WRITTEN SPECIFICATION.pdf

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DIVISION 07 - THERMAL AND MOISTURE PROTECTION

070150.74 Rehabilitation of Single Ply Roofing

Beal City Public Schools Beal City Schools Roof Renovation

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REHABILITATION OF SINGLE PLY ROOFING

SECTION 070150.74 - REHABILITATION OF SINGLE PLY ROOFING

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes the following:

1. Roof preparation.

2. Application of Fluid-applied membrane on fully adhered EPDM membrane roofing.

B. Related Requirements:

1. Division 00 Document "Available Information," including the following pre-construction test report attachments.

a. Infrared roof moisture survey report.

b. Construction Drawings for existing roofing system.

2. Division 01 Section "Summary" for use of the premises and phasing requirements, and for restrictions on use of the premises due to Owner or tenant occupancy.

3. Division 01 Section "Photographic Documentation" for photographs taken before coating preparation.

4. Division 01 Section "Temporary Facilities and Controls" for temporary construction and environmental protection measures.

5. Division 01 Section "Sustainable Design Requirements" for general requirements for sustainable design.

6. Division 07 Section "Preparation for Re-Roofing" for existing roofing tearoff, patching, and substrate preparation for rehabilitation of roofing membrane.

7. Division 07 Section "Maintenance Cleaning of Membrane Roofing" for reclaimed water cleaning system for preparation of existing roof substrate.

8. Division 07 Section "Sheet Metal Flashing and Trim" for formed metal roof flashings and counterflashings and shop-formed expansion joints.

9. Division 07 Section "Roof Specialties."

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10. Division 07 Section "Manufactured Roof Expansion Joints."

11. Division 23 Sections for HVAC equipment removal and reinstallation.

12. Division 26 Sections for electrical equipment disconnection and reconnection.

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

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

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

1.3 MATERIALS OWNERSHIP

A. Demolished materials shall become Contractor's property; remove demolished materials from Project site and dispose of legally.

1.4 DEFINITIONS

A. Roofing Terminology: Refer to ASTM D 1079 and glossary in NRCA's "The NRCA Roofing and Waterproofing Manual" for definition of terms related to roofing work in this Section.

B. Roofing Coating Preparation: Existing roofing that is to remain and be prepared to accept restorative coating application.

C. Patching: Removal of a portion of existing membrane roofing system from deck or removal of selected components and accessories from existing membrane roofing system and replacement with similar materials.

D. Remove: Detach items from existing construction and legally dispose of them off-site unless indicated to be removed and reinstalled.

E. Existing to Remain: Existing items of construction that are not indicated to be removed.

1.5 ACTION SUBMITTALS

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

B. Sustainable Design Submittals:

1. Indicate Energy Star compliance.

1.6 INFORMATIONAL SUBMITTALS

A. Contractor's Product Certificate: Submit notarized certificate, indicating products intended for Work of this Section, including product names and numbers and manufacturers? names, with

070150.74 - Page 3 of 13 statement indicating that products to be provided meet the requirements of the Contract Documents.

B. Product Test Reports: Based on evaluation of comprehensive tests performed by manufacturer and witnessed by a qualified testing agency, for components of roofing rehabilitation system.

C. Proposed Protection Measures: Submit report, including Drawings, that indicates the measures proposed for protecting individuals and property, for environmental protection, and for dust control. Indicate proposed locations and construction of barriers.

D. Warranties: Unexecuted sample copies of special warranties.

E. Qualification Data: For Installer and Manufacturer.

1. Letter written for this Project indicating manufacturer approval of Installer to apply specified products and provide specified warranty.

1.7 CLOSEOUT SUBMITTALS

A. Maintenance Data: To include in maintenance manuals.

B. Warranties: Executed copies of approved warranty forms.

1.8 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 the following:

1. Qualified by the manufacturer to install manufacturer's product and furnish warranty of type specified.

B. Manufacturer Qualifications: Approved manufacturer listed in this Section, with minimum five years' experience in manufacture of specified products in successful use in similar applications.

1. Approval of Other Manufacturers and 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 and Architect contact information.

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e. Sample warranty.

