A New Fire-Retardant Treatment for Western Redcedar Shingles

A new leach-resistant fire retardant treatment consisting of melamine, dicyandiamide, formaldehyde and phosphoric acid has been developed for western redcedar shingles. Roof decks made with the treated shingles were subjected to Class B and C fire tests (ASTM E-108) e.g., intermittent flame exposure test, spread of flame test, and the resistance to burning brand test. These shingle decks passed the requirements for a Class C roof covering material as specified by the above tests both before and after having been subjected to a permanence of treatment test. In the case of Class B tests the treated shingles failed to meet the requirements of the intermittent flame exposure and the resistance to burning brand tests. The new treatment was successful and did not significantly detract from the natural appearance of shingles.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member