Floor Tiling onto Timber Floor - TilersForums.com

[gbh]

Hi,

I have just joined the forum and would like some advice/opinions please.

I am currently renovating an 1935 house and have stripped out the bathroom. The existing floor in the bathroom is tongued and grooved pine floor boards nailed down onto timber joists.

The floor boards in general are in reasonable condition, but I am going to remove all the T&G boards and replace with 18mm plywood. I do not want to overboard the T&G as it will leave a step up into the bathroom.

I have been advised to use marine plywood as a replacement to the T&G boards and screwed down to the joists, but it is very expensive. I am thinking about using external spruce plywood at 18mm thick, and sealing the surface with PVA and then laying the tiles and adhesive on this.

Will this be acceptable? Would like to hear some opinions please?

Thanks.

Gary

 

[Chalker]

Marine ply isn't much more cost, when you look at the job as a whole. It's a much better product, the layers are bonded with more pressure and exterior glue.

no PVA ! Use acrylic primer.

 

[Andy Allen]

When floor boards are up add more noggins to strengthen the floor and I would overboard the ply with cement boards.....perfect tiling surface..

 

[Stef]

As Andy states above, I would overboard that ply with a 6mm cement (Hardi) board.
I would get as many Dwangs, noggins, into the floor as I could also.

 

[Chalker]

As Andy states above, I would overboard that ply with a 6mm cement (Hardi) board.
I would get as many Dwangs, noggins, into the floor as I could also.

Dwangs!? Too many sambucas mate!

 

[mma]

Dwangs!? Too many sambucas mate!

It's what them up there call noggins.

 

[One Day]

Sounds like OP would make an excellent professional builder or plumber!

 

[Stef]

Dwangs!? Too many sambucas mate!

That's the last time I take you out for a Dram m8!!!
Jagerbombs Paul...

 

[Chalker]

That's the last time I take you out for a Dram m8!!!
Jagerbombs Paul... 

im an amateur compared to you Stef!

 

[Stef]

You know what us "up here" are like.
Never met a Scotsman that canny drink..

 

[smoothound]

just wondering why remove the original boards unless they are in bad nick? - they may be less than 18mm - just lift em - add extra noggins and check the joists are well bedded - screw the floor boards back down tight - fit the cement boards (hardi) using a thinish layer of flexible adhesive to fill gaps from board cupping etc - (some say non-flexible is OK but I prefer felxible under the hardiboards) - and use the proper anti-corrode screws - and go from there