C. Roofing Rehabilitation Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section "Project Management and Coordination." Review methods and procedures related to roofing system.

1. Meet with Owner; roofing coating materials manufacturer's representative; roofing rehabilitation Installer including project manager and foreman; and installers whose work interfaces with or affects rehabilitation including installers of roof accessories and roof-mounted equipment requiring removal and replacement as part of the Work.

2. Review pre-construction test reports and other available information.

3. Review methods and procedures related to coating preparation, including manufacturer's written instructions.

4. Review temporary protection requirements for existing roofing system that is to remain uncoated, during and after installation.

5. Review roof drainage during each stage of coating and review roof drain plugging and plug removal procedures.

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

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

8. Review HVAC shutdown and sealing of air intakes.

9. Review shutdown of fire-suppression, -protection, and -alarm and -detection systems.

10. Review procedures for asbestos removal or unexpected discovery of asbestos-containing materials.

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

12. Review existing conditions that may require notification of Owner before proceeding.

1.9 PROJECT CONDITIONS

A. Weather Limitations: Proceed with rehabilitation work only when existing and forecasted weather conditions permit Work to proceed without water entering into existing roofing system or building.

1. Store all materials prior to application at temperatures between 60 and 90 deg. F.

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2. Apply fluid applied membranes within range of ambient and substrate temperatures recommended by manufacturer. Do not apply materials when air temperature is below 50 or above 110 deg. F.

3. Do not apply roofing in snow, rain, fog, or mist.

B. Protect building to be rehabilitated, adjacent buildings, walkways, site improvements, exterior plantings, and landscaping from damage or soiling from rehabilitation operations.

C. Maintain access to existing walkways, corridors, and other adjacent occupied or used facilities.

D. 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.

E. Owner will occupy portions of building immediately below working area. Conduct roofing so Owner's operations will not be disrupted. Provide Owner with not less than 72 hours' notice of activities that may affect Owner's operations.

1.10 WARRANTY

A. Manufacturer's Warranty for Roof Rehabilitation: Written warranty in which Manufacturer agrees to repair roof rehabilitation installations that fail due to defects in rehabilitation materials or workmanship within specified warranty period.

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

a. Rehabilitated membrane failures including rupturing or cracking due to a manufacturing or installation defect.

b. Deterioration of applied rehabilitation materials beyond normal weathering.

2. Limit of Warranty Coverage for Repair of Roof Rehabilitation: Not to exceed original purchase price of manufacturer's recoating materials, except that manufacturer may elect to apply the limit amount toward the following:

a. Purchase of a new replacement roof within the first five years following completion of rehabilitation work.

3. Qualified Installer Warranty Requirement: Installer must meet requirements of Quality Assurance Article.

4. Installation Inspection Warranty Requirement: By Roofing Inspector in accordance with requirements of Part 3 Field Quality Control Article.

5. Warranty Period: 12 years from date of Substantial Completion.

B. Manufacturer Inspection and Preventive Maintenance Requirement: By manufacturer's technical representative, to report maintenance responsibilities to Owner necessary for preservation of Owner's warranty rights. The cost of manufacturer's inspections and preventive maintenance is

070150.74 - Page 6 of 13 included in the Contract Sum. Inspections to occur in Years 2, 5 and 10 following date of Substantial Completion.

C. Installer's Warranty: Submit roofing Installer's warranty, on warranty form at end of this Section, signed by Installer, covering the Work of this Section, for the following warranty period:

1. Warranty Period: Two years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Basis-of-Design Manufacturer/Product: The roof system specified in this Section is based upon products of Tremco, Inc., Beachwood, OH, (800) 562-2728, www.tremcoroofing.com, that are named in other Part 2 articles. Provide named products.

2.2 PERFORMANCE REQUIREMENTS

A. General Performance: Rehabilitated roofing shall withstand exposure to weather without failure or leaks due to defective manufacture or installation.

1. Accelerated Weathering: Roofing system shall withstand 2000 hours of exposure when tested according to ASTM G 152, ASTM G 154, or ASTM G 155.

B. Material Compatibility: Provide roofing materials that are compatible with one another under conditions of service and application required, as demonstrated by roofing manufacturer based on testing and field experience.

