Section07543 RoofRestoration.doc

Solicitation No.AG-95CV-S-09-0020 Recovery – Replace or Repair/Resurface Roofs, Main Bldg

(N.Wing), WAB, & Service Bldg, WRRC, Albany, CA

SECTION 07543 – ROOF RESTORATION WITH TITLE 24, ‘ENERGY STAR’ COATING SYSTEM

(Section applies to Main Building (North Wing), WAB (Directors Wing), and Service Building roofs)

PART 1 GENERAL

1.1

RELATED DOCUMENTS

A.

General provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

B.

“Supplemental Information – Main Building (North Wing) Roof,” “Supplemental Information – WAB (Directors Wing) Roof,” and “Supplemental Information – Service Building Roof” apply to this Section.

1.2

SUMMARY

A.

This Section includes the following:

1.

Use of powerwashing equipment/compressed air to remove all non-adhered aggregate and non-adhered materials.

2.

Re-working of all roof penetrations, projections, and drains.

3.

Addressing all flashings at curbs and walls. Repair flashings which affect the watertight integrity of the existing roofing system. Clean and coat all exposed base flashings with ‘cool roof’ coating at the rate of two (2) gallons per 100 square feet.

4.

Repairing all roof membrane defects which affect the watertight integrity of the existing roofing system.

5.

Caulking – Check all caulking on terminations and flashings and replace defective caulking with new.

6.

Gravelstop Joints – Spud clean to roof membrane. Install six (6) inch wide strip of composite ply set in fibrated mastic over joint.

7.

Walkpads – Remove prior to roof work. Set aside for re-use. Re-install to original locations upon completion of roof work.

8.

Prime entire field of roof at the rate of ½ gallon per 100 square feet.

9.

Apply rubberized emulsion and reinforcing mat over entire field of roof.

10.

Apply ‘cool roof’ white coating over entire field of roof.

1.3

DEFINITIONS

A.

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

B.

Cold-Applied Built-Up Roofing: An asbestos-free formulation of asphalt, solvent, thixotrope, mineral stabilizer, and reinforcing fibers used as an interply adhesive.

1.4

PERFORMANCE REQUIREMENTS

A.

General: Provide installed roofing membrane and base flashings that remain watertight; do not permit the passage of water; and resist specified uplift pressures, thermally induced movement, and exposure to weather without failure.

B.

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

C.

Fire Rating Classification: UL Class A.

1.5

SUBMITTALS

A.

Product Data: Provide for each type of product indicated.

B.

Samples for Verification, for the following products:

1.

12-by-12-inch square of trilaminate reinforced ply sheet.

2.

12-by-12-inch square of flashing sheet.

3.

One (1) quart of ‘cool roof’ coating.

C.

Installer Certificates: Signed by roofing system manufacturer, certifying that Installer is approved, authorized, or licensed by manufacturer to install roofing system.

D.

Manufacturer Certificates: Signed by roofing manufacturer, certifying that roofing system complies with requirements specified in Article 1.4, “Performance Requirements.”

1.

Submit evidence of meeting performance requirements.

E.

Qualification Data: For Installer and manufacturer.

F.

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

1.

Indicate that bulk roofing asphalt materials delivered to Project site comply with requirements. Include quantity and statistical and descriptive data for each product. Submit certificate with each load before it is used.

2.

Include continuous log showing time and temperature for each load of bulk asphalt, indicating date obtained from manufacturer, where held, and how transported before final heating and application on roof.

G.

Research/Evaluation Reports: For components of roofing system.

H.

Maintenance Data: For roofing system, include in maintenance manuals.

I.

Warranties: As specified in this Section. Provide 3ea. copies of unexecuted warranties for Government review and approval. Upon project Final Acceptance, provide 3ea. copies of executed warranties.

J.

Inspection Report: Copy of roofing system manufacturer's inspection report of completed roofing installation.

1.6

QUALITY ASSURANCE

A.

Installer Qualifications: A qualified firm that is approved, authorized, or licensed by roofing system manufacturer to install manufacturer's product and that is eligible to receive manufacturer's warranty.

B.

Manufacturer Qualifications: A qualified manufacturer that has UL listing and FMG approval for roofing system identical to that used for this Project.

