075419_pvc_membrane_roofing_new_add02.pdf

General Services Administration Bid Set Phillip Burton FB Infrastructure Project 450 Golden Gate Ave., San Francisco, CA Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 1

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

SECTION 075419 – PVC MEMBRANE ROOFING, Addendum 02

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. The Government is providing the references included in this sub-section for information purposes only and is not intended to provide a comprehensive, all-inclusive list of any and all potentially relevant portions of the Contract Documents. Drawings and general provisions of the Contract and other Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes:

1. Fully adhered felt-back PVC membrane roofing system.

B. Related Sections:

1. Section 076200 "Sheet Metal Flashing and Trim" for metal roof penetration flashings, flashings and counterflashings.

2. Section 079200 "Joint Sealers" for joint sealants, joint fillers, and joint preparation.

1.3 DEFINITIONS

A. PVC: Poly-vinyl Chloride.

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

1.4 REFERENCE STANDARDS

A. ASCE 7 - Minimum Design Loads for Buildings and Other Structures; 2011.

B. ASTM C 1177/C1177M - Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing; 2013.

C. ASTM D 4263 - Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method; 2015.

D. ASTM D 4434/D 4434M - Standard Specification for Poly(Vinyl Chloride) Sheet Roofing; 2012.

E. ASTM E 1980 - Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces; 2011.

F. ASTM F 1869 - Standard Test Method for Measuring Moisture Vapor Emission Rate of Concrete Subfloor Using Anhydrous Calcium Chloride; 2011.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 2

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

G. ASTM F 2170 - Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes.

H. NRCA ML104 - The NRCA Roofing and Waterproofing Manual; National Roofing Contractors Association; Fifth Edition, with interim updates.

I. UL (RMSD) - Roofing Materials and Systems Directory; Underwriters Laboratories Inc.; current edition.

J. UL (FRD) - Fire Resistance Directory; Underwriters Laboratories Inc.; current edition.

K. UL 790 - Standard for Standard Test Methods for Fire Tests of Roof Coverings; Current Edition, Including All Revisions.

1.5 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.

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

C. Roofing system shall comply with the California Building Code.

D. The new roof system shall comply with all mandatory requirements under the California Green Building Standards as listed under Title 24 Part 11.

E. Roofing system design: Provide membrane roofing system that is identical to systems that have been successfully tested by a qualified testing and inspecting agency to resist uplift pressure calculated according to ASCE/SEI 7.

F. Solar Reflectance Index (SRI): Not less than 82 when calculated according to ASTM E 1980, based on testing identical products by a qualified testing agency.

1.6 PRECONSTRUCTION TESTING

A. Preconstruction field testing: Before installing roof membrane and accessories, field test for moisture vapor transmission rate of concrete substrate as follows:

1. Locate tests where indicated on Project or, if not indicated, as directed by Contracting

Officer.

2. Conduct 6 field tests of each type indicated below.

3. Notify Contracting Officer 7 days in advance of dates and times when tests will be conducted.

4. Arrange for tests to take place with roofing system manufacturer's technical representative present.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 3

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

a. Test methods:

1) Shovel test:

a) With all loose materials removed, prepare deck and apply the adhesive in ribbons to the surface to adhere the roof board.

b) Allow the adhesive to cure per manufacturer’s recommendations.

c) After adhesive has cured, insert a flat shovel into the corner of the roof board and pry up on the roof board.

d) If the roof board breaks, the test result is considered a pass.

e) If the roof board de-bonds from the deck, the test result is considered a fail.

5. Report the qualitative results to the Contracting Officer.

6. Evaluation of Preconstruction Field-Test results: Consult with the Contracting Officer to determine whether or not the concrete substrate is acceptable to receive roofing membrane, or if slab requires installation of roofing system manufacturer's vapor retarder.

B. Preconstruction Field Survey: Before installing roof membrane and accessories, survey the MAIN roof as follows:

1. After removing roof membrane, survey the concrete substrate at the perimeter of the

MAIN roof where indicated on roof plans, or as directed by Contracting Officer.

2. Identify locations where no slope or negative slope to drain exists.

1.7 ACTION SUBMITTALS

A. Product data: Submit data for each type of product specified. Include data substantiating that materials comply with requirements, manufacturer's written instructions for evaluating, preparing and treating substrate, technical data and tested physical and performance properties.

1. Include Material Safety Data Sheets, if applicable.

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

1. Base flashings and membrane terminations.

2. Roof plan showing orientation of roof deck and orientation of membrane roofing and fastening spacings and patterns for mechanically fastened membrane roofing.

