SM-12-3G-3E — Acrylic-surfaced reinforced roof system

SM-12-3G-3E is a Western Colloid fluid applied reinforced roof system, revised 10/20. The classification is recover, smooth surface / cap sheet, glass fiber roving reinforced, with an acrylic surface.

It upgrades existing BUR and Mod Bit by a cold process. This liquid-applied roofing assembly is water based and has very low odor. Light weight fiber glass strands reinforce it.

The manufacturer's specifications index files this system as a cap, single-ply, smooth roof system under the Glas-Shield fluid applied reinforced roof system line, with #298 Emulsion and ElastaHyde White Acrylic as its products.

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

• #298 Emulsion reinforced coat of 12 gallons, 46 pounds dry.
• Chopped glass fiber roving in the emulsion: 3 pounds.
• Surface layer: ElastaHyde white acrylic reflective coating, 3 gallons, 21 pounds dry.

Dry weight totals 59.0 pounds, with an approximate dry thickness of 125 mils.

Energy Star, LEED (USGBC), California Title 24 and U.L. Class A are all named as met by this assembly. Solar reflectivity of the white coating is 84 percent initial under ASTM C1549, and thermal emittance is 89 percent under ASTM C1371.

ElastaHyde #720 ARC reflects over 84 percent of the sun's rays in white and acts as a thermal reflector through its hiding and reflective pigments. It is a surface coating for Western Colloid fluid applied reinforced roofing membranes and metal roof systems, and is also recommended on conventional and modified built-up roofs and existing spray polyurethane foam roofs.

• Base: 100 percent acrylic.
• Colors: white, gray, tan and custom colors.
• Weight: about 11.5 to 12 pounds per gallon.
• Consistency: heavy paint for heavy duty spray, brush or roller.
• Drying time: 1 hour at 70 degrees F and 50 percent relative humidity at 100 square feet per gallon.
• Dry thickness: 20 mils minimum and 24 mils or more recommended.
• Coverage: 75 to 100 square feet per gallon per coat.
• Adhesion to emulsion: above 10 pli wet and above 17 pli dry (ASTM D903).

An ElastaHyde Quick Set formulation has its own bulletin. Surfaces over fresh asphalt emulsion such as #298 are coated once the emulsion is dry. Emulsion cures in 2 to 3 days in warm, dry weather. Surfaces are washed to remove residue and primed with #970 A2A Primer.

The fiber glass roving is a continuous strand type designed for chopped glass spray guns. The materials list also names W26/T326 and T272 stitchbonded polyester fabric. #298 supplies the 12 gallon reinforced coat as an asphaltic bentonite clay emulsion with 45 to 50 percent total solids and a wet film that is non-combustible.

The dry film of #298 is self extinguishing. Permeability is 0.0 to 2.0 depending on thickness.

T272 (WCP-HS) is 3 ounce with 176 pounds burst strength, and W-26 (WCP-SF) is 2.75 ounce with 127 pounds burst strength. #800 Elastic Cement is a heavy bodied compound with greater than 500 percent elongation. It is applied at a minimum of 50 degrees F, and a single coat is kept under 3/16 inch thick. It is not DOT regulated.