SMAA-2P-10xE — All-acrylic reinforced roof system

SMAA-2P-10xE is an all-acrylic Western Colloid roof system titled Upgrade Smooth Surface / Cap Sheet / Single Ply, 2 Ply Polyester Reinforced with an acrylic surface. Every liquid layer in its component table is ElastaHyde. It is a cold process, water based method for upgrading existing roofing that includes BUR, Mod Bit and PVC single ply. The system has very low odor. Its acrylic liquid is reinforced with polyester fabric and surfaced with a reflective elastomeric coating. Four standards or programs are named alongside Factory Mutual Standard 4470 Class 1: U.L. Class A, California Title 24, LEED (USGBC) and Energy Star.

The system is classified as a cap, new or existing single-ply, smooth surface assembly. The listed product for it is ElastaHyde Acrylic White. The specification carries the number 17 and was revised 03/22.

Seven layers form the system. Approximate dry weights are per 100 sq. ft.

• Base coat of ElastaHyde: 3 gallons, 21 lb
• Polyester fabric, first ply: 2.5 lb
• Interply coat of ElastaHyde: 2.5 gallons, 17.5 lb
• Polyester fabric, second ply: 2.5 lb
• First top coat of ElastaHyde: 1.5 gallons, 10.5 lb
• Second top coat of ElastaHyde: 1.5 gallons, 10.5 lb
• Reflective surface coating of ElastaHyde: 1.5 gallons, 10.5 lb

The total system dry weight is 75.0 lb and the approximate total dry thickness is 108 mils.

The existing roof is repaired until it is sound and watertight, with loose gravel, dirt, dust and debris removed by vacuum, sweeping or power blower. The whole roof surface is washed, with special attention to valleys and ponding areas. On smooth BUR, asphalt emulsion or non-granulated modified bitumen, #970 A2A primer goes down at 1/2 gallon per 100 sq. ft. and dries completely first. Granulated surfaces and PVC membranes do not need it. Small splits and irregularities are repaired by the three course method. #800 Elastic Cement goes on at 5 gallons per 100 sq. ft., about 1/8 inch thick, one ply of polyester is brushed into the wet cement until saturated, and a second #800 coat follows at 4 gallons per 100 sq. ft.

The first ply starts with ElastaHyde at 3 gallons per 100 sq. ft. A half-width strip of polyester is embedded at the low edge of the roof and full-width sheets continue up the slope. After curing, the second ply is set into ElastaHyde at 2 gallons per 100 sq. ft. with full-width polyester. Both plies are lightly broomed to full saturation and stop 2 inches above the cant. Walking on the fabric while the coating is wet displaces it. Pipe flashings, cones, exposed metal joints and flanges then receive #800 Elastic Cement and polyester fabric in a three course method. Corners at curbs and skylight flashings, and any area previously repaired with roofing mastic, receive #800 as well. Two top coats follow once the membrane has dried. Each is ElastaHyde at 1 1/2 gallons per 100 sq. ft. and they are laid at right angles, with 24 hours of drying after the first. A final reflective coat of 1 1/2 gallons per 100 sq. ft. completes the system.

Base flashing is one 6 inch ply of polyester, or wider if needed, over the cant strip in ElastaHyde at 3 gallons per 100 sq. ft. per ply. It stops at least 2 inches above the cant and extends at least 2 inches onto the deck. The wall flashing is a full ply that runs up the wall under counter flashing, reglet or wall cap flashing and reaches at least 3 inches beyond the end of the base flashing on the deck. At roof drains, the clamping ring comes off and the sump is three coursed with #800 or #8000 All Weather Elastic Cement for at least 18 inches from the drain center. The membrane then overlaps the reinforced cement and is cut around the ring. #8000 is a solvent-based white sealant for wet conditions, and it is the only cement used under a new pipe flange.

The system is water based. Application takes place at a minimum of 55 degrees F and rising. Application is not attempted when rain, inclement weather or temperatures below 40 degrees F are expected within 48 hours. Ice or frost on the roof surface or deck rules out application. The preparation and repair portion that has no water based materials may go on immediately before inclement weather.

Materials are protected from inclement weather before and during the project, and lids stay tightly closed on containers not in use. Roll materials are handled so that edges and ends are not damaged.

ElastaHyde 720 ARC is a 100 percent acrylic coating that meets ASTM D6083. The white has a solar reflectivity of 84 percent and an SRI of 106 initially, falling to 93 aged, measured to ASTM E1980-01. Flammability is rated Class A under U.L. 790 and ASTM E108 when dry. The coating's permeance is below 15 (ASTM D1653), and it shows no growth in fungi resistance testing (ASTM G21). 1000 hours of xenon arc exposure is a Pass under ASTM D4798. #800 Elastic Cement is applied by the three course method at 1/8 inch per 100 sq. ft. for the first coat (20 sq. ft. per gallon) and 1/16 inch for the second, so 8 gallons per 100 sq. ft. in total. This leaves a finished membrane of about 1/8 inch. It is not applied at 3/16 inch or more in one pass. These products form a reinforced liquid-applied roofing membrane with the acrylic coating.

The ElastaHyde 720 ARC coating comes in three Cool Roof Rating Council rated colors. Custom colors can also be produced.

• White, CRRC product ID 0682-003: solar reflectance 0.84 initial and 0.75 weathered, thermal emittance 0.89 initial and 0.91 weathered, SRI 106, SRI 93 after 3 years aged
• California Tan, CRRC product ID 0682-005: solar reflectance 0.80 initial and 0.75 weathered, thermal emittance 0.90 initial and 0.86 weathered, SRI 100, SRI 92 after 3 years aged
• Platinum Gray, CRRC product ID 0682-004: solar reflectance 0.76 initial and 0.72 weathered, thermal emittance 0.90 initial and 0.86 weathered, SRI 94, SRI 88 after 3 years aged

White, Platinum Gray and California Tan are the colors that meet the ENERGY STAR guidelines. A quick set version, #720 QS, is made for application when damp, wet or rainy weather is expected. The coating is also used on existing spray polyurethane foam roofs and conventional and modified built-up roofs.

• Solids: 53 percent by volume, 66 percent by weight
• Weight per gallon: approximately 11.5 to 12 lb
• Elongation: above 250 percent initial and above 175 percent after weathering (ASTM D2370)
• Tear resistance: above 100 lbf/in (ASTM D624)
• Water swelling: below 20 percent (ASTM D471)
• Low temperature flexibility: pass at 15 degrees F, 1/2 inch (ASTM D522)
• 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
• Coverage: 75 to 100 sq. ft. per gallon per coat
• Dry thickness: 20 mils minimum, 24 or more mils recommended
• VOC: actual 10, regulatory 20
• Containers: 5-gallon pails, 55-gallon drums, totes and bulk

• #970 A2A Bonding Primer: clear acrylic primer for acrylic to asphalt adhesion on smooth BUR, emulsion and non-granulated modified bitumen; not required for granulated surfaces or PVC membrane
• #800 Elastic Cement: water based acrylic flashing and sealing compound in white or black; 65-70 percent total solids by weight; elongation greater than 500 percent; minimum application temperature 50 degrees F; tack free in 1 hour; cure time of 1 to 2 days
• #8000 All Weather Elastic Cement: solvent-based white sealant for asphalt BUR, modified bitumen, metal and single ply roofs including EPDM, PVC, TPO and Hypalon, used where wet conditions are present
• #850 SWS Walkway Coating: water based acrylic coating with an aggregate that forms a textured non-slip surface on smooth and coated roofs
• Polyester fabric: 2.75 ounce firm or 3.0 ounce soft stitchbonded fabric in various widths