Heatlok XT closed-cell spray-foam insulation contains more than 20% renewable and recycled content and can contribute to LEED points. The product’s winter formulation can be sprayed at temperatures as low as 10 F. Sprayability offers a 2-in.-on-2-in. application. Within seconds of spraying 2 in. of foam, another 2 in. can be sprayed over the first application. In ASTM-E-84 testing, the insulation reportedly scored a zero in fire resistance and flame spread.