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Discuss Is it worth applying a liquid dpm or tanking bathroom floor before tiling? in the Tanking and Wetrooms Forum area at TilersForums. The USA and UK Tiling Forum (Also now Aus, Canada, ROI, and more)




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I have a ground floor bathroom with a concrete floor with no DPM sheet (was an old coal outhouse that's been bolted onto the Victorian house via a short walkway). Two external walls approximately 3m x 1.2m

I've dug the outside ground level deeper than the inside level, sorted new guttering and adding proper drainage outside. I've had the outside and inside re-rendered (sand and cement render, with SBR and waterproofer) and DPC injected. Also installing an extraction fan for what it's worth.

My bathroom fitter said its unnecessary. He said doesn't need tanking is it's not a wet room (normal shower tray), he said he'll tank the shower tray area only. He said he'd seal the floor with SBR before laying the tiles.

I'm having it self leveled in a few days, I spoke to my self level guy and damp guy and they both weren't really enthusiastic on doing any more measures.

I can't really say if the floor has a history of being damp as I've not had it long and rain was getting in through the walls before the re-rendering (heavy driving rain has been constant) and also got bit wet after plumbing work though between the few days of rendering and plumbing it was definitely drying out.

Just wondering as it hasn't got a physical DPM should anything be done? Want to get it done properly.

So much conflicting advice on the internet.
 

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