Gravel BUR Acrylic

Gravel BUR Acrylic is a Kool Coats restoration system for sound gravel-surfaced built-up roofs (BUR) in the USA market. Its coating chemistry is acrylic. A TS-400 KwikShot Rubber base is covered by a reflective TS-505 TopShot EDGE acrylic topcoat.

The rubber base follows the uneven asphalt surface, and the topcoat is the exposed finish. The system is one of the acrylic restoration coatings for flat roofs in the Kool Coats range.

Loose gravel is removed, the exposed roof is repaired, and the specified KwikShot rubber base is applied across the prepared surface. The selected TopShot acrylic finishes the system. Coating quantities follow the real profile of the roof and not floor area alone. Drainage and surface irregularity are checked before quantities are estimated.

The system works on irregular, uneven vacuumed BUR surfaces. The spray-grade KwikShot rubber base has 1200% elongation and needs no fabric, and UV-stable acrylic topcoats finish it. It is intended for non-critical or short-hold buildings.

TS-400 is a water-based, non-silicone liquid rubber that bonds to properly prepared roof surfaces. Its coverage rate is 1 gallon per 100 sq ft at 30 mils wet film thickness. The rubber is topcoated with a Kool Coats acrylic or urethane coating for all exterior vertical wall exposures.

• Not applied if the temperature is expected to drop below 32 degrees F within 24 hours
• Not applied over wet substrates
• Not applied in high heat areas of 180 degrees F or more
• Not thinned

TS-505 is an elastomeric acrylic coating with high solids content and enhanced elongation. It is described for 15-plus year systems and high-build, one-pass commercial restorations. The reduced filler content of the formulation lowers yellowing and raises UV stability.

• Solids by weight: 62%
• Solids by volume: 52%
• Weight per gallon: 10.8 lbs
• VOC: under 50 g/L
• Tensile strength: 300 psi
• Elongation: 360%, nominal
• Tear resistance: 105 lbs/in
• Hardness: 65 Shore A
• Cure time: 24 to 48 hours at 77 degrees F and 50% humidity

The surface is clean and dry before coating. Chemical cleaners, power washing or priming may be needed on some substrates. Damaged membranes, flashings and penetration points are repaired and sealed, and low ponding areas are repaired. Application temperature is 50 to 100 degrees F, and the cured film serves between 15 and 180 degrees F.

The coating is not applied below 40 degrees F or when rain is expected within four hours. It dries in 1 to 4 hours, and the next coat goes on as soon as the previous one can safely be walked on. Shelf life is 12 months from manufacture in unopened containers between 40 and 100 degrees F, with freezing prevented.

Kool Coats offers a 10-20 year Material Warranty on TS-400 and TS-505, and a 10-20 year Labor and Material Warranty is available for a fee. The warranty is non-transferable and made solely to the original purchaser. The roof is inspected at least twice a year, and straight after severe weather.