C. Exterior Fire-Test Exposure: ASTM E 108, 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 E 1980 based on testing identical products by a qualified testing agency.

E. Solar Reflectance Index: Provide roof coating with solar reflectance index not less than 90 for not less than 75 percent of the roof surface, when calculated according to ASTM E 408 based on testing identical products by a qualified testing agency.

F. Energy Star Listing: Provide roof coating that is listed on the U.S. Department of Energy's ENERGY STAR Roof Products Qualified Product List for low-slope roof products.

G. Energy Performance: Provide roof panels with initial solar reflectance not less than 0.70 and emissivity not less than 0.75 when tested according to CRRC-1.

2.3 MATERIALS, GENERAL

A. General: Rehabilitation materials recommended by roofing system manufacturer for intended use and compatible with components of existing membrane roofing system.

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B. Infill Materials: Where required to replace test cores and to patch existing roofing, use infill materials matching existing membrane roofing system materials, unless otherwise indicated.

C. Temporary Roof Drainage: Design and selection of materials for temporary roof drainage are responsibilities of the Contractor.

2.4 FLUID_APPLIED POLYURETHANE

A. Polyurethane roof system base coat, low odor low VOC single-part moisture-curing, for use with a compatible top coat.

1. Basis of design product: Tremco, Geogard LO Base Coat.

2. Combustion Characteristics, UL 790: Class A, for two-coat system.

3. Volatile Organic Compounds (VOC), maximum, ASTM D 3960: Less than 50 g/L.

4. Accelerated Weathering, 5000 hours, ASTM G 154: Pass.

5. Hardness, Shore A, minimum, ASTM D 2240: 37.

6. Solids, by volume, ASTM D 2697: 94 percent.

B. Polyurethane roof system top coat, single-part, for application over compatible base coat.

1. Basis of design product: Tremco, Geogard Finish Coat.

2. Combustion Characteristics, UL 790: Class A, for two-coat system.

3. Volatile Organic Compounds (VOC), maximum, ASTM D 3960: Less than 250 g/L.

4. Solar Reflectance Index (SRI), ASTM E 1980: 105.

5. Accelerated Weathering, 5000 hours, ASTM G 154: Pass.

6. Hardness, Shore A, minimum, ASTM D 2240: 80.

7. Solids by volume, ASTM D 2697: 50 percent.

C. Primer for Intercoat and Substrate Adhesion: Single-part, quick-drying primer to promote adhesion of urethanes to previous urethane coats and to other approved surfaces..

1. Basis of design product: Tremco, Geogard Primer.

2. Volatile Organic Compounds (VOC), maximum, ASTM D3960: 5 g/L.

2.5 AUXILIARY ROOFING REHABILITATION MATERIALS

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

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B. Seam Sealer Mastic: Waterproof seam and patching material compatible with applied coating.

1. Elastomeric Seam Sealer: White, single-component high solids moisture curing aliphatic polyurethane sealant formulated for compatibility and use with specified roofing substrates..

a. Basis of design product: Tremco, GEOGARD Seam Sealer.

b. Volatile Organic Compounds (VOC), maximum, ASTM D 3960: 189 g/L.

c. Tensile Strength, ASTM D 412: 270 psi.

d. Tear Strength, ASTM D 412: 35 pli.

e. Elongation, ASTM D 412: 220 percent.

C. Seam Reinforcing Fabric:

1. Polyester Reinforcing Fabric: 100 percent stitch-bonded mildew-resistant polyester fabric intended for reinforcement of compatible fluid-applied membranes and flashings.

a. Basis of design product: Tremco, Permafab.

b. Tensile Strength, ASTM D 1682: Not less than 50 lbf. (222 N).

c. Elongation, ASTM D 1682: Not less than 60 percent.

d. Tear Strength, ASTM D 1117: Not less than 16 lbf. (70 N).

e. Weight: 3 oz./sq. yd (102 g/sq. m).

D. Joint Sealant: Elastomeric joint sealant compatible with applied coating, with movement capability appropriate for application.

