Is MDF OK for Tiling over?????

[manwithmission]

Hi

I'm going to Tile our Bathroom. The existing floor is T&G & I've boarded half of it out with 18mm Ply (on Top of the T&G), so it's really solid.

Question is, I've run out of Ply, but have a sheet of 18mm MDF. Will I be OK to use that?

Can the Tiles tell the difference?


Thanks!

 

[jefoss]

best go with the ply fella, if its one sheet its not expensive, use the mdf for fire wood

 

[manwithmission]

best go with the ply fella, if its one sheet its not expensive, use the mdf for fire wood

Thanks Jef

It wasn't so much the expense, I just have 2 8x4 sheets of 18mm MDF here & thought I'd get rid.

You obviously don't advise it.

 

[big-all]

mdf is very thick cardboard that will swell up when wet and loose its integral strength

 

[manwithmission]

mdf is very thick cardboard that will swell up when wet and loose its integral strength

Thanks All

I'll do it in ply then.

ta

 

[Richard C]

I'll do it in ply then.

ta

Make sure that's WBP ply.

 

[manwithmission]

I'll do it in ply then.

ta

Make sure that's WBP ply.

Eeek, I'm hoping what I've already put down is WBP, it's nailed every 5 inches.

How do I tell?

 

[Richard C]

Eeek, I'm hoping what I've already put down is WBP,
How do I tell?

It really has to be WBP (water & boil proof) or marine ply (even more expensive) as the glue used for ordinary ply is not waterproof. I don’t know how else you can tell except by the price, anyone else know?

it's nailed every 5 inches.

Make those screws instead.

 

[manwithmission]

Thanks Richard

I will add Screws.

Am I supposed to Seal the Ply before Tiling? I'm thinking I should make double sure it is sealed properly just in case the stuff I've already put down isn't WBP.