St. Louis Public Schools Stevens school gym and cafeteria roof & HVAC

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SBS MODIFIED BITUMINOUS MEMBRANE ROOFING, HOT-APPLIED

St. Louis Public Schools are looking for a qualified roofer to replace the highlighted sections of Stevens roof damaged by May 16, 2025, Storm with a new warrantied roof system.

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

PART 1 - GENERAL

1.1 SUMMARY

A. The Work consists of the following:

1. 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.

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 and prime entire concrete with manufacturer’s recommended primer prior to roof insulation application.

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4. Install tapered polyisocyanurate insulation to the primed concrete deck, 1/8 inch per foot slope with a starting thickness of 2 inches (subject to field verification). Walk boards into adhesive immediately after installation to achieve solid contact.

a. Adhere insulation if full mopping of Type IV hot asphalt.

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

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

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

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

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

Asphalt.

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

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

8. Install new lead flashings at plumbing stack locations.

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

10. 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.

1.2 DEFINITIONS

A. 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.

B. Hot Roofing Asphalt: Roofing asphalt heated to its Equi viscous temperature, the temperature at which its viscosity is 125 centipoises for mop-applied roofing asphalt and 75 centipoises 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.

1.3 PREINSTALLATION MEETINGS

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

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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.

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 the 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. Sustainable Design Submittals:

1. Product Test Reports for Solar Reflectance: For roof materials, indicating that roof materials comply with Solar Reflectance Index requirement.

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

C. 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.

1. Base flashings and built-up terminations.

2. Tapered insulation, including slopes.

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

D. Samples for Verification: For the following products:

1. Sheet roofing materials, of color specified for exposed material.

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:

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

a. Include: External fire resistance submittal.

2. 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 warranties.

D. 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.

1. Submit reports within 48 hours after installation.

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

1.6 CLOSEOUT SUBMITTALS

A. Maintenance Data: To include in maintenance manuals.

B. Warranties: Executed copies of warranties.

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

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

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

a. 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.

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

c. Samples of each component.

d. Sample submittal from similar project.

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

f. Sample warranty.

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

h. 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.

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

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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 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 end of each day.

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

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. Warranty Form: Manufacturer's standard warranty form.

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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. Soprema.

2. Garland.

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 2000 hours of exposure when tested according to ASTM G152, ASTM G154, or ASTM G155.

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.

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B. Flashings and Fastening: Provide base flashings, perimeter flashings, detail flashings and component materials and installation techniques that comply with 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 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.

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.

B. 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.

2.4 ROOF MEMBRANE MATERIALS

A. Base-Ply Sheet:

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

a. Basis of design product: Tremco, POWER ply Heavy Duty Base Sheet.

b. 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).

c. Elongation at 0 deg. F (-18 deg. C), minimum, ASTM D5147: Machine direction,

3.0 percent; Cross machine direction, 3.5 percent.

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

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

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f. Thickness, minimum, ASTM D5147: 0.120 inch (3.0 mm). B. SBS Modified

Bituminous Membrane Granule-Surfaced Cap Sheet:

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

a. Basis of design product: Tremco, POWER ply Plus HT FR.

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

c. 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).

d. 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).

e. Elongation at 77 deg. F (25 deg. C), minimum, ASTM D5147: Machine direction,

6.4 percent; Cross machine direction, 7.0 percent.

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

g. Thickness, minimum, ASTM D5147: 0.134 inch (3.4 mm). C. Flashing Backer

Sheet:

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

a. Basis of design product: Tremco, POWER ply Heavy Duty Base Sheet.

b. 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).

c. Elongation at 0 deg. F (-18 deg. C), minimum, ASTM D5147: Machine direction,

3.0 percent; Cross machine direction, 3.5 percent.

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

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

f. Thickness, minimum, ASTM D5147: 0.120 inch (3.0 mm). D. Flashing Sheet:

1. Flashing Sheet: Same as cap sheet.

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

E. Detailing Fabric:

1. 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.

a. Basis of design product: Tremco, BURmesh.

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

c. Color: Aqua green.

2.5 ASPHALT MATERIALS

A. Asphalt primer, water-based, polymer modified.

1. Basis of design product: Tremco, TREMprime WB.

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

3. Color: Brown/black.

B. Hot-melt asphalt adhesive, ASTM D312 Type IV.

1. Basis of design product: Tremco, Premium IV Adhesive.

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

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

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

2.6 AUXILIARY MEMBRANE ROOFING MATERIALS

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

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

B. Asphalt Roofing Cement / Mastic:

1. 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.