1. Joint Sealant, Polyurethane: ASTM C 920, 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 D 3960: 40 g/L.

c. Hardness, Shore A, ASTM C 661: 40.

d. Adhesion to Concrete, ASTM C 794: 35 pli.

e. Tensile Strength, ASTM D 412: 350 psi.

f. Color: Closest match to substrate.

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E. Metal Flashing Sheet: Provide metal flashing sheet matching type, thickness, finish, and profile of existing metal flashing and trim.

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

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine existing roofing substrates, with Installer present, for compliance with requirements and for other conditions affecting application and performance of roof coatings

1. For the record, prepare written report, endorsed by Installer, listing conditions detrimental to performance.

2. Verify compatibility with and suitability of substrates.

3. Verify that substrates are visibly dry and free of moisture.

4. Verify that roofing membrane surfaces have adequately aged to enable proper bond with base coat.

5. Verify that roofing membrane is free of blisters, splits, open laps, indications of shrinkage, and puncture damage or other indications of impending roof system failure.

6. Application of fluid-applied membrane indicates acceptance of surfaces and conditions.

3.2 PREPARATION

A. Protect existing roofing system that is indicated not to be rehabilitated, and adjacent portions of building and building equipment.

1. Comply with warranty requirements of existing roof membrane manufacturer.

2. Limit traffic and material storage to areas of existing roofing membrane that have been protected.

3. Maintain temporary protection and leave in place until replacement roofing has been completed.

B. Shut down air intake equipment in the vicinity of the Work in coordination with the Owner.

Cover air intake louvers before proceeding with coating work that could affect indoor air quality or activate smoke detectors in the ductwork.

1. Verify that rooftop utilities and service piping affected by the Work have been shut off before commencing Work.

C. Maintain roof drains in functioning condition to ensure roof drainage at end of each workday.

Prevent debris from entering or blocking roof drains and conductors. Use roof-drain plugs

070150.74 - Page 10 of 13 specifically designed for this purpose. Remove roof-drain plugs at end of each workday, when no work is taking place, or when rain is forecast.

1. Do not permit water to enter into or under existing membrane roofing system components that are to remain.

3.3 ROOFING PREPARATION

A. Membrane Surface Preparation:

1. Remove blisters, ridges, buckles, roofing membrane fastener buttons projecting above the membrane, and other substrate irregularities from existing roofing membrane that would inhibit application of uniform, waterproof membrane.

2. Broom clean existing substrate.

3. Substrate Cleaning: Clean substrate in accordance with requirements of Section

070150.16 "Maintenance Cleaning of Membrane Roofing."

4. Substrate Cleaning: Clean substrate of contaminants such as dirt, debris, oil, and grease that can affect adhesion of coating by power washing at maximum 2,000 psi.

a. Dispose of waste water in accordance with requirements of authorities having jurisdiction.

5. Verify that existing substrate is dry before proceeding with application of coating. Spot check substrates with an electrical capacitance moisture-detection meter.

6. Verify adhesion of coatings to prepared substrate.

B. Existing Sheet Metal Flashing and Trim Preparation: Repair flashings, gravel stops, copings, and other roof-related sheet metal and trim elements. Reseal joints, replace loose or missing fasteners, and replace components where required to leave in a watertight condition.

1. Do not damage metal counterflashings that are to remain. Replace metal counterflashings damaged during removal with counterflashings of same metal, weight or thickness, and finish.

2. Roof Drains: Remove drain strainer and clamping ring. Grind metal surfaces down to clean, bare, metal.

C. Surface Priming: Prime surfaces to receive fluid-applied membrane using manufacturer's recommended primer for substrate. Apply at application rate recommended by manufacturer.

1. Ensure primer does not puddle and substrate has complete coverage.

2. Allow to cure completely prior to application of fluid-applied membrane.

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3.4 POLYURETHANE ROOF COATING APPLICATION

A. Detail Course Application: Reinforce horizontal and vertical seams with detail course of base coat according to manufacturer's written instructions at a minimum 6 inches (150 mm) wide applied at 3.0 gal/100 sq. ft. (1.2 L/sq. m) minimum. Embed seam reinforcement fabric over adhered seams.

