Masonry Noncombustible Construction (ISO) - one of six building construction categories established by Insurance Services Office, Inc. (ISO), in its Commercial Lines Manual (CLM) for purposes of developing rates for insuring commercial property, based on susceptibility to damage by fire.Is cement board considered non combustible?
Yes, HardieBacker® 1/4" Cement Board is deemed noncombustible when tested to ASTM E 136 and can be used in conjunction with other noncombustible materials around a fireplace. This does not mean that clearances to combustible building materials can be reduced by using HardieBacker 1/4".Can treated wood be non combustible?
The treated wood is also considered a non-combustible material by many building codes. They also offer a blue-stained version of their products perfect for building sites with multiple varieties of lumber.