Fire Retardant Treated Wood Ibc

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.

Fire retardant treated wood ibc.

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. 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. 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. Ibc section 602 3 type iv construction heavy timber ht fire retardant treated wood complying with section.

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. The international building code ibc defines the specifications for manufacturing and using fire retardant treated wood in construction. 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.

Chapter 6 of the ibc details under what circumstances fire retardant treated wood is permitted and the acceptable exceptions to these rules. Spread of fire by the wood is eliminated. The code outlines the qualifications for fire retardant treatment the testing required to confirm the protection required strength adjustments and required fasteners for use. The 2018 international building code clarifies that fire retardant treated wood frtw manufactured without using the pressure process must be impregnated with chemicals.

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. 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.