Heatlok HFO Pro by Huntsman Building Solutions is a closed cell spray foam insulation that can be used as continuous insulation, optimizing the structure’s building envelope to protect against air, thermal, water, and vapor. It offers high adhesion and compressive strength and can be used in new construction or retrofit applications, including basement walls, crawl spaces, exposed floors over unheated spaces, unvented attics, and more.

Heatlok HFO Pro meets Class 5 FEMA flood damage resistance requirements (the highest rating available) and is Greenguard Gold certified for low VOC emissions. It’s NFPA 285 tested and approved behind multiple claddings, including metal and aluminum. It also leverages Honeywell’s Solstice HFO Liquid Blowing Agent technology, which has a Global Warming Potential (GWP) rating of 1—99.9% lower than traditional blowing agents.