C. Samples:

1. For the following products:

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

b. Walkway pads or rolls.

c. Metal termination bars.

1.8 INFORMATIONAL SUBMITTALS

A. Qualification data: Submit Qualification Data of firms and persons specified in the “Quality Assurance” Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of Architects and Owners, and other information.

1. For products required to be installed by workers approved by product manufacturer, include letters of acceptance by product manufacturers certifying that Installers are approved to apply their products.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 4

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

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

1. Submit evidence of compliance with performance requirements.

C. Installer certificates: Signed by manufacturer certifying that Installers comply with requirements.

D. Product test reports: Based on evaluation of comprehensive tests performed by manufacturer and witnessed by a qualified testing agency, for components of membrane roofing system.

E. Submit manufacturer’s certification of products subject to VOC compliance that products supplied comply with local regulations controlling use of volatile organic compounds (VOCs).

F. Research/Evaluation Reports: For components of membrane roofing system, from the ICC-ES.

G. Field quality-control reports.

H. Warranties: Sample of special warranties.

1.9 CLOSEOUT SUBMITTALS

A. Maintenance data: To include in maintenance manuals. Identify substrates and types of products applied. Include recommendations for periodic inspections, cleaning, care, maintenance and repair.

1.10 QUALITY ASSURANCE

A. Membrane manufacturer qualification: Manufacturer shall demonstrate qualifications to supply materials of this Section by certifying the following:

1. Membrane manufacturer must show evidence that the specified product has been manufactured by the same source for no less than the warranty duration, in years.

2. Membrane manufacturer must not issue warranties for terms longer than they have been manufacturing their membrane.

3. Membrane manufacturer shall have available an in-house technical staff to assist the

Contractor, when necessary, in application of the products and final inspection of the assembly at no additional cost.

4. Membrane manufacturer shall submit the following certifications for review:

a. Substrates and conditions are acceptable for purposes of providing specified warranty.

b. Materials supplied shall meet the specified requirements.

B. Installer qualifications: Engage an experienced Installer to perform Work of this Section who has specialized in installing the specified product; who is approved, authorized, or licensed by the system manufacturer to install manufacturer's product; and who is eligible to receive the standard manufacturer's warranty.

1. Company specializing in performing the Work of this Section with minimum 5 years of experience.

2. Applicator shall submit documentation from the membrane manufacturer to verify

Contractor’s status as a locally based, approved applicator for warranted installations of the product the Installer intends to use.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 5

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

3. Workers: Thoroughly skilled and specially trained in the techniques applying the specified product. Applicators shall be able to demonstrate acceptable level of skill for review and acceptance by the Contracting Officer.

C. Source limitations: Obtain components including fasteners, flashings, and accessories for membrane roofing system through one source from a single manufacturer.

D. Preinstallation roofing conference: Conduct conference at project site.

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

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

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

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

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

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

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

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

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

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

D. Remove all materials, including cloths, tarps, and empty containers from the area of Work at the close of each day

1.12 REGULATORY REQUIREMENTS

A. Conform to applicable Federal, State, and local regulatory requirements including flame and smoke rating requirements for finishes.

B. Comply with requirements of OSHA, NIOSH or local governing authority for work place safety.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 6

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

C. Comply with authority or agency “Confined Space Policy” during and throughout all Work to be performed.

D. Flammable Liquids serve all current regulation regarding flammable liquids such as posting “No Smoking” signs. Allow no open flames, welding, or other ignition sources in the Work.

E. Conform to all applicable Laws, Codes, and Regulations for disposal of all materials, debris, and containers.

F. Materials shall be VOC Compliant.

1.13 PROJECT CONDITIONS

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

1.14 COORDINATION AND PROTECTION

A. Coordinate the Work with the installation of associated metal flashings, accessories, appurtenances, etc. as the Work of this Section proceeds.

B. Building components shall be protected adequately (with tarp or other suitable material) from soil, stains, or spills at all hoisting points and areas of application. Contractor shall be responsible for preventing damage from any operation under its Contract. Any such damage shall be repaired at Contractor's expense to Government's satisfaction or be restored to original condition.

C. Provide barricades, retaining ropes, safety elements (active/passive) and any appropriate signage required by OSHA, NIOSH, and NSC and/or the Government or designated Representative.

D. Protect finished roofing/waterproofing membrane from damage by other trades.

1.15 WARRANTY

A. General: Special warranty specified in this Article shall not deprive Government of other rights Government may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by Contractor under requirements of the Contract Documents.

B. Special warranty: Manufacturer's standard or customized form, without monetary limitation, in which manufacturer agrees to repair or replace components of membrane roofing system that fail in materials or workmanship within specified warranty period.