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a. Basis of design product: Tremco, ELS.

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

c. Non-Volatile Matter, ASTM D4586: 85 percent.

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

Reinforcing Fabric:

1. 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.

a. Basis of design product: Tremco, BURmesh.

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

c. Color: Aqua green.

D. 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.

E. Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosionresistance 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.

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

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

2.7 ROOF INSULATION MATERIALS

A. 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.

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

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

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

a. Basis of design product: Tremco, Trisotech Insulation.

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

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

mm) thick.

2.8 INSULATION ACCESSORIES

A. Roof Insulation Cover Board:

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 lbf/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. Hot-melt asphalt adhesive, ASTM D312 Type IV.

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a. Basis of design product: Tremco, Premium IV Adhesive.

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

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

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

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

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

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

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, blocking, curbs, and nailers are securely anchored to roof deck at penetrations and terminations and that nailers match thickness of insulation. wood cants

3. Verify that substrate is sound and dry.

4. Existing Concrete Roof Deck:

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

b. Verify adhesion of new roofing components to concrete.

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

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.

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

3.3 INSTALLATION, GENERAL

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

B. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system at the end of the workday or when rain is forecast.

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

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

3.4 ROOFING INSTALLATION DETAILS

A. 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.

3.5 INSULATION INSTALLATION

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

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

C. 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.

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

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

E. 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.

F. 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.

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1. Tapered Insulation System for Flat Roof Deck: Install insulation as follows:

Minimum total thickness of Continuous Insulation: 2 inches, subject to field verification.

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

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

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

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

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

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

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

2. 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 Equi viscous temperature.

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

J. 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.

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

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

3.6 HOT-APPLIED ROOFING MEMBRANE INSTALLATION, GENERAL

A. 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:

1. Base-Ply Sheet: One.

a. Adhering Method: Mopped.

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

a. Adhering Method: Mopped.

3. Granular-Surfaced SBS-Modified Asphalt Cap Sheet:

a. Adhering Method: Mopped.

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

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

D. 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.

1. 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.

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

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.

E. Hot Roofing Asphalt Heating: Heat asphalt to its Equi viscous temperature, measured at the mop cart or mechanical spreader immediately before application. Circulate asphalt during heating. Do not raise asphalt temperature above Equi viscous 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.

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

C).

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

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3.7 BASE-PLY SHEET INSTALLATION

A. 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:

1. Adhere to substrate in a solid mopping of hot roofing asphalt applied at not less than 425 deg.

F (218 deg. C).

3.8 SBS-MODIFIED BITUMINOUS MEMBRANE INSTALLATION

A. 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:

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

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

B. 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.

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

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

3.9 FLASHING AND STRIPPING INSTALLATION

A. 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:

1. 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.

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

3. Backer Sheet Installation:

a. 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.

4. Flashing Sheet Installation:

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a. 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.

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

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

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

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

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

D. 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.

E. 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.

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

3.10 WALKWAY INSTALLATION

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

1. Install walkways at following locations:

a. Where indicated on Drawings.

b. Perimeter of each rooftop unit.

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

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

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e. Top and bottom of each roof access ladder.

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

B. 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.

3.11 FIELD QUALITY CONTROL

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

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

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

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

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

3.12 PROTECTING AND CLEANING

A. Protect the 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 roofing system that does not comply with requirements, repair substrates, and repair or reinstall 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.

3.13 HVAC Vents

A. Replace two fresh air intake vents blown off in storm.

END OF SECTION 075216.11

3.13 Alternate 1

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Replace the main roof of Stevens with a SBS Modified Bituminous roof system, Hot Applied. Follow the specification as above.

Alternate 1:

Hazard Mitigation Opportunities (per FEMA Appendix J) Given the age of the facility and the nature of the tornado-related damage, the following Section 406 mitigation measures are recommended:

1. Wind-Resistant Roofing System• Replace with multi-layered, wind-rated roofing materials (e.g., modified bitumen with reinforced membranes). • Use enhanced adhesives and mechanical fasteners to meet or exceed IBC wind uplift standards.

2. Roof Deck Reinforcement• Upgrade underlying roof deck with thicker, moisture-resistant sheathing. • Improve anchorage to structural framing to reduce risk of detachment.

3. Protected Roof Ventilation• Install wind-rated intake vents with internal baffles and reinforced framing. • Consider low-profile or flush-mounted designs to reduce exposure.