Waterproofing proposal - Please validate.

[Homel]

Hi all - another newbie here. I’m in the process of changing an en-suite bath room to a wet-room.

I’ve spent hours reviewing the forum and found the information and advice invaluable. From this I have formed a plan of action but would like to ensure that my planned approach is appropriate.

Floor

• I have pulled up half the existing 18mm chipboard to reroute plumbing so planning to replace all with 18mm WBP plywood. Joists at 400mm. Will add extra noggins as required and screw at 300mm centres.
• Cover with 6mm Marmox insulating/tile backer board (screwed at 150mm centres) – do I need to use adhesive too?
• Preformed corners and sealing tape at all joints
• Marmox showerlay tray.
• Underfloor heating mat.
• SLC (except on shower tray of course)
• Durabase CI+ decoupling membrane (with appropriate adhesive)
• Tiles (probably a 8-10mm marble with marble mosaics on shower tray),

Walls

• 3 stud walls with skimmed plaster board, 1 external wall with skimmed plasterboard.
• Cover with Dura-WP (with appropriate adhesive)
• Tile. Tiles are the small metro style tile which I believe will come in around 20kg per sq.m incl. adhesive.

Sloping ceiling from eaves (about 45/50 degree slope) – forms part of shower area so need to tile it.

• Replace existing artexed (yuk!) plasterboard with Marmox 10mm tile backer board.
• Planning to tile (same tiles as walls) directly to this as will only be subject to splashes and not steady flow/immersion (Showerhead in ceiling). Or should I Dura-WP as well?

Does this make sense? Have I missed something or have I gone over the top?

Thanks in advance.

Lee

 

[Homel]

Waterproofing Proposal

Hi All

A photo of the proposed wet room attached (hopefully:smilewinkgrin. Any comments on my proposed approach would be much appreciated.

Thanks. Lee

 

[White Room]

Yes you do need to use adhesive to the marmox on the floor but a 10mm for the ufh maybe better.

If your replacing the pitched ceiling plasterboard your 10mm marmox would need your timber to be at 300mm centres, if there at 400mm a 12.5mm would be required.

 

[Dave H]

I would use 10mm marmox on floor, you can take ufh into shower area, but do boarding and tanking first, cover with flexible tile adhesive in shower area as slc not good on falls. Re :- mosaics to shower, check with Marmox, but think smallest mosaic you can use is 50mm2. As Whitebeam says 12.5mm Marmox would be better if 400mm centres., and make sure you use fixing washers!

 

[Homel]

Thanks for the responses - much appreciated. I will modify the approach accordingly. Lee

 

[little ed]

Hi, im contantly reading threads on here, and im sorry if im hijacking this thread but what does it mean when you mention a measurment and centres. I.e 400mm centres.

Im looking at doing my own wetroom in the near future ive picked most things up but not this.

Thanks and great forum!
ed

 

[Gazzer]

its the measurement between the screws etc.....ie 200mm 400mm between the centres of screws etc

 

[little ed]

Ahh brilliant thanks for that i was getting a bit too technical with myself thinking it was something to do with joist etc.

Thanks for cleaqring that up.
I will update with my own post on my wet room once it starts

Ed

 

[Gazzer]

It can be between anything...basically its the distance between 2 items from the centre of the item itself. screws, pipes joists etc