Wet wooden Sub-Floor in bathroom!

16 Sep 2004
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United Kingdom
Help! Last year I laid down a new wooden floor (floorboards) throughout my bungalow. I did this by sealing the concrete floor that was already there, laying down a damp proof membrane, a frame of treated battens on top of that and then the floorboards

In the bathroom I put chipboard down on the battens and tiled over that. I noticed that the grout I used (flexible wooden floor adhesive/grout ) was becoming cracked and basically looked crap, so I decided to take up the tiles and do it again with actual grout.

This morning I took up the tiles to discover the chipboard was soaked through throughout the bathroom and water was collecting on the dpm...

I am thinking my combination adhesive/grout is to blame. Am I right? After I have dried out, treated the sub-floor and laid new chipboard down, I am thinking of re-tiling and then grouting the whole floor with silicone sealant.

Does this sound like the right option? Or have I missed something?
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You are better of with thick ply. It's water resistant and doesn't flex as much.
While you have the floor up but a few extra battons down to make it flex less.

Or simply tile onto your concrete floor - but it will be colder.

Don't use silicone for grout.


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