I live in a 1970's vintage ranch house over a crawlspace. I am renovating the master bathroom. The floors were tile over a inch and a half thick motar bed. The subfloor in the shower was rotten and had to be replaced. The rot extended under part of the tile in the room itself. I have removed the motar bed in the entire bathroom. The remaining subfloor is only 1/2" thick and quite bouncy.
My question is: After repairing the rot, can I add a second layer of 1/2 plywood to stiffen up the floor? I intend to tile the floor over cement board.
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