Is Backerboard fireproof?
Consequently, is Hardibacker fireproof?
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".
One may also ask, does Hardie board have a fire rating? While JamesHardie® products will not ignite when exposed to direct flame or contribute fuel to a fire, heat will transfer through them. Because of this, the product itself is not 1-hour fire rated. However, they do qualify for use in certain 1-hour fire rated Warnock Hersey and UL assemblies.
Regarding this, is Permabase fireproof?
section01350/. UL approved for heat shield/wall protector per ANSI/UL 1618 and ULC 632. Protects combustible walls. Reduces required clearance from wall by 40 percent.
Is Wonderboard flammable?
Fire safety Wonderboard. Contrary to popular belief, the Wonderboard products are fireproof and they have a fire class C s3 d0 and B s2 d0 and the standard in accordance with EN 13501-1.