C.

Testing Agency Qualifications: An independent testing agency with the experience and capability to conduct the testing indicated, as documented according to ASTM E 548.

D.

Source Limitations: Obtain components for roofing system from, or approved by, roofing system manufacturer.

E.

Fire-Test-Response Characteristics: Provide roofing materials with the fire-test-response characteristics indicated as determined by testing identical products per test method below by UL, FMG, or another testing and inspecting agency acceptable to authorities having jurisdiction. Materials shall be identified with appropriate markings of applicable testing and inspecting agency.

1.

Exterior Fire-Test Exposure: Class A; ASTM E 108, suitable for application.

F.

Pre-Installation Conference: Conduct conference at Project site. Review methods and procedures related to roofing system including, but not limited to, the following:

1.

Meet with Contracting Officer’s Representative (COR), 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.

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.

10.

Document proceedings, including corrective measures and actions required, and furnish 3ea. copies of record to COR.

1.7

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, 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.

1.8

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.

1.9

WARRANTY

A.

Manufacturer’s Warranty: Manufacturer's standard form, without monetary limitation, in which manufacturer agrees to repair or replace components of roofing system that fail in materials or workmanship within specified warranty period. Failure includes roof leaks.

1.

Special warranty includes roofing membrane, base flashings, roof insulation, fasteners, and other components of roofing system.

2.

Warranty Period: 10 years from date of Government Final Acceptance.

B.

Installer’s Warranty: Submit roofing Installer's warranty, on warranty form at end of this Section, signed by Installer, covering Work of this Section, including all components of roofing system such as roofing membrane, base flashings, roof insulation and fasteners, for the following warranty period:

1.

Warranty Period: Two (2) years from date of Government Final Acceptance.

PART 2 - PRODUCTS

2.1

MANUFACTURERS

A.

Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1.

Cold Process built-up roof restoration system:

a.

Tremco, Inc. or Government approved equal, based on product performance, warranty terms, and regulatory requirements.

B.

In other Part 2 articles where titles below introduce lists, the following requirements apply for product selection:

1.

Manufacturers: Subject to compliance with requirements, provide products by the manufacturers specified (or Government approved equal).

2.

Tremco, Inc. or Government approved equal, based on product performance, warranty terms, and regulatory requirements.

2.2

ROOFING MEMBRANE PLY/STRIPPING PLY

A.

Polyester Ply: ASTM D 3776; High Tensile trilaminate fabric with fiberglass scrim and polyester mats laminated with an acrylic binder.

B.

Stripping Ply: ASTM D 4601; Trilaminate base sheet – polyester/glass/polyester, reinforced coated sheet, 31 lb. base sheet.

1.

Use: Stripping Ply for flanged flashings.

2.

Reinforcing: Glass-fiber mat.

3.

Physical Properties: Provide ply sheet materials with the following properties:

a.

Thickness: 1.2 mm b.

Weight: 33 lb., fiberglass felt c.

Breaking Strength: 90 lbf/in MD. 70 lbf/in XMD 2.3

FLASHING MATERIALS

A.

Flashing Membrane: ASTM D 5147; modified bitumen sheet, 2.0 mm, bilaminate reinforced, tensile strength – 295 lbf/in MD and XMD.

B.

Cold-Applied Flashing Adhesive: Roofing system manufacturer’s standard one-part, asbestos-free, cold-applied adhesive specially formulated for compatibility and use with reinforced flashing membrane.

C.

Glass-Fiber Fabric: Woven glass cloth, treated with asphalt, complying with ASTM D 1668, Type I.

2.4

ASPHALT MATERIALS

A.

Asphalt Primer: Water-based, ASTM D 41.

B.

Cold-Applied Rubberized Emulsion: ASTM D 1475.

1.

Physical Properties: Provide cold process adhesive materials with the following properties:

a.

Asbestos Content: ASTM D 276 None b.

Density: ASTM D 1475 @ 77 deg F

8.4 lb/gal

2.5

AUXILIARY MATERIALS

A.

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

B.

Asphalt Roofing Cement: ASTM D 4586; asbestos-free, of consistency required by roofing system manufacturer for application.

C.

