Help!: 18mm marine ply

[uibaggio]

hiya all im new here....

im taking up all my floor boards in the kitchen area and installing under floor heating, then i will be tiling with 12mm Slate Tiles, can i just screw down 18mm marine ply on the joice or do i need to put back the floor boards and then the marine ply on top..

thanks Baggio

[faithhealer]

Are the joists ok, might be worth putting a few noggins in so you can get a few more screws in. Or is 25 mm an option.

[keraldine]

you could always forget the ply and use a load bearing tile backer board such as hardibacker the websites should be able to guide you and CTD can sell it ,

[Dave]

you could always forget the ply and use a load bearing tile backer board such as hardibacker the websites should be able to guide you and CTD can sell it ,

Not really suitable for overlaying straight onto joists though keraldine....

[keraldine]

Sorry missed a bit i was thinking it would save pulling up floor boards