This is more of a general construction question but this group always proves most helpfull.
I am installing pressure treated posts for a railing on an above-ground deck. Wanted to use cypress but it's just too damn expensive -
13.99/ft for 4x4 here in PA.The posts will have a half lap milled and then be attached to the rim joist, or what some call the header joists, around the perimeter of the deck. The problem I have is that the decking material is waterproof aluminum tongue and groove and slopes from the center of the deck to each edge to allow for drainage. Therefore water will be draining towards, and into the posts. What would the group recommend applying to the interior of the half lap joint to "delay" decay. My first thought was a petroleum based roofing tar product similar to what is applied to below grade concrete block and then a bead of silicone around the base of the post.
Anyone have alternative solutions or experiences?
Thanks, Dave