PVC and EPDM RubberThane

PVC and EPDM RubberThane is a Kool Coats coating system for restoring existing PVC and EPDM single-ply roofs in the USA market. The system combines a TS-400 KwikShot Rubber base with a U-701 Aliphatic Urethane Topcoat, applied over a prepared membrane.

The rubber layer gives the roof a flexible base, and the urethane layer adds an abrasion-resistant protective finish for roofs that see maintenance traffic and demanding exposure. The system belongs to the PVC and EPDM family and is one of the low-slope roof waterproofing coatings in the Kool Coats range.

The assembly is applied in a fixed order over the identified membrane.

• Existing roof: a serviceable PVC or EPDM membrane
• Preparation: cleaning, repairs, adhesion tests and the specified primer
• Base coat: TS-400 KwikShot Rubber
• Finish coat: U-701 Aliphatic Urethane Topcoat

P-313 is an EPDM bleed-block primer for acrylic or silicone coatings. RP-105 is a Kool Coats cleaner sold as Rinseable EPDM Cleaner.

The assembly has its own coat sequence and cure intervals. The coverage rates of the individual components are not added together to give a system rate.

RubberThane is organized into 10-, 15- and 20-year builds. The published overall range for the combined rubber and urethane assembly is 45 to 95 mils dry-film thickness. That range belongs to the assembly as a whole and is not divided between the two coats.

Each tier has a written layer-by-layer schedule for the base, the finish and the total build. At component level, the TS-400 coverage rate is 1 gallon per 100 sq ft at 30 mils wet film thickness, and the U-701 coverage is approximately 4.1 to 8.2 lb per 100 sq ft, applied in one or two coats.

TS-400 KwikShot Rubber is a water-based, non-silicone liquid rubber. It is sold as a sprayable seam prep for commercial acrylic and urethane roof systems and is sprayed on seams, laps, fasteners, flashings and transitions.

• Rated 100% waterproofing at 30 mils dry film thickness
• Elongation of up to 1200%
• Not thinned before use
• Supplied in tote, drum, 5 gallon and 1 gallon containers
• Tools and equipment are cleaned with water after use

Unused product is stored in the original container, tightly sealed.

U-701 is a single-component, water-based, aliphatic polyurethane coating used as a protective finish over compatible waterproofing membranes. It cures to a UV- and color-stable surface for exposed applications and light pedestrian traffic areas. The aliphatic chemistry does not yellow or chalk.

Measured values for the cured film:

• Tensile strength: over 1,450 psi
• Elongation at break: 250%
• Hardness: over 80 Shore A
• Wear resistance: 0.39 mils
• Impact resistance: 14.5 ft-lbs
• Pull-off adhesion: over 65 psi
• Volatile organic content: under 100 g/l

U-701 is packed in 5 gallon, 3 gallon and 1 gallon containers. Pails are stored in a dry, cool area for up to 12 months at 41 to 86 degrees F, out of moisture and direct sunlight, and protected from freezing.

U-701 goes on by roller, brush or airless spray in one or two layers, depending on the wear conditions expected. The interval between two layers is 3 to 6 hours and not more than 8 hours. Application is not made below 40 degrees F or when dew, rain or frost is expected within the next 48 hours, and application and cure are carried out between 40 and 95 degrees F.

The cured urethane is slippery when wet. Suitable aggregate sprinkled onto the still-wet coating gives an anti-slip surface.

TS-400 is applied between 50 and 90 degrees F on a warm, dry surface, with the surface temperature 5 degrees F above the dew point and rising. It is not applied over wet substrates.

Kool Coats offers a 10-20 year Material Warranty on TS-400. A 10-20 year Labor and Material Warranty is available for a fee. The warranty covers the original purchaser only, is non-transferable and requires valid proof of purchase.

Maintenance guidance for the coating is an inspection at least twice a year, and again after severe weather or extraordinary maintenance on roof-mounted equipment.

The rubber is water-based and low in VOCs, with membrane strength of up to 1,540 psi. It is applied in four steps.

1. The roof is cleaned and gaps, cracks and areas larger than 1/8 in are located.
2. Larger gaps are filled with the KwikShot caulking grade.
3. KwikShot is sprayed across all seams and detail areas.
4. A topcoat is applied over the rubber.

U-701 is a water-based, low-VOC aliphatic polyurethane topcoat in white only, in a 5 gallon container. It protects exposed waterproofing membranes in light pedestrian traffic and service access areas over urethane systems.