I have to fix up six posts holding up a roof overhang, the bottom few inches
are rotted. They look like an I-Beam with a 4x6 core and 2x6 sides and are
rotted at the bottom. The top goes into a beam pocket which I prefer not to
mess with. The posts sit on an elevated wood deck that I am re-building--so
assume the new substrate is 2 layers of ply, which I will then add cement
board, water-proof membrane, and tile to.
My idea was to saw off the bottom 4 inches and build a little square plinth
underneath. But what to use?
One idea is to simply cast in place with concrete, then get the waterproof
membrane a couple of inches or so up the concrete sides before tiling.
Anyone used this method before? Any problems to anticipate?
Another idea is to put an undersize block of wood under the post, then seal
the sides and smooth to match with Bondo, WoodEpox or some such. I have
never tried this before either?
I would most appreciate your thoughts and experience on this.