3. Decay/Rot
Again, the size of timber posts and beams have more mass, and in the case of rot, they allow for a longer period of time before the post becomes unsound. Of course, rot is not desirable however, and there are a number of things that can protect against water decay and rot. The most basic principle is to KEEP WATER OUT.
Modern flashing methods are getting better for keeping water off of the beams, but it’s not always perfect. Good sized overhangs and excellent attention to flashing will protect beams from the elements. Another essential is leaving a half-inch space between the post and the concrete or stone that it is mounted on. Often, building stone bases for posts can help in this regard.
By maintaining your timbers and applying stain periodically, you can have timbers that last for a long time!