1. Special warranty includes membrane roofing, base flashings, fasteners, cover boards, and roofing accessories and other components of membrane roofing system.

2. Warranty period: 20 years from date of Substantial Completion.

C. Special project warranty: Submit roofing Installer's warranty, on warranty form at end of this Section, signed by Installer, covering the Work of this Section, including all components of

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 7

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

membrane roofing system such as membrane roofing, base flashing, roof insulation, fasteners, cover boards, substrate boards, vapor retarders, roof pavers, and walkway products, for the following warranty period:

1. Warranty period: 2 years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 GENERAL

A. The products herein specified are pre-engineered products of the listed manufacturer and establish criteria for the approval of substitutions. Products must be part of a pre-engineered system, equivalent in function, quality, composition and method of application to be considered for approval as an "Approved Substitute". Substitute materials must meet or exceed the physical performance characteristics of the specified materials.

2.2 PVC MEMBRANE ROOFING

A. PVC Sheet: ASTM D 4434, Type II or III, fabric reinforced, with a factory applied felt backing.

1. Products: Subject to compliance with requirements, provide Sentinel PVC P200 HFB by

Soprema.

2. Thickness: 80 mils, nominal.

3. Exposed face color: white Gray.

2.3 AUXILIARY MEMBRANE 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 BAAQMD.

B. Flashings:

1. Sheet flashing: Manufacturer's standard sheet flashing of same material, type, reinforcement, thickness, and color as PVC sheet membrane.

a. Products: Subject to compliance with requirements, provide Sentinel PVC P200 by Soprema.

2. Fluid-applied flashing system: Liquid-applied, catalyzed polymethyl methacrylate

(PMMA) flashing resin, fully reinforced with a non-woven polyester fleece, installed over a prepared or primed substrate. Use of specialty flashing system shall be specifically approved in advance by the membrane manufacturer for each application.

a. Products: Subject to compliance with requirements, provide Alsan RS 230

Flashing System by Soprema.

3. PVC coated rigid flashing: Manufacturer's standard PVC-coated, heat-weldable sheet metal capable of being formed into a variety of shapes and profiles. 24 gauge, G90 galvanized metal sheet with a 20 mil unsupported membrane of same material, type, and color as PVC sheet membrane laminated on one side.

a. Products: Subject to compliance with requirements, provide Sentinel Vinyl Coated

Metal by Soprema.

4. Sheet metal flashing: Refer to Section 076200 - Sheet Metal Flashing and Trim.

C. Bonding adhesive: Manufacturer's standard water-based adhesive.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 8

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

D. Slip Sheet: Manufacturer's standard, of thickness required for application.

E. Metal termination bars: Manufacturer's standard, predrilled stainless-steel or aluminum bars, approximately 1 x 1/8 inch thick; with anchors.

F. Metal battens: Manufacturer's standard, aluminum-zinc-alloy-coated or zinc-coated steel sheet, approximately 1 inch wide x 0.05 inch thick, prepunched.

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

H. Elastomeric sealant: ASTM C 920, elastomeric polymer sealant; of type, grade, class, and use classifications required to seal joints in roof membrane assembly and remain watertight. As recommended by manufacturer.

I. Mortar materials:

1. Mortar materials for curbs: Portland Cement; ASTM C 150, Type I or II, except Type III may be used for cold-weather construction.

2. Polymer-modified, cementitious sloping mortar: One- or two-component, factory-mixed, fast-setting, polymer-modified cementitious non-sag mortar for leveling or sloping areas of ponding water.

a. Products: Subject to compliance with requirements; provide Sopraslope by

Soprema.

J. 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 as required by the manufacturer for a complete roofing assembly.

1. Products: Subject to compliance with requirements, miscellaneous accessory products include, but are not limited to, the following:

a. Injection Molded Corner: Molded Outside Corner by Soprema.

b. Injection Molded Corner: Molded Inside Corner by Soprema.

c. Prefabricated Outside Corner: Prefabricated Outside Corner by Soprema.

d. Prefabricated Inside Corner: Prefabricated Inside Corner by Soprema.

e. 4.5 in Round T-Joint Patch: T-Joint Patch by Soprema.

f. Prefabricated PVC pipe flashing: Sentinel PVC Pipe Flashing by Soprema.

g. Butyl tape at termination of PVC flashing membrane under coping at curbs: Butyl

Seal Tape by Soprema.

