HandiFoam's E84 System8 8Gal HFO Spray Polyurethane Foam Insulation (P23000) strengthens building envelopes by sealing air leaks, resisting moisture, and contributing to fire safety. Classified as ASTME84/Class1 fire rated at 2.5in. thickness, this foam resists flame spread and smoke development under fire exposure. Its density and closedcell structure provide moisture resistance, mould and mildew control, and minimal water absorption. Covering roughly 1,015 board feet in theoretical yield (realistic yields somewhat less depending on application thickness and substrate), the System8 is efficient for midsized jobs, retrofit insulation, crawlspaces, and other cavity fills. The fast tackfree and cure times keep installations moving.