Once the bark is taken off the tree the wood has no way of protecting itself. The damaging effects of weather to unprotected wood can begin immediately. Rain, melting snow and morning dew are quickly absorbed by unprotected wood causing it to swell. The sun’s heat causes drying, which makes the wood shrink. These cycles of wet and dry, swelling and shrinking, cause wood to warp, split, cup and crack – all of which lead to shortened wood life and expensive repairs and replacement.