2.4 SUBSTRATE BOARDS

A. Substrate Board: ASTM C 1177/C 1177M, glass-mat, water-resistant gypsum substrate, 1/4 inch thick.

1. Products: Subject to compliance with requirements, provide DEXcell FA Glass Mat Roof

Board by National Gypsum Company.

B. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Approvals 4470, designed for fastening substrate board to roof deck.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 9

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

C. Full-Spread Applied Adhesive: Manufacturer's recommended spray-applied, low-rise, two-component urethane adhesive formulated to attach substrate board or insulation to substrate.

1. Products: Subject to compliance with requirements, provide Duotack by Soprema.

2.5 VAPOR RETARDER - BID OPTION 3A

A. Self-Adhering Sheet Vapor Retarder: ASTM D 1970, minimum of 32 mil thick, polyethylene film laminated to layer of rubberized asphalt adhesive; maximum permeance rating of 0.1 perm; cold applied, with slip-resisting surface and release paper backing. Provide primer when recommended by vapor-retarder manufacturer.

1. Products: Subject to compliance with requirements, provide Sopravap'r by Soprema.

2.6 WALKWAYS

A. Flexible Walkways: Factory-formed, nonporous, heavy-duty, slip-resisting, surface-textured walkway pads or rolls, and acceptable to membrane roofing system manufacturer.

1. Products: Subject to compliance with requirements, provide Sentinel Walkway Pad by

Soprema.

2. Exposed face color: Gray.

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 the substrate is free of defects such as excessive surface roughness, contamination, structural inadequacy, or any other condition that will adversely affect the quality of work.

2. 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.

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

4. Verify that concrete curing compounds that will impair adhesion of roofing components to roof deck have been removed.

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

3.2 PREPARATION

A. Clean and prepare substrate according to Manufacturer's written instructions. Provide clean, dust-free, and dry substrate for roofing application. Thoroughly sweep the substrate, which is to receive the roofing membrane.

1. Contractor shall determine the condition of the existing structural deck/substrate. All defects in the deck or substrate shall be corrected before new roofing work commences.

Areas of deteriorated deck/substrate, porous or other affected materials must be removed and replaced with new to match existing.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 10

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

2. Where no slope or negative slopes to drain exist per the preconstruction roof survey, re-slope existing crickets with polymer-modified, cementitious sloping mortar to create positive, smooth slopes to drain. Ensure sloping mortar has fully cured per roofing manufacturer’s requirements prior to installing roofing membrane.

3. 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.

4. 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.

5. Remove all ponded water, snow, frost and/or ice from the work substrate prior to installing new waterproofing materials.

6. The final substrate for waterproofing shall be clean, dry, smooth, free of loose, spalled or weak material including coatings, mineral aggregate, and flood coat/gravel surfacing, oil, grease, contaminants, abrupt changes in level, waterproofing agents, curing compounds, and free of projections which could damage membrane materials.

B. Other flashing surfaces: Remove all contaminants as required by membrane manufacturer.

Surface preparation shall be performed by means approved by Government or his designated representative.

3.3 SUBSTRATE BOARD

A. Install substrate board with long joints in continuous straight lines, perpendicular to roof slopes with end joints staggered between rows. Tightly butt substrate boards together.

1. Adhere substrate board to roof deck to resist uplift pressure at corners, perimeter, and field of roof according to membrane roofing system manufacturers' written instructions.

3.4 VAPOR-RETARDER INSTALLATION

A. Self-adhered sheet:

1. Upon removing the release film from the underside, apply a weighted roller to the top surface to ensure vapor retarder is fully bonded to the substrate, and along all side-laps and 6 in end-laps. Use a hand-roller and firm pressure, roll-in vertical flashings and confined areas.

2. Install vapor retarder to flash roof penetrations, terminations and transitions. Ensure minimum 3 in. side laps and 6 in. end laps are maintained. Flash vertical surfaces as required to seal all substrates.

3. Seal vapor retarder at all roof penetrations, transitions and terminations. Seal as necessary and apply specified general purpose sealant as needed to seal leading edges.

4. Seal irregular shaped or confined roof penetrations such as I-beams, C-channel, small pipes, etc. using specified liquid-applied flashing per the manufacturer’s instructions.

5. Examine adhesion of vapor retarder to ensure results remain satisfactory as project conditions vary.

6. Each day, physically inspect all side and end-laps, and ensure the membrane is sealed watertight.

7. Inspect the installation each day to ensure the plies are fully adhered. Repair all un-adhered voids, wrinkles, open laps and all other deficiencies.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 11

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

3.5 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. Bonding adhesive: Apply to substrate and underside of membrane roofing at rate required by manufacturer and allow to partially dry before installing membrane roofing. Do not apply to splice area of membrane roofing.

