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Fire-Retardant Treated Wood in Roof Structures

This apartment complex was designed to be constructed as a non-combustible building using a proprietary wall system and steel trusses with a metal roof covering.

Although this complex could have been built of combustible materials, the owners chose this type of construction to qualify for reduced fire insurance rates.

During construction it was realized that the lead time for steel trusses would put the project behind schedule and that fire-retardant treated wood trusses and sheathing with shingles would accomplish the same results and keep the project on schedule.
With the approval of the architect, owner, and code officials the switch was made to FRTW (fire-retardant treated wood) trusses. The delay was avoided and the project was completed on time.

By using FRTW trusses and sheathing, the owner received a 20-year warranty on the product.

Insurance Recognition
Fire-retardant treated wood is recognized by the insurance industry as slow burning and can result in reduced insurance rates when used in lieu of untreated wood.

Code Section
SBCCI Standard Building Code, Table 600, Note e: FRTW can be used in the roof structure in noncombustible buildings up to two stories in height.

BOCA National Building Code, Table 602, Note d: FRTW can be used in the roof construction of Type II non-combustible buildings.

ICBO Uniform Building Code: There is no parallel provision for this use. FRTW can be used in the roofs of combustible buildings.