Before you begin working with pallet wood, you need to establish that it’s safe for the project you’re undertaking. Pallets are sometimes treated with dangerous pesticides to preserve them, and even safely treated pallets may be exposed to dangerous chemicals during their lifetime. There’s also the risk that the wood may be damaged or infected with rot which can weaken it. If you can’t establish if the pallet you have is safe or not, do not use it for indoor projects such as headboards and furniture, or for garden projects like planters if you expect food may be grown near the wood. Never burn questionable pallet wood or treated lumber in your fireplace or outdoor fire pit.