10-A02 Bryan Hill ROOF PVC replacement and slate repair RFP and Mitigation.pdf

St. Louis Public Schools Bryan Hill Elementary School Roof Section A=PVC, E=Slate

075419 - Page 1 of 16 POLYVINYL-CHLORIDE (PVC/TPA) & Slate ROOFING

SECTION 075419 - POLYVINYL-CHLORIDE (PVC/TPA) ROOFING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

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

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

3. Sweep roof deck clean.

a. Install rosin paper over wood, tack in place.

b. Install heavy duty base sheet to deck, mechanically fastened 7 inches on center on the laps and 2 rows of 7 inches staggered in the field.

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4. Install 1/2 -inch layer of wood fiber insulation in manufacturers recommended low rise foam adhesive. Walk boards into adhesive immediately after installation to achieve solid contact.

5. Install 60 Mil PVC single ply roof membrane and accessories.

a. Membrane to be adhered in manufacturer’s recommended adhesive.

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

7. Install new metal flashings at all metal flashing locations. Install new metal counterflashing's/coping, slip metal counterflashing detail at non-removable unit locations, miscellaneous metal flashings and related accessories. Install new gutters at the drainage edge.

8. Replace damaged 0.5 of Roof A-Slate Shingles windows carrying debris caused slate shingles to be damaged beyond repair

9. Replace (3) damaged Clay Roof Caps, 2’W x 2’L

10. Replace 10’ of damaged Aluminum Gutter Downspout

11. Plaster and paint 35sq, ft. Of damaged ceiling (7’ x 5’) in room 209A-1 coat primer, 2 coat finish paint

A. Alternates: Refer to Division 01 Section "Alternates" for description of Work in this Section affected by alternates.

B. Allowances: Refer to Division 01 Section "Allowances" for description of Work in this Section affected by allowances.

C. Unit Prices: Refer to Division 01 Section "Unit Prices" for description of Work in this Section affected by unit prices.

1.2 DEFINITIONS

A. Roofing Terminology: Refer to ASTM D1079 "Standard Terminology Relating to Roofing and Waterproofing" and glossary in applicable edition of NRCA's "The NRCA Roofing Manual:

Membrane Roof Systems" for definition of terms related to roofing work in this Section.

1.3 PREINSTALLATION MEETINGS

A. Preinstallation Roofing Conference: Conduct conference at Project site.

1. 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.

2. Review drawings and specifications.

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

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

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

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

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

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

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

10. Review roof observation and repair procedures after roofing installation.

1.4 ACTION SUBMITTALS

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

B. Shop Drawings: For roofing system. Include plans, elevations, sections, details, and attachments to other work.

1. Base flashings and membrane terminations.

a. Indicate details meet the requirements of NRCA required by this Section.

C. Samples for Verification: For the following products:

1. Sheet roofing, of color specified, including T-shaped side and end lap seam.

1.5 INFORMATIONAL SUBMITTALS

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

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

B. Manufacturer Certificates: Signed by roofing manufacturer certifying that roofing system complies with requirements specified in "Performance Requirements" Article.

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

C. Warranties: Unexecuted sample copies of special warranties.

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D. Inspection Reports: Reports of Roofing Inspector. Include weather conditions, description of work performed, tests performed, defective work observed, and corrective actions taken to correct defective work.

1.6 CLOSEOUT SUBMITTALS

A. Executed copies of warranties.

B. Maintenance Data: To include in maintenance manuals.

1.7 QUALITY ASSURANCE

A. 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, Architect, and employees, and qualified by the manufacturer to install manufacturer's product and furnish warranty of type specified.

B. Manufacturer Qualifications: Approved manufacturer listed in this Section, UL listed for roofing systems comparable to that specified for this Project, with minimum five years' experience in manufacture of thermoplastic roof membrane products in successful use in similar applications.

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

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

b. Samples of each component.

c. Sample submittal from similar project.

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

e. Sample warranty.

