Pressure-treated deck boards that contain fire retardants—along with other chemicals—tend to leach toxins over time, degrading both the environment and the stability of the wood. That's not the case with TimberSIL, a toxin-free alternative created by soaking lumber in liquid glass and then baking it. The lumber, which has a Class A fire rating, resists rot and insects and can be cut and stained just like regular wood decking. $1.50 per lineal foot. Timber Treatment Technologies,
Springfield, VA; 703-644-0991.