Fire Retardant Treated Wood Ibc

Fire retardant treated wood complying with section 2303 2 shall be permitted for use as a substitute for noncombustible materials in exterior wall assemblies with a 2 hour fire resistance rating or less.

Fire retardant treated wood ibc.

Construction types iii iv and v may be framed exclusively with wood but exterior walls in types iii and iv buildings are required to be fire retardant treated wood frtw. Chapter 23 governs the materials design construction and quality of. New language in the 2018 ibc clarifies for building officials the regulations for using frtw in types i ii and iii construction which call for the use of non combustible. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Construction types i and ii are defined in ibc section 602 as having all elements of non combustible materials except where permitted in ibc section 603. The code outlines the qualifications for fire retardant treatment the testing required to confirm the protection required strength adjustments and required fasteners for use. Fire retardant treated wood is any wood product which when impregnated with chemicals by a pressure process or other means during manufacture shall have when tested in accordance with astm e 84 or ul 723 a listed flame spread index of 25 or less and show no evidence of significant progressive combustion when the test is continued for an additional 20 minute period. Ibc section 602 3 type iv construction heavy timber ht fire retardant treated wood complying with section.

Spread of fire by the wood is eliminated. The 2018 international building code clarifies that fire retardant treated wood frtw manufactured without using the pressure process must be impregnated with chemicals. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Code requirements related to fire retardant treated wood are located in two places in the ibc.

Dricon introduced in 1981 is a class a fire retardant and preservative intended for wood used in interior weather protected construction this effective treatment is applied during manufacture creating a built. In section 2303 2 the ibc defines fire retardant treated wood as any wood product which when impregnated with chemicals by a pressure process or other means during manufacture shall have when tested in accordance with astm e 84 a listed flame spread index of 25 or less and show no evidence of.