Mastic Sealant: Polyisobutylene, plain or modified bitumen, non-hardening, non-migrating, non-skinning, and non-drying.

D.

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

E.

Miscellaneous Accessories: As recommended by roofing system manufacturer.

F.

‘Cool Roof’ Coating: Fire retardant, styrenated acrylic latex roof coating, reflectance 90%.

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 set and braced and that roof drains are securely clamped in place.

2.

Proceed with installation only after unsatisfactory conditions have been corrected.

3.2

PREPARATION / MEMBRANE REPAIR

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 adjacent surfaces. Remove roof-drain plugs when no work is taking place or when rain is forecast.

C.

Vacuum/broom roof of all existing aggregate/granules from membrane and properly dispose of.

D.

Roof Membrane Repair: Address all splits, breaks, and damage to membrane. Spud clean all aggregate to expose smooth, clean felts. Prime area with water-based primer. Directly over affected area, install specified ply sheet set in fibrated mastic, extend repair six (6) inches past defect in all directions.

3.3

ROOFING MEMBRANE INSTALLATION, GENERAL

A.

Install membrane system according to roofing system manufacturer’s written instructions and applicable recommendations of ARMA/NRCA’s “Quality Control Guidelines for the Application of Built-Up Roofing.”

B.

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

C.

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

D.

Coordinate installing system components so membrane sheets are not exposed to precipitation or left exposed at the end of the workday or when rain is forecast.

1.

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

2.

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

E.

Emulsion Warming:

1.

An in-line heat exchange unit may be used to facilitate application.

a.

Maximum Adhesive Temperature: 100 deg F. Do not exceed the flash point of the adhesive.

2.

Heat Exchange Unit: Filled with heat transfer oil approved by equipment manufacturer.

3.

Follow operational procedures as recommended by equipment manufacturer.

3.4

ROOFING MAT / REINFORCED SYSTEM INSTALLATION

A.

Install reinforcing mat according to roofing system manufacturer's written instructions, starting at low point of roofing system. Align mat without stretching. Shingle side laps of four (4) inches both sides and ends. Shingle in direction to shed water. Extend mat over and terminate beyond cants.

1.

Adhere ply in rubberized emulsion, applied at rate required by roofing system manufacturer, to form a uniform membrane without ply felts touching each other.

2.

Spray-apply base coat of emulsion at rate of four (4) gallons per 100 square feet. While emulsion is still wet, broom mat into wet emulsion without any wrinkles or voids. Apply top coat of emulsion at same rate as base, four (4) gallons per 100 square feet.

B.

Surfacing Application:

1.

Prior to application of ‘cool roof’ coating, Contractor shall inspect roof with manufacturer’s technical representative and repair all deficiencies noted.

2.

Over entire roof surface, apply uniform and continuous application of white ‘cool roof’ coating at a rate according to roof system manufacturer’s written instructions. Coating to be applied at rate of one (1) gallon per 100 square feet, two (2) coats required at this rate.

3.5 FLASHING AND STRIPPING INSTALLATION (installation of new base flashings and repair of existing damaged base flashings) A.

Install base flashings over cant strips and other sloping and vertical surfaces, at roof edges, and at penetrations through roof, and secure to substrates according to roofing system manufacturer’s written instructions and as follows:

B.

Prime substrates with water-based primer.

1.

Base Flashing Application: Adhere base flashings to substrate in mastic.

C.

Extend base flashings up the wall a minimum of 8 inches above roof membrane and 6 inches onto field of roof membrane.

D.

Mechanically fasten top of base flashings securely at terminations and perimeter of roofing.

1.

Seal top termination of base flashings. Application: Adhere base flashings to substrate in mastic.

3.6

MISCELLANEOUS WORK

A.

Drains: Check all existing drains to ensure they are free and clear. Immediately report all plugged drains to the COR. Tighten all drain bolts. Spud gravel off perimeter edge of lead sheets in field in a six (6) inch wide band. Clean, prime, and set six (6) inch wide strip of composite ply in fibrated mastic and roll in for full adhesion. Re-install strainers.

B.

Penetrations/Projections: Check all existing lead flashings on vents. Remove and replace with new, any cracked or damaged lead flashings. If cracked on top, furnish and install new lead cap.

