As a contractor I am very unhappy with the Timber Tech product 5/4x6. I currently have a deck where the butt joints are swelling, deck is discoloring, constantly mildewing, and starting to show some sag. This is after only 3 yrs. I have contacted the warranty dept. and they will not stand behind it. If anyone knows of a class action lawsuit, count me in. I would love to hear others comments on any of these problems.