Floor advice please - ply or marine?

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D

Deleted member 51575

Hi, I have newly built shell of an extension and we are just starting first fix plumbing. The floor joists are in place but my builder and plumber seem to have a difference of opinion on the flooring for the bathroom.

The builder says the green coated 18mm ply is sufficient, whilst the plumber insists on marine ply. The joists are all brand new and have noggins. We anticipate tiling the floors. (50x250mm timber joists @ 400mm
centers).

Would just 18mm ply be ok or am I better to spend the extra for the marine ply. Plumber suggests the maring ply should be glued and then screwed every 100mm.

Is just one layer of 18mm sufficient on top of floor joists?

thanks in anticipation..
 
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W

Waluigi

Two options- Ply wood and overboard with a tile backer board.

Or, a thick cement board directly on to the joists.

A lot depends on what exactly you’re fitting on the bathroom floor in terms of tile type and whether there’s UFH (wet or dry) or not.

On a Personal level I’ve never used the thick cement board. It’s an idea that gets suggested a lot but very rarely done. For a reason I don’t yet know.
 
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H

hmtiling

Waluigi said:
Two options- Ply wood and overboard with a tile backer board.

Or, a thick cement board directly on to the joists.

A lot depends on what exactly you’re fitting on the bathroom floor in terms of tile type and whether there’s UFH (wet or dry) or not.

On a Personal level I’ve never used the thick cement board. It’s an idea that gets suggested a lot but very rarely done. For a reason I don’t yet know.
Click to expand...
Price and availability
 
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W

Waluigi

SharonB said:
One bathroom will have electric UFH, and the other one wont have any UFH. Does that change your suggestions?
Click to expand...

Yes it does.

One overboard with a thin cement board, the other with UFH is overboard with an insulation board. Both, glued screwed, taped and filled.

If you went for the thick cement board on to the joists then the UFH room might still need overboarding if you want the most efficiency as the cement board acts as a heat sink somewhat.

That said, I have laid UFH on cement boards before and they actually work reasonably well.
 
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