Cement Board Siding Fire Rating

Fiber cement siding maintenance.

Cement board siding fire rating.

James hardie uses what it calls the hardiezone system. Nichiha s robust architectural wall panel rainscreen system and thick sierra lap board are ibc code compliant for use as exterior cladding in fire resistance rated wall assemblies. A durock panel with a thickness of 1 2 or 5 8 inch can provide two hours of fire protection when installed correctly and in conjunction with all fireproofing. An alternative to vinyl siding fiber cement a mixture of cement sand and wood fibers manages to achieve very high fire resistance without sacrificing convenience and durability.

Two hour fire rated construction chase walls steel framed acoustical performance construction detail description test number stc test number 9 1 2 usg durock brand cement board and 1 4 ceramic tile two rows 2 x 4 wood studs 16 o c. Hz5 climate zones 1 5. The predominance of wood in the mix makes smartside siding more susceptible to fire though it does have a 1 hour fire rating. This does not mean that clearances to combustible building materials can.

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. It can be used as part of a hour long fire wall which is a wall that can resist a fire for up to an hour. Fire ratings the hardiebacker board is made with a quarter inch thickness so that it can serve as fireplace facing. The exact fire rating of durock is dependent on the other materials used during construction but a panel 1 4 or 1 2 inch thick typically provides an additional hour of fire protection.

Here are the main installation considerations with respect to the choice of materials. However using fiber cement board like hardieboard is acceptable in locations including the mantel and fireplace surround. Unlike wood it is fire resistant. On 2 x 8 common plate 3 1 2 thermafiber safb both cavities joints taped.

Icc es ner 405 fire resistance rated wall assemblies ner report ner 405 click the link above and go to section 3 5 of ner 405. Hardietrim boards hardiesoffit pre cut panels artisan by james hardie hardiewrap weather barrier hardiebacker cement board. This means that coupled with other fire resistant building materials including insulation and framing fiber cement siding will withstand fire and in some cases even increase the assembly s overall fire resistance. It offers the look of authentic wood shiplap siding even with lookalike textured wood grain.

Fiber cement siding maintenance.