bob the builder 2 Posted September 27, 2022 Share Posted September 27, 2022 Hi All Just looking at the bathrooms on the 1st floor of our timber frame It is posi joists and decking at the moment and i am trying to confirm if it can achieve a wet room with sunken shower trays Many thanks for your experiences (good and bad!) bob Link to comment Share on other sites More sharing options...
Russell griffiths Posted September 28, 2022 Share Posted September 28, 2022 Yes many ways to do it, just do a bit of research on the type of finish you want. Tiles or a tray all systems are different, so a basic run through is to lift the floor in that room and fit noggins on the sides of joists so your tray, or tray former sit down below floor height, so when you put appropriate floor back the tray is at the lower point. Need to look at type of former or tray and look at trap and waste position Everything is possible, just look at your finish and work back from there. Link to comment Share on other sites More sharing options...
ProDave Posted September 28, 2022 Share Posted September 28, 2022 Yes. We did two. We used the Impey wet room shower formers that are 22mm thick and match standard P5 chipboard flooring and the Impey Water Guard tanking system. Others are available. Link to comment Share on other sites More sharing options...
Thorfun Posted September 28, 2022 Share Posted September 28, 2022 2 hours ago, ProDave said: Yes. We did two. We used the Impey wet room shower formers that are 22mm thick and match standard P5 chipboard flooring and the Impey Water Guard tanking system. Others are available. I presume you cut out the P5 chipboard where the former went for it to be level with the chipboard? Link to comment Share on other sites More sharing options...
ProDave Posted September 28, 2022 Share Posted September 28, 2022 53 minutes ago, Thorfun said: I presume you cut out the P5 chipboard where the former went for it to be level with the chipboard? Yes P5 chipboard and shower former Tanking membrane Tiles 2 Link to comment Share on other sites More sharing options...
Thorfun Posted September 28, 2022 Share Posted September 28, 2022 2 hours ago, ProDave said: Yes P5 chipboard and shower former Tanking membrane Tiles perfect! just what I needed to see before I start going down the same route. thank you very much. Link to comment Share on other sites More sharing options...
ProDave Posted September 28, 2022 Share Posted September 28, 2022 Also worth noting the Impey Waterguard membrane is also a decoupling membrane so you can just tile onto it. 1 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 28, 2022 Share Posted September 28, 2022 5 hours ago, ProDave said: Also worth noting the Impey Waterguard membrane is also a decoupling membrane so you can just tile onto it. You need more arms than Vishnu to fit it without wrinkles . Bloody sticky stuff, but ridiculously bombproof, and excellent for a 1st floor install. Get more of it if funds allow and finish the room, with upstands, to get it utterly waterproofed. Is it 610? The stuff Impey give you in a mastic tube? It is the anti-Christ of sealants, and is STILL on some old combats and STILL wet / tacky to the touch! Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 28, 2022 Share Posted September 28, 2022 (edited) 23 hours ago, bob the builder 2 said: Hi All Just looking at the bathrooms on the 1st floor of our timber frame It is posi joists and decking at the moment and i am trying to confirm if it can achieve a wet room with sunken shower trays Many thanks for your experiences (good and bad!) bob They wont be “sunken” unless you have specified the posi-joists accordingly. Removing the deck board 22-24mm typical for P5 or Egger, and fitting an insert wetroom former will bring you flush to the existing floor. If you do not use the Waterguard system then you’ll need a 6mm ply binder to tile onto. Just remember to fit the same thickness ply under the former to raise it up to suit Edited September 28, 2022 by Nickfromwales Link to comment Share on other sites More sharing options...
bob the builder 2 Posted September 29, 2022 Author Share Posted September 29, 2022 All Thank you very much ! Which board would you reccomend for the walls. I want to get a bit of noise reduction as well so was thinking of the following build up Outer OSB Rockwool Acoustic plaster board Aqua board Tanking sealant and tape. Happy to be educated! thanks Bob Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 29, 2022 Share Posted September 29, 2022 The majority of the ‘nuisance’ sound / noise will be from the water hitting the tray / floor. Acoustic insulation under there is a good idea, plus any discharge pipework can be sound deadened if over a bedroom. Current clients new build, where I used Killmat over the waste and soil pipes. Takes a lot of the high frequency noise ( sound of water tricking ) away. As I’m doing a turnkey whole of house service I know I’ll be on the hook for any “issues”, so I’ve gone belt and 2 braces on the 1st floor bathrooms and the music / piano room to keep things as ‘quiet’ as possible. 🤞 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 29, 2022 Share Posted September 29, 2022 FYI. I had another layer of acoustic insulation installed between the posi joists before the plasterboard went on, so 150mm total between the 2 layers. For your instance, there likely won’t be much sound escaping ‘sideways’ so best focus on where the issue actually resides. Link to comment Share on other sites More sharing options...
bob the builder 2 Posted October 1, 2022 Author Share Posted October 1, 2022 Many thanks could i ask Which rockwool product should i buy for maximum acoustic insulation for internal stud walls and posi joist ceilings ? Where did you get your kill Matt from ? Many thanks Bob Link to comment Share on other sites More sharing options...
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