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Old 03-20-2018, 09:47 AM   #1
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Join Date: Mar 2018
Posts: 1
Master Bathroom Remodel - Slat Flooring Question

Hey Everyone,

I've stumbled across this site which has been an amazing treasure trove of information for me as I work my way down the path of this bathroom remodel. However, I haven't been able to gleam a full understanding of the approach I should take with regards to the sub-floor I'm dealing with.

The sub-floor throughout our house is a mix of various size boards laid diagonally with spaces in between each board, not tongue and groove. I've already finished remodeling the four rooms and hallway in our second floor by replacing any broken boards, screwing down ever board to each joist, new paper and then 3/4 hardwood.

The bathroom, originally, had ceramic tile laid on top of a 3/4 mud bed, which I've just finished demoing.

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I need to replace the plumbing under this floor as the original plumber ran water pipes into soffits everyway in our kitchen and den. I'm going to move to Pex, but need to get access to below the subfloor. My main concern is that this sub-floor runs under the double bathroom wall, where the main stack is located, and also doesn't sit on a joist. The original builder basically made a large opening for all plumbing to run through. The opening is two, sistered 2x8's, approximately 30" apart. Then two 2x4's nailed 1-1/2" below the top of the joist and 2x4's laid perpendicular across the top of the 2x4's. The bathroom wall side sits on those.

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I'm trying to understand my options for cutting out some of these boards and replacing them.

Additionally, my plan is to throw a 1/2" plywood and a 1/2" cement board on top and then lay ceramic tile for the floor. I'm hoping the 1/2" plywood will be add to the strength of this floor, even though there is no noticeable flexing in this floor as is.

I appreciate any advice you can throw my way.

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