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

3. Approved manufacturers must meet separate requirements of Submittals Article.

C. 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:

1. An authorized full-time technical employee of the manufacturer.

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2. 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.

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

1.8 DELIVERY, STORAGE, AND HANDLING

A. 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.

B. 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.

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

C. 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.

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

1.9 PROJECT / FIELD CONDITIONS

A. 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.

B. 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.

1. 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.

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

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

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

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1.10 WARRANTY

A. 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.

1. Form of Warranty: Manufacturer's standard warranty form.

2. 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.

3. Warranty Period: 20 years from date of completion.

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

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

2. Scope of Warranty: Work of this Section.

3. Warranty Period: 3 years from date of completion.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. 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.

1. Garland.

2. Siplast.

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

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

2.2 PERFORMANCE REQUIREMENTS

A. 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.

1. Accelerated Weathering: Roofing system shall withstand 10,000 hours of exposure when tested according to ASTM G152, ASTM G154, or ASTM G155.

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2. 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.

B. Flashings and Fastening: Comply with requirements of Division 07 Sections “Sheet Metal Flashing and Trim” and “Roof Specialties.” Provide base flashings, perimeter flashings, detail flashings and component materials and installation techniques that comply with the requirements and recommendations of the following:

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

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

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

C. Exterior Fire-Test Exposure: ASTM E108, 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.

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

2.3 MATERIALS, GENERAL

A. 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.

2.4 BASE SHEET MATERIALS

A. Sheathing Paper: Red-rosin type, minimum 3 lb./100 sq. ft (0.16 kg/sq. m).

B. Base Sheet:

1. Asphalt and glass-fiber roofing base and ply sheet for built up roofing systems, non-perforated asphalt-impregnated and coated, ASTM D4601 Type II.

a. Basis of design product: Tremco, BURmastic Glass Ply-28 lb.

b. Breaking Strength, minimum, ASTM D146: Machine direction, 90 lbf/in (15 kN/m);

Cross machine direction, 70 lbf/in (12 kN/m).

c. Pliability, 1/2-inch (12.7 mm) radius bend, ASTM D146: No failures.

d. Weight, ASTM D228: 28 lb/100 sq. ft. (1.37 kg/m2).

2.5 THERMOPLASTIC MEMBRANE MATERIALS

A. PVC Roof Membrane:

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1. Thermoplastic PVC/TPA sheet, internally reinforced fabric, Energy Star qualified, CRRC listed, and California Title 24 Energy Code compliant, ASTM D4434 Type IV.

a. Basis of design product: Tremco, TPA Single Ply Roof Membrane.

b. Tensile Strength at 0 deg. F (-18 deg. C), minimum, ASTM D751: 300 lbf/in (1330 N).

c. Tear Strength at 77 deg. F (25 deg. C), minimum, ASTM D751: 100 lbf (440 N).

d. Elongation at 0 deg. F (-18 deg. C), minimum at fabric break, ASTM D751: 25 percent machine direction, 25 percent cross-machine direction.

e. Minimum Thickness, nominal, ASTM D751: 0.060 in (1.5 mm).

f. Color: White.

g. Solar Reflectance Index (SRI), ASTM E1980: 108 (White, initial) 84 (White, 3-year aged).

B. Membrane Flashing: Manufacturer’s standard, smooth-backed, sheet flashing of same material, type, reinforcement, thickness, and color as PVC sheet membrane.

2.6 AUXILIARY ROOFING MATERIALS

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

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

B. Membrane Adhesive:

1. Elastomeric solvent-based contact-type adhesive for bonding TPA fleece-backed and non-fleece-backed single ply membranes and flashings to substrates.

a. Basis of design product: Tremco, TPA Single Ply Bonding Adhesive.

b. Density at 77 deg. F (25 deg. C), minimum, ASTM D147: 7.0 lb/gal (0.84 kg/L).

c. Percent solids, minimum ASTM D316: 25 percent.

d. VOC, maximum, ASTM D 3960: 612 g/L.

