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Unread 09-20-2021, 12:30 PM   #1
Home Remodeler
Join Date: Apr 2017
Location: Cincinnati, OH
Posts: 93
24" O.C. I-joist with OSB subfloor

Getting ready for a master bath remodel. I remodeled the kitchen a couple of years ago and found the house was built with 24" OC I-joists. We had to replace the subfloor in places since I believe the tile trapped moisture from the basement and caused the subfloor to fail. The subfloor was ~3/4" nominal OSB IIRC.

In the master bath, I will be installing plank tiles in the main walking area with a pebble floor under a freestanding tub. In reviewing the TCNA manual, the closest spec I could find was F155-21. It recommends a 23/32" exterior glue plywood underlayment. However, it states 8"x8" and larger tile only. Should I be worried about the pebbles? Any recommendations for a more robust floor assembly? I'm going to have to remove some of the flooring to relocate the shower and tub drain, so subfloor replacement is within reason.
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