C.

Base Flashings: Check all existing base flashings for damage. All damage to base flashings shall be repaired through the installation of new, like material adhered directly over affected areas and extending past affected area a minimum of six (6) inches in each direction. New base flashings shall extend from top of flashing, down onto the roof system, six (6) inches. Terminate flashing as specified. All open laps shall be sealed by five (5) coursing with white elastomeric mastic and mesh. Square off in a four (4) inch wide band. Coat all exposed base flashings with ‘cool roof’ coating at rate of two (2) gallons per 100 square feet.

D.

Caulking: Add caulking to all existing terminations and metal flashings. Clean and add lift of caulking to all areas as required to provide a new weathertight seal.

E.

Flanged Flashings: Secure metal as required. Spud aggregate/clean area in a six (6) inch wide band. Clean, prime, and set composite ply in fibrated mastic centered over exterior edge of flange.

F.

Walkpads: Remove and set aside for re-use. Re-install to original locations upon completion of roof work. If unable to remove walkpad, directly abut system to walkpad edge.

G.

Gravelstop Joints: Spud clean to membrane, six (6) inch wide band at all gravelstop joints. Clean, prime, and set composite ply in fibrated mastic and roll in.

H.

Field Wrap: On projections and penetrations: Furnish and install smooth modified bitumen sheet around penetration/projection and extend up flashing a minimum of eight (8) inches, clamp and caulk. Extend sheet onto existing membrane a minimum of six (6) inches.

3.7

FIELD QUALITY CONTROL

A.

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

1.

Notify COR in writing a minimum of 5 work days in advance of date and time of inspection.

B.

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

3.8

PROTECTING AND CLEANING

A.

Protect roofing system from damage and wear during construction period. When remaining roofing work will not affect or endanger completed roofing work, inspect completed roofing work for deterioration and damage, describing its nature and extent in a written report, with 3ea. copies to COR.

B.

Correct deficiencies in or remove roofing system that does not comply with requirements, repair substrates, and repair or re-install roofing system to a condition free of damage and deterioration at time of Government Final Acceptance and according to warranty requirements.

C.

Clean overspray and spillage from adjacent surfaces using cleaning agents and procedures compatible with the affected surfaces.

3.9

ROOFING INSTALLER'S WARRANTY

A.

WHEREAS <Insert name> of <Insert address>, herein called the "Roofing Installer," has performed roofing and associated work ("work") on the following project:

1.

Owner: <Insert name of Owner.>

2.

Address: <Insert address.>

3.

Building Name/Type: <Insert information.>

4.

Address: <Insert address.>

5.

Area of Work: <Insert information.>

6.

Final Acceptance Date: <Insert date.>

7.

Warranty Period: <Insert time.>

8.

Expiration Date: <Insert date.>

B.

AND WHEREAS Roofing Installer has contracted (either directly with Government 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;

c.

fire;

d.

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

e.

faulty construction of parapet walls, copings, 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 Government.

2.

When work has been damaged by any of the foregoing causes, Warranty shall be null and void until such damage has been repaired by Government.

3.

Roofing Installer is responsible for damage to work covered by this Warranty, and is liable for consequential damages to building and to building contents resulting from leaks or faults or defects of work, except as excluded herein.

4.

During Warranty Period, if Government allows alteration of work by anyone other than Roofing Installer (or authorized agent thereof), 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 Government engages Roofing Installer (or authorized agent thereof) to perform said alterations, Warranty shall not become null and void unless Roofing Installer (or authorized agent thereof), before starting said work, shall have notified Government 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.

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.

Government 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 Government from other remedies and resources lawfully available to Government 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 Government or a subcontract with Government's General Contractor.

E.

IN WITNESS THEREOF, this instrument has been duly executed this <Insert day> day of <Insert month>, <Insert year>.

1.

Authorized Signature: <Insert signature.>

2.

Name: <Insert name.>

3.

Title: <Insert title.>

END OF SECTION 07543

ROOF RESTORATION WITH TITLE 24, ‘ENERGY STAR’ COATING SYSTEM 07543 - 1

(Section applies to Main Building (North Wing), WAB (Directors Wing), and Service Building roofs)