Gaps around ceiling boxes must be sealed with an intumescent fireblocking caulk or foam. Ordinary spray foam burns too quickly, opening the gap and creating a chimney effect that feeds the fire .

The booth is built from a single 40″ x 60″ sheet of 1/2″ foam core board, a furnace filter, and a vent fan modified to fit his shop’s system. The whole thing cost less than $200, most of ...

People are putting their homes at risk by using rogue companies that offer spray foam insulation, according to one of the UK's largest mortgage providers. Nationwide Building Society says ...