C. Flashing Membrane Adhesive: Same as membrane bonding adhesive.

D. Metal Termination Bars: Manufacturer’s standard predrilled stainless steel or aluminum bars, approximately 1 by 1/8 inch (25 mm by 3 mm) thick; with anchors.

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

1. 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.

a. Basis of design product: Tremco, TremSEAL Pro.

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

c. Hardness, Shore A, ASTM C661: 40.

d. Adhesion to Concrete, ASTM C794: 35 pli.

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

f. Color: Closest match to substrate.

F. Prefabricated Pipe Flashings: As recommended by roof membrane manufacturer.

G. Miscellaneous Accessories: Provide pourable sealers, preformed cone and vent sheet flashings, preformed inside and outside corner sheet flashings, T-joint covers, lap sealants, termination reglets, and other accessories.

2.7 ROOF INSULATION ACCESSORIES

A. Coverboard:

1. 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.

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

b. Compressive strength, ASTM C165: 15 lb./sq. in.

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

d. Recycled content, pre-consumer: 20 percent.

e. Rapidly renewable content: 6 percent.

f. Thickness: 1/2 inch (13 mm).

B. Roof Insulation Adhesive:

1. Urethane adhesive, bead-applied, low-rise two-component solvent-free low odor, formulated to adhere roof insulation to substrate.

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a. Basis of design product: Tremco, Low Rise Foam Insulation Adhesive.

b. Flame Spread Index, ASTM E84: 10.

c. Smoke Developed Index, ASTM E84: 30.

d. Volatile Organic Compounds (VOC), maximum, ASTM D3960: 0 g/L.

e. Tensile Strength, minimum, ASTM D412: 250 psi (1720 kPa).

f. Peel Adhesion, minimum, ASTM D903: 17 lb./in (2.50 kN/m).

g. Flexibility, 70 deg. F (39 deg. C), ASTM D816: Pass.

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

D. Wood Cant Strips: Comply with requirements in Division 06 rough carpentry Section.

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

F. Substrate Joint Tape: 6- or 8-inch- (150- or 200-mm-) wide, coated, glass fiber.

G. Insulation Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Approvals 4470, designed for fastening roof insulation and cover boards to substrate, and acceptable to roofing system manufacturer.

PART 3 - EXECUTION

3.1 EXAMINATION

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

1. 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.

2. Verify that wood cants, blocking, curbs, and Nailers are securely anchored to roof deck at penetrations and terminations and that Nailers match thicknesses of insulation.

3. Wood Roof Deck: Verify that deck is sound and dry and securely fastened with no projecting fasteners and with no adjacent units more than 1/16 inch (1.6 mm) out of plane relative to adjoining deck.

4. Verify that existing substrate is sound and dry.

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

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3.2 PREPARATION

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

B. 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.

C. 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.

3.3 INSTALLATION, GENERAL

A. Install roofing system in accordance with manufacturer’s written instructions and approved details.

B. 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.

3.4 BASE SHEET INSTALLATION

A. Loosely lay one course of sheathing paper, lapping edges and ends a minimum of 2 inches and 6 inches (50 mm and 150 mm), respectively.

B. Install lapped base-sheet course, extending sheet over and terminating beyond cants. Attach base sheet as follows:

1. Mechanically fasten to substrate. Fasten sheet 7 inches on center on the laps and 2 rows of 7 inches staggered in the field of the sheet.

3.5 INSULATION INSTALLATION

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

B. Comply with membrane roofing system and insulation manufacturer's written instructions for installing roof insulation.

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

D. 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.

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

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E. Adhered Insulation: Install each layer of insulation and adhere to substrate as follows:

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

F. Cover Boards: 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.

1. Secure cover boards to resist uplift pressure at corners, perimeter, and field of roof.

2. Adhere cover boards by setting in ribbons of bead-applied insulation adhesive, firmly pressing and maintaining cover board in place.

3.6 ADHERED MEMBRANE ROOFING INSTALLATION

A. Adhere membrane roofing over area to receive roofing and install according to membrane roofing system manufacturer's written instructions.

