Create a fire-safe zone around wood decking.
Although decking products not treated with fire retardant are combustible, some decking is not highly combustible on its own, according to Cal Fire. Typically, other fuel sources, such as plant debris or other combustible materials stored under or on top of the deck, as well as combustible vegetation surrounding it, contribute to deck fires. Keep this in mind during fire season, and maintain your decks to keep them free of easily-ignited materials such as leaves and needles that accumulate between the deck boards, along the home’s siding and below the deck.
If you have your heart set on a new wood deck, look for wood that is treated with a fire retardant or other fire-resistant building material. Hardwoods from South America, such as ipe and cumaru, have high fire resistance (and many are sustainably farmed). A fully enclosed deck will offer added protection by eliminating a heat trap below it.
Another good tactic is to isolate the deck from fire by adding noncombustible materials, such as stone, concrete or gravel, along the front sides and below the deck to create a fire barrier.