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What are the fire rating properties of expanded polystyrene and rock and wool insulation?

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2009-05-21 18:45:25

Gosh, I couldn't say...but, if you're asking because you're

trying to choose which one to use I have to say DONT use

polystyrene..not in the loft anyway! In the loft, the beads will

attach themselves to your wiring, over time, and eat their way

through them. And are a fire hazard. BUT, if it's for in your

walls, I believe polybeads have a higher u-value thus insulate

better. Rockwool is a very good product though, been around for

decades, is inert and also used in hospitals (internal walls) to

stop the spread of fire.

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