Overlaying wooden floors

[Barry bp]

m8
1 do you add noggins?
2 do you prime the under side and edges of the ply?
3 do your tiles span the joints in the ply?
4 do you acclimatise the ply prior to fixing the tiles?

1 yes
2 no
3 yes
4 yes
do i need to always overlay from now on?

 

[The D]

it is up to you m8 but personally i do not tile directly on to ply. with all the products that are available my question is why do you want to.

PS i am surprised that you do not prime but you do acclimatise the ply.

 

[Barry bp]

it just seems a little over the top on an average bathroom floor with a new 18mm well fixed ply floor with little bounce using s2 class adhesive to overlay again

 

[The D]

BS 5385
The use of sheets and boards that are subject to movement from changes in moisture content, e.g. wood-based materials such as plywood, chipboard, wood particle boards, etc. should be avoided if at all possible. If such boards have to be used they should be restricted to small areas and tiles should not bridge joints between boards. It is good practice to seal all exposed edges and the backs, but not the faces, of such boards with a suitable sealer to prevent distortion by atmospheric humidity changes. Care should be taken to ensure such boards are not installed in a condition where their moisture content is higher than the ambient equilibrium moisture content once the tiled installation is in use. Failure to observe this can lead to subsequent warping and distortion of the boards with consequent cracking and delamination of the tiling.

 

[Barry bp]

i never normaly use ply on walls but i used flexy ply for this glass mosaic fixed with opf rocksolid

 

[The D]

if the floor has no bounce you can use an uncoupling membrane instead of over board.

 

[EFC Mike]

Quality Deano!

 

[Barry bp]

BS 5385
The use of sheets and boards that are subject to movement from changes in moisture content, e.g. wood-based materials such as plywood, chipboard, wood particle boards, etc. should be avoided if at all possible. If such boards have to be used they should be restricted to small areas and tiles should not bridge joints between boards. It is good practice to seal all exposed edges and the backs, but not the faces, of such boards with a suitable sealer to prevent distortion by atmospheric humidity changes. Care should be taken to ensure such boards are not installed in a condition where their moisture content is higher than the ambient equilibrium moisture content once the tiled installation is in use. Failure to observe this can lead to subsequent warping and distortion of the boards with consequent cracking and delamination of the tiling.

thanks for claryfing that to me is the quot from the tile fed

 

[Barry bp]

what could i use instead of ply straight onto joists

 

[The D]

the quote is from the British standards 5385