SMAA-2P-8xE — All-acrylic reinforced roof system

SMAA-2P-8xE is an all-acrylic Western Colloid roof system for smooth-surfaced roofs. The system sheet carries the title Upgrade Smooth Surface / Cap Sheet / Single Ply and the line 2 Ply Polyester Reinforced - Acrylic Surface, All Acrylic. The cold process, water based assembly upgrades existing BUR, Mod Bit and PVC single ply roofing. It has very low odor, a polyester reinforced acrylic body and a reflective elastomeric top surface. Use over EPDM, spray polyurethane foam or TPO membranes follows separate specific specifications. Fire, energy and green-building criteria for this system are Factory Mutual Standard 4470 Class 1 and U.L. Class A, plus Energy Star, LEED (USGBC) and California Title 24.

The system has six layers. Weights are approximate dry weights per 100 sq. ft.

• Base coat of ElastaHyde: 3 gallons, 21 lb
• Polyester fabric, first ply: 2.5 lb
• Interply coat of ElastaHyde: 2 gallons, 14 lb
• Polyester fabric, second ply: 2.5 lb
• Top coat of ElastaHyde: 1.5 gallons, 10.5 lb
• Reflective surface coating of ElastaHyde White Acrylic: 1.5 gallons, 10.5 lb

Total system dry weight is 61.0 lb. Approximate total dry thickness is 92 mils.

The first ply is ElastaHyde at 3 gallons per 100 sq. ft. with a half-width polyester strip at the low edge followed by full-width sheets. The second ply is set into 2 gallons per 100 sq. ft. with a full-width ply. Brooming gives full saturation, and the polyester stops 2 inches above the cant. The top coat and the reflective coat are each 1 1/2 gallons per 100 sq. ft., laid cross-hatch with 24 hours of drying after the first. The material is mixed well, strained if sprayed, and not thinned.

Roof membranes are made sound and watertight. Debris is vacuumed, swept or blown off, and the full roof is washed with attention to valleys and ponding areas. Over smooth BUR, asphalt emulsion or non-granulated modified bitumen, a clear acrylic primer, #970 A2A, goes on at 1/2 gallon per 100 sq. ft. Granulated surfaces and PVC need no primer.

Replaced gravel stops are swapped for low or no rise metal edge, nailed at 4 inches on center. The metal is stripped in with polyester fabric and #800 Elastic Cement so every nail is covered. Where edge flashing stays in place, the roofing is cut back 2 inches from the rise before the strip-in. A new or replaced pipe flange is set in a bed of #8000 All Weather Elastic Cement and nailed. Polyester fabric and #800 strip over the nails, and the membrane stops at the base of the cone. Cones and pipes are sealed again with #800 and fabric after the membrane is in. Where sign anchors or equipment supports pierce the membrane, #800 forms a cone-shaped seal, and large voids are bridged with a ply of polyester.

ElastaHyde 720 ARC has low temperature flexibility of Pass at 15 degrees F, 1/2 inch (ASTM D522). Its wet adhesion is above 10 pli and dry adhesion above 17 pli over emulsion (ASTM D903), and tear resistance is above 100 lbf/in (ASTM D624). It is 53 percent solids by volume and 66 percent by weight, weighs about 11.5 to 12 lb per gallon, and has a viscosity of 100 to 110 KU. #800 Elastic Cement is 65 to 70 percent solids by weight, remains flexible below freezing and has elongation greater than 500 percent. Its heavy body is brushed or troweled, with brush application recommended, and it is cleaned from tools with water. Together with ElastaHyde, it forms a liquid-applied roofing membrane system with polyester reinforcement.

Application is not permitted during inclement weather. It is also held back when temperatures below 40 degrees F, rain or other inclement weather are expected within 48 hours, or when frost or ice covers the deck. Material storage on the roof is in approved areas that spread the load inside the live load limits of the roof construction, and every container lid stays tight.

• Polyester fabric: Western Colloid 2.75 ounce firm or 3.0 ounce soft stitchbonded polyester, supplied in various widths, used to reinforce asphalt emulsion, acrylic coating and flashing materials
• #8000 All Weather Elastic Cement: a solvent-based white sealant that sets the flange of a new or replaced pipe jack, and a stated alternative to #800 where more immediate water resistance is needed
• #850 SWS walkway coating: a water based coating of acrylic resins and binders with an aggregate that forms a textured, non-slip surface with high abrasion resistance

• Solar reflectivity, initial: 84 percent (ASTM C1549)
• Thermal emittance, initial: 89 percent (ASTM C1371)
• SRI: 106 initial and 93 aged (ASTM E1980-01)
• Flammability: non-flammable wet, Class A dry (U.L. 790 and ASTM E108)
• 1000 hour xenon arc UV exposure: Pass (ASTM D4798)

• Application temperature: minimum 50 degrees F, maximum 100 degrees F ambient
• Drying time: 1 hour at 100 sq. ft. per gallon, 70 degrees F and 50 percent relative humidity
• Dry film thickness: minimum 20 mils, 24 or more recommended
• VOC: actual 10, regulatory 20
• Coverage: 75 to 100 sq. ft. per gallon per coat, 2 1/2 to 6 gallons per 100 sq. ft. in total depending on specification and surface
• Equipment cleanup: soap and warm water
• Applied by roller, brush or spray, with high pressure airless spray giving the strongest results

Standard white, California Tan, Platinum Gray and custom colors are available. The listing is with the Cool Roof Rating Council, and Title 24 and ENERGY STAR naming applies to white, California Tan and Platinum Gray. Pails of 5 gallons, drums of 55 gallons, totes and bulk tankers carry the product.

Topcoat use covers Western Colloid FARR and metal roof systems, existing SPF roofs and built-up roofs, whether conventional or modified. The Quick Set (QS) version suits damp, wet or rainy weather ahead of full drying. Wood shingles, untreated wood and ponding beyond 72 hours without reinforcement are outside the recommended uses.

• White (#800W) or black (#800B); the black dries faster in cold weather
• Packaging: 5-gallon pails
• Cure through dehydration: 1 to 2 days; tack free in 1 hour; can be coated in 1 to 2 hours
• Maximum single application: less than 3/16 inch thick, with multiple coats where more is required