Damp Proofing

Is it worth applying a liquid dpm or tanking bathroom floor?

Anonymous user 28/02/2024 - 3.46 PM

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 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 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 it's damp as walls were leaking 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. EDIT: Just to add answers to first poster. I don't know about salt inhibitor but he definitely added waterproof. He's a time served plasterer with a great reputation. He used a sand and cement render, with SBR and waterproofer and it's not touching the floor. Not been tanked though. My bathroom fitter said he'd use SBR to seal the floor (forgot what it was called when I mentioned sealing the floor previously).