B. Base Coat: Once detail coat has adequately cured, apply base coat according to manufacturer's written instructions by direct pour and roller, as follows:

1. Base Coat Application Minimum Thickness: Apply in one coat application of 16 wet mills

C. Finish Coat: Once base coat has adequately cured, apply finish coat according to manufacturer's written instructions, by direct pour and roller, as follows:

1. Application Thickness, Finish Coat: Apply in one coat application of 16 wet mills.

3.5 PROTECTING AND CLEANING

A. Protect roofing system from damage and wear during remainder of construction period.

B. Correct deficiencies in or remove coating that does not comply with requirements, repair substrates, and reapply coating.

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

3.6 ROOFING INSTALLER'S WARRANTY

A. WHEREAS _____________________________________ of _______________________, herein called the "Roofing Installer," has performed roofing and associated work ("work") on the following project:

1. Owner:

2. Address:

3. Building Name/Type:

4. Address:

5. Area of Work:

6. Acceptance Date:

7. Warranty Period:

8. Expiration Date:

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B. AND WHEREAS Roofing Installer has contracted (either directly with Owner or indirectly as a subcontractor) to warrant said work against leaks and faulty or defective materials and workmanship for designated Warranty Period, C. NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that during Warranty Period he will, at his own cost and expense, make or cause to be made such repairs to or replacements of said work as are necessary to correct faulty and defective work and as are necessary to maintain said work in a watertight condition.

D. This Warranty is made subject to the following terms and conditions:

1. Specifically excluded from this Warranty are damages to work and other parts of the building, and to building contents, caused by:

a. lightning;

b. peak gust wind speed exceeding 74 mph (120 k/hr);

c. fire;

d. failure of rehabilitation roofing system substrate, including cracking, settlement, excessive deflection, deterioration, and decomposition;

e. faulty construction of parapet walls, copings, chimneys, skylights, vents, equipment supports, and other edge conditions and penetrations of the work;

f. vapor condensation on bottom of roofing; and

g. activity on roofing by others, including construction contractors, maintenance personnel, other persons, and animals, whether authorized or unauthorized by Owner.

2. When work has been damaged by any of foregoing causes, Warranty shall be null and void until such damage has been repaired by Roofing Installer and until cost and expense thereof have been paid by Owner or by another responsible party so designated.

3. Roofing Installer is responsible for damage to work covered by this Warranty but is not liable for consequential damages to building or building contents resulting from leaks or faults or defects of work.

4. During Warranty Period, if Owner allows alteration of work by anyone other than Roofing Installer, including cutting, patching, and maintenance in connection with penetrations, attachment of other work, and positioning of anything on roof, this Warranty shall become null and void on date of said alterations, but only to the extent said alterations affect work covered by this Warranty. If Owner engages Roofing Installer to perform said alterations, Warranty shall not become null and void unless Roofing Installer, before starting said work, shall have notified Owner in writing, showing reasonable cause for claim, that said alterations would likely damage or deteriorate work, thereby reasonably justifying a limitation or termination of this Warranty.

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5. During Warranty Period, if original use of roof is changed and it becomes used for, but was not originally specified for, a promenade, work deck, spray-cooled surface, flooded basin, or other use or service more severe than originally specified, this Warranty shall become null and void on date of said change, but only to the extent said change affects work covered by this Warranty.

6. Owner shall promptly notify Roofing Installer of observed, known, or suspected leaks, defects, or deterioration and shall afford reasonable opportunity for Roofing Installer to inspect work and to examine evidence of such leaks, defects, or deterioration.

7. This Warranty is recognized to be the only warranty of Roofing Installer on said work and shall not operate to restrict or cut off Owner from other remedies and resources lawfully available to Owner in cases of roofing failure. Specifically, this Warranty shall not operate to relieve Roofing Installer of responsibility for performance of original work according to requirements of the Contract Documents, regardless of whether Contract was a contract directly with Owner or a subcontract with Owner's General Contractor.

E. IN WITNESS THEREOF, this instrument has been duly executed by:

1. Authorized Signature:

2. Name:

3. Date:

END OF SECTION 070150.74