DC315 Fireproof Paint for alternative Thermal and Ignition Barrier for Spray Polyurethane Foam (SPF) DC 315 is an intumescent coating applied over Spray Polyurethane Foam (SPF) to achieve a “15 Minute Alternative to Thermal Barrier” and “5 Minute Ignition Barrier.” DC315 is compliant to IBC & IRC codes; 3rd party inspected and listed by Warnock Hersey ( WN-20947), and meets the requirements of the AC456 criteria recently updated in AC377. DC315 has more than 200 tests worldwide over a wide variety of foams. It has one of the best coverage rates for foam at 115 sq ft/gallon, making it very cost efficient. Also available in 55 gallon drums.