New answers tagged patch
Dig out any rotted wood that you can get to. Soak the wood with wood hardener around the patch area to stabilize the rotted/deteriorated wood that you couldn't get to. Fill with bondo or wood filler in 1/4" layers until slightly bulging from the patch area. Chisel/file/sand down when the final layer is almost completely dry with a sanding block. Prime ...
I have a similar problem, but worse. I think im going to put concrete backer board, like what they use to tile bathrooms, on the outside of the edge of the porch, then cover it up with the morter you see covering the edge of your concrete already. To attach it, ill drill holes and use anchor nails or screws and adhesive.
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