Each job must be approved by American WeatherStar before the project begins to be eligible for a warranty.

PART 1 — GENERAL

1.01  DESCRIPTION

A.   The intention of this specification is to outline the procedures for the application of WeatherStar Coatings reflective roof coatings for the purpose of Recoating Spray Polyurethane Foam Roof surfaces. These suggested specifications describe materials, methods and conditions necessary for the proper application of WeatherStar Coatings. Actual application requirements may vary and are the responsibility of the contractor.

B.   This specification may not outline all procedures for preparation and finishing of penetrations, drains, flashings, etc. This work should be outlined separately by the contractor before the work commences and shall be performed observing good trade practices.

1.02  APPROVED APPLICATOR

A.   All WeatherStar Coatings products shall be applied by a single, experienced and competent Approved Applicator or applicator approved by WeatherStar Coatings.

B.   Contractor shall be an Approved Applicator of WeatherStar Coatings and doing business under the same company name. Financial stability shall include no filing of bankruptcy during the past seven years.

PART 2 — PRODUCTS

2.01  COATINGS AND RELATED MATERIALS

All Materials used shall be manufactured by and or approved by WeatherStar Coatings and shall meet the following specifications.

2.02  ELASTOMERIC COATING SYSTEM

URETHANE 520
Type: Single Component Moisture Cure Urethane
Elongation: 350%
Viscosity:  2,000 cps
Density: 9.2 lbs./gal.
Tensile Strength: 975 psi
Volume Solids: 70% ± 1%
Color: Silver

FABRIC BOND 930
Type: Primer / Surface conditioner
Viscosity: 600-800 cps
Density: 8.3 ± .1 lbs./gal.
Volume Solids:  38 % ± 1% by weight
Color: Blue

POLYESTER FABRIC
Type: Spunbound polyester
Tensile: 57 lbs.
Elongation: 61%

2.03  DELIVERY AND STORAGE

A.   Materials shall be delivered in their original, tightly sealed containers or unopened packages, all clearly labeled with the manufacturer's name, file number, and lot numbers.

B.   Materials shall be stored out of the weather in their original tightly sealed containers or unopened containers as recommended by the manufacturer.

2.04  WARRANTY

A.   American WeatherStar warrants that the material supplied will meet or exceed physical properties as published. The contractor guarantees that workmanship will be free of defects in coating application. Since performance of existing roof substrate or previously applied coatings are beyond the control of American WeatherStar or the contractor, requests for additional warranty coverage shall be subject to prior approval by American WeatherStar.

B.   Comply with manufacturer's warranty application procedures. A Pre-Project Inspection Report should be submitted and approved prior to job commencement.

C.   Protection of building and occupants: All surfaces not to receive system specified shall be protected from overspray hazard, i.e. windows, doors, exterior and vehicles. Protective coverings shall be secured against wind and shall be vented if used in conjunction with applications preventing collection and moisture.

PART 3 — INSTALLATION

3.01  SURFACE PREPARATION

A.   Preparation shall include all requirements specified by WeatherStar Coatings to ensure proper adhesion of the WeatherStar Coatings products to the existing substrate.

B.   Preparation shall include, but not be limited to the following:

1.   All unnecessary and non-functional equipment and debris shall be removed from the roof.

2.   Substrate must be pressure-washed. A minimum working pressure of 1,500‑2,000 psi shall be used to remove all dirt, dust, previous paints and coatings which are delaminating as well as waste products (oil, oil-based roof cements, solvents, grease, animal fats, etc). Use TSP (Tri Sodium Phosphate). Contact WeatherStar Coatings for additional information. Do not use too mush pressure when washing as this may damage existing foam substrate.

3.   HVAC condensate drains shall be properly routed to roof drains or plumbed off the roof.

4.   Wet roof insulation and damaged membranes are to be removed and replaced as necessary to match existing specified material.

5.   All roof penetrations, curbs, vent stacks and related roof penetrations are to be flashed in accordance with roof manufacturer's specifications. All laps and wall flashings are to be repaired in accordance with roof manufacturer's specifications.

