Cement Board Siding Fire Rating

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.

Cement board siding fire rating.

However using fiber cement board like hardieboard is acceptable in locations including the mantel and fireplace surround. This does not mean that clearances to combustible building materials can. Many fiber cement products carry a class a fire rating meaning that they can withstand several hours of heat before melting down. Hz5 climate zones 1 5.

Fiber cement siding stormed onto the scene a few decades ago and revolutionized the house siding industry because it possesses the best of many worlds. Are your products 1 hour fire rated. Hardietrim boards hardiesoffit pre cut panels artisan by james hardie hardiewrap weather barrier hardiebacker cement board. James hardie uses what it calls the hardiezone system.

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. 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. The predominance of wood in the mix makes smartside siding more susceptible to fire though it does have a 1 hour fire rating. 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.

Unlike wood it is fire resistant. Fiber cement siding maintenance. On 2 x 8 common plate 3 1 2 thermafiber safb both cavities joints taped. 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.

Fire ratings the hardiebacker board is made with a quarter inch thickness so that it can serve as fireplace facing. Fiber cement siding maintenance. Here are the main installation considerations with respect to the choice of materials. 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.

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.