Most of the wood used in house construction is not treated with anything. Only the stuff that touches soil, foundations, or is exposed to elements is. Unless yo

Most of the wood used in house construction is not treated with anything. Only the stuff that touches soil, foundations, or is exposed to elements is. Unless you use real wood siding, that’ll be less than 5% of all lumber used. It doesnt decay, because it’s kept dry, and microorganisms arent very good at decomposing dry wood.