Hello all, new to forum, need advice with wetroom floor.

[IanB]

Hello everyone, have often looked at this forum for advice and have just registerd this morning with a question.
I am looking at changing a bedroom into a wetroom in an old house and planning to overlay the existing floor with Marmox boards.
The existing floor is approx 3.5 x 2.5 square metres of wooden floorboards which will all be screwed down tight. I plan to overlay with 10mm Marmox boards ( glued and screwed!), I wondered whether I should overlay the existing boards with ply first or will it be ok without?

Cheers,

Ian.

 

[EverDon Tiling]

If it was me i would overlay with ply first better to be safe.

 

[Dontiler]

Hello and welcome!
Your floor should be rigid and no deflection, if there is any deflection I would definitely be tempted to check what is going on under the floor boards, in that case extra noggins will be required, would use WBP 18/22/25 mm ply over joists, and overlay with 6 mm hardibacker glued and screwed 300 centres, if your floorboards well fixed and secured, then you could glue on flexi ady 6 mm. hardibacker straight on to floor boards, but it's not ideal
good luck

 

[Rich]

If the floor boards are in good shape and you can get them totally deflection free then there shouldn't be any need to lay ply over the boards. If you wanted to go belts and braces, I would remove the floor boards, add some noggins to the joists. Then lay 18mm WBP ply over this and fix down at 200mm centers (the ply boards will need to be staggered and a 2-3mm gap left between each board) then over board with the Marmox.

This should give you a really good sound floor to tile onto

 

[Rich]

Hello and welcome!
Your floor should be rigid and no deflection, if there is any deflection I would definitely be tempted to check what is going on under the floor boards, in that case extra noggins will be required, would use WBP 18/22/25 mm ply over joists, and overlay with 6 mm hardibacker glued and screwed 300 centres, if your floorboards well fixed and secured, then you could glue on flexi ady 6 mm. hardibacker straight on to floor boards, but it's not ideal
good luck

Beat me to the punch!

Great minds hey?

 

[Dontiler]

xexe indeed 🙂

 

[White Room]

Hi and welcome..

 

[Diamond Pool Finishers]

:welcome:

 

[Ian]

Welcome along

 

[DHTiling]

Hi and welcome..

I would prefer the Marmox boards.. hardibacker isn't waterproof.. So not much cop for a wetroom unless you tank the hardibacker as well.. which is costly..

As above make sure the floor boards are fixed well and overlay with Marmox... but firstly you will need to sort the drainage etc before doing that.. plan well and tile once..

 

[suave]

welcome!

 

[IanB]

Thanks for the advice everyone. The floor boards are fairly old but in good condition and haven`t been disturbed much, the shower drain will go straight out between the joists so that shoudn`t cause a problem. Will check it thoroughly first bfore starting any work.

Cheers,

Ian.

 

[steve187]

Hi and welcome, a difficult first job.

 

[Rich]

Be sure to come on here and get advice at each stage of the project, there are lots of things that could go wrong on a job like this so it is very important to get everything right

 

[jay]

:welcome:

 

[The Legend; Phil Hobson RIP]

:welcome:

 

[Gall.B]

Welcome Ian good advice above I tend to go for Wedi board in a wetroom.

 

[IanB]

Thanks for all the advice. Original thoughts were for ceramic or porcelain type floor tiles, thoughts are now turning to a travertine/stone tile with electric ufh! Would Marmox/wedi boards be adequate on top of the existing floorboards ( or plywood), or should I look at using a decoupling mat?