Attached decks are a vulnerable component of a building in wildfire-prone areas. Once ignited, decks can expose a building’s cladding (siding), wall components such as windows and doors, and the under-eave area to flames and radiant heat. This exposure can result in severe damage or destruction of the structure.
This report evaluates the assumptions in State Fire Marshal (SFM) Standard 12-7A-4A and ASTM E2632. These standards describe testing methods for evaluating deck materials performance when exposed to wildfire. The objective is to determine whether the assumptions in the test protocols adversely affect the evaluation of deck boards and whether they realistically assess the vulnerability of the entire deck assembly when exposed to under-deck flames.