SM-1P-14-3G-A — Aluminum-surfaced roof restoration system

SM-1P-14-3G-A is a Western Colloid fluid applied reinforced roof system, revised 10/20. The classification is recover, smooth surface / cap sheet, 1 ply polyester and glass fiber roving reinforced, with an aluminum surface.

It is a cold process method to upgrade existing BUR, Mod Bit, EPDM, TPO and Hypalon. This liquid-applied roofing system is water based with very low odor. Its reinforcement is polyester fabric together with fiber glass strands, and the surface is a highly reflective elastomeric aluminum coating.

The manufacturer's specifications index files this system as a cap, single-ply, smooth roof system under the Glas-Shield line, with #298 Emulsion and #525 SilverWhite Aluminum as its products. The index labels the surface as a reflective surface.

Five items make up the system, per 100 square feet.

• First coat: #298 Emulsion at 5 gallons, 19 pounds dry.
• Polyester fabric: 1 ply, 2.5 pounds.
• Final emulsion coat: #298 at 9 gallons, 35 pounds dry.
• Glass fiber roving, chopped into the top coat emulsion: 3 pounds.
• Surface coat: SilverWhite Aluminum reflective coating at 1.5 gallons, 4.5 pounds dry.

Dry weight totals 64.0 pounds and the approximate dry thickness is 124 mils. The assembly meets U.L. Class A.

#525 SilverWhite reflects up to 76 percent of sun rays and is made of asphalt emulsion with polished aluminum flake. Initial reflectivity is 76 percent by ASTM E97. It dries to a slightly textured metallic film.

The precautions set a minimum surface and air temperature of 55 degrees F and no rain, fog or cold weather for 72 hours. The emulsion beneath must be dry and cured. Applied over uncured emulsion, the aluminum coat may turn gray, dark gray or brown. Late afternoon or evening application can cause premature graying, browning or eggshell crazing.

Recoating is done after cleaning the existing SilverWhite, or after a 2 to 3 gallon per 100 square foot coat of #298 or #298E. The coating is not recommended over asphalt or wood shingles.

Fabric is W26/T326 at 2.75 ounce firm or T272 at 3.0 ounce soft. The glass roving is a continuous strand type designed for chopped glass spray guns.

WCP-HS (T272) is a 3 ounce stitchbonded polyester with 0.025 inch thickness and 176 pounds burst strength. WCP-SF (W-26) is 2.75 ounce, with 127 pounds burst strength and 25 percent elongation. Both are used with water base cold process and maintenance roof systems.

#298 serves here as base coat and top coat. It is an asphaltic bentonite clay emulsion with 45 to 50 percent total solids. It is used as a uniform weathering surface for built-up roofing, a protective surface for metal roofing, masonry and parapet walls, and a corrosion resistant surface for most exterior metal. Product weight is 8.2 to 8.7 pounds per gallon.

Container sizes are 5 gallon and 55 gallon drums, totes and bulk. Water cleans wet material and tools, while WCP-2000 Safety Solvent, paint thinner or kerosene cleans dry material.

#800 Elastic Cement is available in white or black, and black speeds drying in cold weather. It can be coated in 1 to 2 hours. It is non-flammable, low odor and free of asbestos fibers. It adheres to asphalt emulsion, wood, metal and masonry without special primers, and #900R Rust Primer is the Western Colloid primer named where rust is present. Its application temperature is a minimum of 50 degrees F.