Ure-A-Max

Ure-A-Max is the hybrid urethane roof restoration system from American WeatherStar for flat and low-slope commercial roofs. It is classed as a commercial roof coating system for commercial roof restoration. A silver Aromatic Urethane 520 base coat is paired with an Aliphatic Urethane 510 top coat, and seams and flashing details are coated with Urethane Brush-Grade 522.

Suitable substrates are spray polyurethane foam, modified bitumen (smooth and granulated), built-up roofing, TPO, PVC, EPDM and structural concrete. It coats entire roofs, makes spot repairs and adds protection at flashing. Separate application guidelines cover modified bitumen, single-ply, EPDM, built-up roofing and concrete.

1. Existing roof substrate, pressure washed to remove dirt, dust, debris and contaminants.
2. Urethane Brush-Grade 522 on all seams and flashing details.
3. Aromatic Urethane 520 base coat, which acts as a primer and bonds to the substrate.
4. Aliphatic Urethane 510-CA top coat, which forms a rubber-like membrane with increased resistance to moisture penetration.

Warranty terms of 10, 15 and 20 years are marked for the system. An adhesion test of the Aromatic Urethane 520 base coat on the existing substrate is recommended.

Aromatic Urethane 520 is a high-solids, single-component, moisture-cure polyurethane elastomeric coating. It was developed for protecting sprayed-in-place polyurethane foam and is also used on EPDM, modified bitumen, single-ply membranes, wood, concrete, masonry and most metals. Published data:

• Solids by volume: 70 percent plus or minus 2
• Elongation: 475 percent plus or minus 50 on the data sheet; 350 percent plus or minus 50 in the system guidelines
• Tensile strength: 715 plus or minus 25 psi on the data sheet; 975 plus or minus 25 psi in the guidelines
• Viscosity: 2,000 cps
• Weight: 9.2 lbs per gallon; flash point 80 degrees F; hardness 65, Shore A
• Permeability: 0.02 perms; water absorption 2.4 percent
• Dry times: to touch 6 hours, tack-free 8 to 12 hours, recoat 12 to 16 hours
• Service range: -50 to 200 degrees F; shelf life 18 months

It is silver, packed in 5 gallon and 55 gallon sizes, applied by medium nap roller, soft brush or airless spray, minimum 40 degrees F, and cleaned up with xylene. Storage is between 40 and 100 degrees F in a dry place.

Aliphatic Urethane 510-CA is a single-component, moisture-cure aliphatic polyurethane. It is bright white over single-ply and EPDM and white elsewhere. The lower moisture vapor permeability of 0.9 perms, together with the UV stability of the aliphatic chemistry, is what the top coat contributes to the system. Published data:

• Solids by volume: 76.7 percent
• Elongation: 230 percent; tensile strength 2,300 psi
• Viscosity: 100 KU; weight 10.77 lbs per gallon
• Hardness: 85, Shore A; water absorption below 2 percent
• Flash point: 93 degrees F
• Dry times: to touch 6 hours, tack-free 12 to 16 hours, recoat 18 hours
• Service range: -50 to 200 degrees F; shelf life 1 year
• Clean up: acetone; packaging 5 gallon

Top coats go on within 48 hours of the base or an intermediate coat, and application is suspended below 40 degrees F.

• Urethane Brush-Grade 522. A thick, high-solids, single-component moisture-cure polyurethane developed from Aromatic Urethane 520 as a mastic. It has 69 percent plus or minus 2 volume solids, viscosity of 30,000 to 40,000 cps, 350 percent plus or minus 50 elongation and 975 plus or minus 25 psi tensile strength, and is silver. It is applied by heavy brush, may be thinned up to 6 percent by volume with xylene, and cures in about 24 hours at 60 degrees F and 40 percent relative humidity.
• Aromatic Urethane 508. A dark gray base coat with 725 plus or minus 50 psi tensile strength and 6,000 cps viscosity, listed in the concrete, EPDM and other guidelines. It has to be top coated with Silicone 410, High Solids Silicone 412 or Aliphatic Urethane 510.
• Polyester fabric. A non-woven, 100 percent polyester fabric with 35 psi tensile strength, 100 percent elongation, 22 mils bulk, 11 lbs per square and widths from 2 to 36 inches.

Polyurea 550 is a 100 percent solids polyurea combining aliphatic and aromatic polymer technology. It is applied with heated plural-component equipment with the A and B sides at 160 degrees F. Published data:

• Tensile strength: 2,800 plus or minus 200 psi
• Elongation: 600 percent plus or minus 50
• Hardness: 75 plus or minus 5, Shore A
• VOC: 0 g/liter; flash point above 300 degrees F
• Viscosity: 800 plus or minus 100 cps (A component), 400 plus or minus 100 cps (B component)
• Dry time: 40 seconds; recoat window under 24 hours; complete cure 30 days
• Coverage: minimum 5.0 gallons per 100 square feet (80 wet mils)
• Colors: tan and dark gray; 105 gallon kits; shelf life 6 months

It bonds to metal, single-ply roofs, wood and concrete without primer and is intended for containment, steel protection and tank applications.

• Pre-inspection covers HVAC flashing, drainage, seams, terminations and reglets, roof penetrations, water leakage, sign or display anchorage, drains and their location, parapet roof detail, wet or damp insulation, and coping and flashing.
• Pressure washing at 3000 to 4000 psi is recommended.
• EcoCleaner 925 is diluted 5:1, applied at 1 gallon per 150 square feet, and followed by a minimum 3,000 psi wash and full rinse.
• Loosely adhered coating is removed before application.

Urethane coatings on low-slope roofs belong with flat roof waterproofing. American WeatherStar warrants that supplied material meets or exceeds published properties, and each job is approved by American WeatherStar before it begins.