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. 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. Welding equipment shall be provided by or approved by the manufacturer. All mechanics intending to use the equipment shall have successfully completed a training course provided by a manufacturer’s Technical Service Representative prior to welding.

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

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

4. Repair tears, voids, and lapped seams in roofing that does 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.

3.6 FLASHING INSTALLATION

A. All flashings shall be installed concurrently with the roof membrane as the job progresses. No temporary flashings shall be allowed without the prior written approval of the Government's Representative and the manufacturer. Approval shall only be for specific locations on specific dates. If any water is allowed to enter under the newly completed roofing, the affected area shall be removed and replaced at the Applicator's expense. Flashing shall be adhered to compatible, dry, smooth, and solvent-resistant surfaces. Use caution to ensure adhesive fumes are not drawn into the building.

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

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

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

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 12

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

E. 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.

F. Terminate and seal top of sheet flashings and mechanically anchor to substrate through termination bars.

G. Resin Flashing System: Install the liquid-applied primer and flashing system in accordance with the membrane system manufacturer’s printed installer’s guidelines and other applicable written recommendations as provided by the manufacturer.

H. PVC clad metal flashings shall be formed and installed per the manufacturer’s recommendations.

1. All metal flashings shall be fastened into solid wood nailers with two rows of post galvanized flat head annular ring nails, 4 in. on center staggered. Fasteners shall penetrate the nailer a minimum of 1 in.

2. Metal shall be installed to provide adequate resistance to bending and allow for normal thermal expansion and contraction.

3. Adjacent sheets of PVC clad metal flashing shall be spaced 1/4 in. apart. The joint shall be covered with 2 in. wide aluminum tape. A 4 in. minimum wide strip of flashing membrane shall be hot-air welded over the joint. Exercise caution at perimeter of roof.

3.7 WALKWAY INSTALLATION

A. Flexible walkways: Install walkway products in locations indicated. Heat weld to substrate or adhere walkway products to substrate with compatible adhesive according to roofing system manufacturer's written instructions.

1. Roofing membrane to receive walkway shall be clean and dry. Place chalk lines on deck sheet to indicate location of walkway.

2. Apply a continuous coat of adhesive to the deck sheet and the back of walkway in accordance with the manufacturer’s technical requirements and press into place with minimum 100 lb. steel, membrane roller, by rolling in two directions.

3. Clean the deck membrane in areas to be welded. Hot-air weld the entire perimeter of the walkway to the roofing deck sheet. Check all welds with a probe. Re-weld any inconsistencies.

a. Check all existing deck membrane seams that are to be covered by walkway with a probe and re-weld any inconsistencies before walkway installation.

3.8 FIELD QUALITY CONTROL

A. Final roof inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation on completion.

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

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

D. Engage independent Installation and Testing Firm to perform membrane integrity testing, electronic field vector mapping (EFVM). Perform testing in accordance with membrane integrity test system manufacturer's recommendations.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) PVC MEMBRANE ROOFING

PROPERTY OF UNITED STATES GOVERNMENT 075419 - 13

FOR OFFICIAL USE ONLY ADDENDUM 02 - 05/06/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

1. Perform testing following adequate precipitation or wet membrane adequately to enable accurate testing.

2. Identify locations of membrane leaks; record locations and document with photographs.

Submit test reports to Contracting Officer.

3. Confirm completed repair of identified leaks and retest to verify water tightness of membrane.

4. Membrane integrity test System: Conductor cable, placed on top of membrane, delivering direct current tension to membrane surface, enabling inspection and isolation of points of moisture infiltration through membrane to conductive substrate under membrane.

5. Initial Membrane Test: Perform initial membrane integrity test upon completion of membrane and integrity test system installation and prior to installation of membrane over-burden.

6. Final Testing: Repeat membrane integrity test if roof assembly is exposed to traffic or construction operations prior to Substantial Completion.

7. Installing and Testing Firm Qualifications: Engage an independent testing agency to observe and conduct membrane integrity test and provide reports indicating testing procedure, methodology and results. Testing firm to have a minimum 5 year record of satisfactory experience.

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 Contracting Officer and Government.

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 manufacturer of affected construction.

3.10 CLOSEOUT

A. Correction of Work: Work that does not conform to specified requirements including tolerances, slopes, and finishes shall be corrected and/or replaced. Any deficiencies of membrane application, termination and/or protection as noted during the membrane manufacturer’s inspections shall be corrected and/or replaced at Contractor’s expense.

END OF SECTION 075419