We just purchased a 100 year old home..when we removed The old wall paper from interior walls we found sold wood walls.. Appears to be 1 x 12 cedar but not sure its kind of red in color..We are wanting to keep the wood walls but not sure if we should tret them or if its best covering them up.. What is the best thing to use to protect the wood and to prevent mold or is it best to cover with Sheetrock.