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

C. Accurately align membrane roofing and maintain uniform side and end laps of minimum dimensions required by manufacturer. Stagger end laps.

D. Solvent-Based Bonding Adhesive: Apply to substrate and underside of membrane roofing at rate required by manufacturer and allow adhesive to become tacky before installing membrane roofing; do not allow adhesive to fully dry. Roll membrane into adhesive. Do not apply adhesive to splice area of membrane.

E. In addition to adhering, mechanically fasten membrane roofing securely at terminations, penetrations, and perimeter of roofing.

F. Apply membrane roofing with side laps shingled with slope of roof deck where possible.

G. Welded Seams: Clean seam areas, overlap membrane roofing, and hot-air weld side and end laps of membrane roofing and sheet flashings according to manufacturer's written instructions to ensure a watertight seam installation.

1. Test lap edges with probe to verify seam weld continuity. Apply lap sealant to seal cut edges of sheet membrane.

2. Verify field strength of seams a minimum of twice daily and repair seam sample areas.

3. Repair tears, voids, and lapped seams in roofing that do not comply with requirements.

H. Spread sealant bed over deck drain flange at roof drains and securely seal membrane roofing in place with clamping ring.

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3.7 BASE FLASHING INSTALLATION

A. Install sheet flashings and performed flashing accessories and adhere to substrates according to membrane roofing system manufacturer's written instructions.

B. Apply bonding adhesive to substrate and underside of sheet flashing at required rate and allow to partially dry. Do not apply to the seam area of flashing.

C. Flash penetrations and field-formed inside and outside corners with cured or uncured sheet flashing.

D. Clean seam areas, overlap, and firmly roll sheet flashings into the adhesive. Hot-air weld side and end laps to ensure a watertight seam installation.

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

3.8 FIELD QUALITY CONTROL

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

B. Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation on completion.

C. Repair or remove and replace components of membrane roofing system where inspections indicate that they do not comply with specified requirements.

D. Additional inspections, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

3.9 PROTECTING AND CLEANING

A. Protect membrane roofing system from damage and wear during 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 copies to Owner.

B. Correct deficiencies in or remove membrane roofing system that does not comply with requirements; repair substrates; and repair or reinstall membrane roofing system to a condition free of damage and deterioration at time of Substantial Completion and according to warranty requirements.

C. Clean overspray and spillage from adjacent construction using cleaning agents and procedures recommended by manufacturers of affected construction.

END OF SECTION 075419

SECTION 073113 – SLATE SHINGLES

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PART 1 – GENERAL

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. Contractors shall verify roof con-struction 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 the 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

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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

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Alternate 1:

Hazard Mitigation Opportunities (Appendix J-Informed) These recommendations are designed to reduce future disaster impacts and may qualify under Section 406 mitiga-tion provisions:

1. Impact-Resistant Roofing System• Replace slate shingles with Class 4 impact-rated composite or metal roofing. • Install hurricane-rated clay caps and sealant barriers to prevent uplift and water intrusion.

2. Anchored Gutter and Downspout System• Replace aluminum components with wind-rated steel or reinforced PVC systems. • Secure with hurricane clips and add de-bris guards to maintain drainage integrity.

3. Moisture-Resistant Ceiling Assemblies• Install mold-resistant gypsum board and sealed ceiling tiles in Room 209A and adjacent spaces. • Add attic vapor barriers to prevent future saturation from roof breaches.

4. Structural Reinforcement• Retrofit roof-to-wall connections with hurricane straps or clips per ASCE 7-16 standards. • Conduct engineering review of masonry anchor-ing and lateral load resistance.

5. Protective Measures and Early Warning Systems• Install NOAA weather radios and integrate alerts into school-wide emergency protocols. • Explore protective window film or storm shutters for vulnerable classrooms.

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

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

B. Membrane Flashing: Manufacturer’s standard, smooth-backed, sheet flashing of same material, type, reinforcement, thickness, and color as PVC sheet membrane.

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