Frame in a bench and waterproof it's exterior with something like prova board, use something like prova joint to waterproof the seams. No water should get to the framing wood. If you are worried water will get past the waterproofing you can always use pressure treated wood for the framing.
omeara4pheonix t1_je7wjgr wrote
Reply to concrete shower pan with corner bench -- but forgot to build bench. what to do? by jaaassshhh
Frame in a bench and waterproof it's exterior with something like prova board, use something like prova joint to waterproof the seams. No water should get to the framing wood. If you are worried water will get past the waterproofing you can always use pressure treated wood for the framing.