6.   Contractor shall make every effort to mechanically eliminate all ponding water areas on the roof surface prior to application of any roof coating product.

3.02  PRIMER APPLICATION

A.   Examine substrate to receive roof coating. Do not proceed with installation of the WeatherStar Coatings roof coating until all problem areas have been corrected in a manner acceptable to the manufacturer.

B.   An adhesion test should be conducted with one of these primers to ensure proper adhesion to the existing coating. (Note - Adhesion to the existing roof substrate depends on the condition of any existing coating.) 

C.   If priming is necessary, apply one coat of Fabric Bond 930 or another suitable American WeatherStar primer at a rate of one gallon per one hundred square feet. Contact American WeatherStar for more details.

3.03  COATING APPLICATION

A.   Examine substrate to receive roof coating. Do not proceed with installation of WeatherStar Coatings until unsatisfactory conditions have been corrected.

B.   Repair: In areas where the substrate has been damaged such as polyurethane foam with an abraded or ground surface or where loose coating has been removed, apply a base coat by brush or spray to the surface that has been primed with the appropriate American WeatherStar primer coat.

C.   Repair all blisters cracks and splits in foam using polyurethane froth packs.  Small areas can be repaired using Urethane 520 and 4" or 6" Fabric.  Please contact WeatherStar Coatings for more information.

3.04  APPLICATION RATES (26-28 MIL SYSTEM)

A.   BASE COAT: Apply base coat of Urethane 520 roof coating at a rate of 1.25 gallons per 100 square feet. Dry film thickness shall be approximately 13‑14 mils.

B.   TOP COAT: Apply a top coat of Urethane 520 roof coating at a rate of 1.25 gallons per 100 square feet. Dry film thickness shall be approximately 13‑14 mils.

C.   Each coat must be allowed to dry for 24-48 hours depending on humidity and temperature. The roof is to be inspected for defects, flaws or holidays and repaired if necessary.

NOTE:  Urethane 520 can be substituted with several of the other American WeatherStar products, call for details and coverage rates.

D.   Base coat and final coat are to be applied at a rate of 2.5 gallons per 100 square feet - 1 base coat, 1 final coat (26-28 dry mil average).

E.   Granules: An optional granular coat may be added to allow for foot traffic. Apply one coat of Urethane 520 at the rate of not less than .75 gallon per 100 sq. ft (5 mils dried material). Immediately broadcast roofing granules into finish coat at the rate of 30 lbs. per 100 sq. ft.

3.05  PONDING

A.   Known ponding water areas are to be repaired using commonly acceptable roofing practices so as to allow proper drainage of roof area.

B.   Ponding water areas are a sign of possible mechanical failure in the roof. Water is to be intentionally diverted from ponding areas using accepted roofing practices. Ponded areas which evaporate within 7 days (under 1/2" deep) can be top coated with an additional coat of Urethane 520 to increase water resistance.

C.   Application of Urethane 520 is to be made at 50 square feet per gallon.

D.   Urethane 520 is to be extended 2 feet beyond the ponded area.

3.06  RESTRICTIONS / LIMITATIONS

This system is to be used only in conjunction with commonly accepted roofing standards but not limited to the following:

A.   No application of materials shall commence during inclement weather or when precipitation is imminent.

B.   No thinning of materials is permitted.

C.   No materials are to be applied to wet, dirty, or frozen surfaces.

D.   In conjunction with the final inspection, all debris, containers, materials and equipment are to be properly removed from the job site. Grounds are to be cleaned, undamaged, and acceptable to the owner.

E.   Reflectivity of coatings may be reduced if roof surface is not cleaned on a regularly scheduled basis.

CAUTION:  Do not apply within two hours of sunset, rain, fog or freezing temperatures. WeatherStar Coatings must be completely dry before exposing to water or foot traffic. Keep WeatherStar Coatings containers covered when not in use. Dispose of all containers in accordance with state and local environmental regulations. Keep away from children. If ingested, DO NOT induce vomiting. Call Physician immediately.