SMAA-1P-6xE — All-acrylic reinforced roof system

SMAA-1P-6xE is an all-acrylic Western Colloid roof system with four layers and one polyester ply. Specification SMAA-1P-6xE is headed Upgrade Smooth Surface / Cap Sheet / Single Ply, 1 Ply Polyester Reinforced - Acrylic Surface. The cold process, water based system upgrades existing BUR, Mod Bit and PVC single ply roofing and has very low odor. EPDM, spray polyurethane foam and TPO membranes are covered by separate specific specifications. The system carries U.L. Class A and Factory Mutual Standard 4470 Class 1 ratings and is named against California Title 24, LEED (USGBC) and Energy Star.

The four layers carry these approximate dry weights per 100 sq. ft.

• Base coat of ElastaHyde: 3 gallons, 21 lb
• Polyester fabric: 1 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 44.5 lb and approximate total dry thickness is 65 mils.

One coat of ElastaHyde at 3 gallons per 100 sq. ft. receives a full-width ply of polyester starting at the low edge of the roof. The ply is lightly broomed until saturated with no wrinkles or voids, and it ends 2 inches above the cant. Foot traffic on the wet fabric displaces the coating. After the membrane, pipe flashings, cones, exposed metal joints and flanges get a three course #800 Elastic Cement and fabric treatment. The top coat and reflective coat follow at 1 1/2 gallons per 100 sq. ft. each, cross-hatched, with 24 hours between them. The coating is not thinned.

The roof is made sound and watertight, cleared of loose gravel, dirt and debris, and washed in full. #970 A2A primer at 1/2 gallon per 100 sq. ft. goes over smooth BUR, asphalt emulsion or non-granulated modified bitumen. Where a protected, non-slip surface is wanted, #850 SWS walkway coating is rolled on at 2 gallons per 100 sq. ft. with a short nap or smooth roller. A second coat of 2 gallons per 100 sq. ft. follows after at least 24 hours, and it can be laid at right angles to the first. Roof doors, hatches and equipment service doors can take an added layer of #850 SWS with a polyester ply, laid before the two finish coats. The coating contains an aggregate that forms a textured surface with high abrasion resistance.

ElastaHyde 720 ARC is available in white, gray and tan, with custom colors possible. Reflectivity values are based on the white. The coating is listed by the Cool Roof Rating Council, and CRRC labels are published for three colors.

• White, product ID 0682-003: solar reflectance 0.84 initial and 0.75 weathered, thermal emittance 0.89 and 0.91, SRI 106 and 93 aged
• California Tan, product ID 0682-005: solar reflectance 0.80 and 0.75, thermal emittance 0.90 and 0.86, SRI 100 and 92 aged
• Platinum Gray, product ID 0682-004: solar reflectance 0.76 and 0.72, thermal emittance 0.90 and 0.86, SRI 94 and 88 aged

The coating can be used to meet 2016 California Title 24 cool roof requirements. White, Platinum Gray and California Tan are the colors that meet ENERGY STAR guidelines.

#800 Elastic Cement is used as a surface flashing compound, a repair compound for cold process or built-up roofs, and a sealer for cracks in masonry, stucco or parapet walls. It also seals seams, flashings and screws on metal roofs and repairs mobile home, trailer and recreational vehicle roofs. Other uses are expansion joints in concrete walls, air conditioning ducts, sheet metal gutters, and metal coping and wall caps. Used with ElastaHyde it forms a liquid-applied reinforced roofing repair detail at penetrations and seams.

No coating goes on in rain, snow or freeze, or onto ice or frost. The 48 hours after application must also be free of expected rain, inclement weather and temperatures below 40 degrees F. Repair work with no water based materials is allowed immediately before inclement weather.

• 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
• #970 A2A Bonding Primer: a clear acrylic primer that improves adhesion of acrylic coatings to smooth BUR, emulsion and non-granulated modified bitumen

• Elongation: above 250 percent initially and above 175 percent after weathering (ASTM D2370)
• Tensile strength: above 250 psi (ASTM D2370)
• Wet adhesion over emulsion: above 10 pli, dry adhesion above 17 pli (ASTM D903)
• Tear resistance: above 100 lbf/in (ASTM D624)
• Low temperature flexibility: Pass at 15 degrees F, 1/2 inch (ASTM D522)
• Solids: 53 percent by volume (ASTM D2697) and 66 percent by weight (ASTM D1644)
• Weight per gallon: approximately 11.5 to 12 lb
• Viscosity: 100 to 110 KU (ASTM D562)
• 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

Coating can be bought in a Quick Set (QS) version for work where wet weather is likely before drying. Delivery containers are 5-gallon pails, 55-gallon drums, totes or bulk tankers. The topcoat role covers Western Colloid FARR membranes, with built-up roofs of conventional or modified type and existing SPF roofs also named. Wood shingles and untreated wood are surfaces over which it is not recommended.

• White (#800W) or black (#800B); the black dries faster in cold weather
• Packaging: 5-gallon pails
• Total solids: 65 to 70 percent by weight
• Elongation: greater than 500 percent; remains flexible below freezing
• Application temperature: minimum 50 degrees F
• 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