SMEA-2P-14-3G-6xE — Acrylic-surfaced reinforced roof system

SMEA-2P-14-3G-6xE is a Western Colloid fluid applied reinforced roof system, revised 10/20. The classification is recover, smooth surface / cap sheet / single ply, with a 1 ply polyester and glass fiber roving reinforced membrane and a 1 ply polyester / acrylic reinforced surface.

The assembly upgrades existing BUR, Mod Bit, EPDM, TPO and Hypalon by a cold process. This liquid-applied roofing system is water based with very low odor and combines polyester fabric with fiber glass strands.

The manufacturer's specifications index files this system as a cap, single-ply, smooth roof system in the Glas-Shield line, with #298 Emulsion and ElastaHyde Acrylic White as its products. It also carries the statement U.L. Classified and FM 4470 Class 1 Approved.

The reinforced membrane is built in an emulsion half and an acrylic half. Amounts are per 100 square feet.

• #298 Emulsion base coat: 5 gallons, 19 pounds dry.
• Polyester fabric: 1 ply, 2.5 pounds.
• #298 Emulsion top coat: 9 gallons, 35 pounds dry.
• Chopped glass fiber roving in the top coat emulsion: 3 pounds.
• ElastaHyde base coat: 3 gallons, 21 pounds dry.
• Polyester fabric in the ElastaHyde: 1 ply, 2.5 pounds.
• ElastaHyde White Acrylic surface and reflective coating: 3 gallons, 21 pounds dry.

The dry system weighs 104.0 pounds per 100 square feet and measures approximately 185 mils thick.

This assembly meets U.L. Class A, California Title 24, LEED (USGBC) and Energy Star criteria.

The fabric is W26/T326 at 2.75 ounce firm or T272 at 3.0 ounce soft. WCP-SF (W-26) has a firm but pliable finish and is 0.025 inch thick, with average tensile of 41 pounds, 25 percent elongation, 127 pounds burst strength and 14 pounds trapezoid tear. It comes in 10 square rolls of 40 inch by 324 feet.

WCP-HS (T272) is heavier. It averages 57 pounds tensile and 61 percent elongation, and bursts at 176 pounds. Its close knit may need light brooming to remove air pockets.

ElastaHyde #720 ARC is available in white, gray and tan. The ratings below come from the CRRC labels for three of the colors.

• California Tan, CRRC ID 0682-005: solar reflectance 0.80 initial and 0.75 weathered, thermal emittance 0.90 initial and 0.86 weathered, SRI 100 initial and 92 after 3 years.
• Platinum Gray, CRRC ID 0682-004: solar reflectance 0.76 initial and 0.72 weathered, thermal emittance 0.90 initial and 0.86 weathered, SRI 94 initial and 88 after 3 years.
• White, CRRC ID 0682-003: solar reflectance 0.84 initial and 0.75 weathered, SRI 106 initial and 93 aged.

The coating is a 100 percent acrylic that meets ASTM D6083. Initial elongation is above 250 percent and above 175 percent after weathering, with tensile strength above 250 psi. It passes 1000 hours of xenon arc UV exposure (ASTM D4798) and shows no fungal growth (ASTM G21).

#298 is non-flammable when wet, and the dry film is self extinguishing. It resists checking and cracking and contains no aromatic hydrocarbons. It is used on smooth or mineral surfaced built-up roofing, on metal roofing, masonry, stucco, parapet walls and curbs, and as a below grade damp proofing compound. It is also a base coat for SilverWhite or ElastaHyde.

Spray application is 3 to 6 gallons per 100 square feet. Brush, roller, soft broom or squeegee application is 3 gallons per 100 square feet per coat. Its listed uses include UL Class A and Factory Mutual Class 1 roofing systems.

#800 Elastic Cement repairs masonry cracks, seals seams, flashings and screws on metal roofs, and repairs expansion joints in concrete walls, among other uses. #850 SWS walkway coating is a water based acrylic coating with aggregate that forms a textured non-slip walking surface on smooth and coated roofs. #8000 All Weather Elastic Cement is a solvent-based white sealant for wet conditions.