components of built-up roofing where test results or inspections indicate that they do not comply with specified requirements.

Additional testing and inspecting, at Contractor's expense, will be performed to determine if replacement or additional work complies with specified requirements.

PROTECTING AND CLEANING

Protect roofing system from damage and wear during the remainder of construction period. When remaining construction will not affect or endanger roofing, inspect roofing for deterioration and damage, describing its nature and extent in a written report, with…