straight onto 18mm ply ? - TilersForums.com

[redlee]

Job i'm on at the minute has polypipe between joist heating with an 18 mm wbp ply top screwed to joists, the floor is firm. Would you tile on this as is, cover with cement board and tile, cement board and uncouple and tile or laminate?

 

[redlee]

Meant to say the ply isnt overboarding anything just straight to joists.

 

[lukeb]

As you suggested-use backer board over ply+uncoupling membrane then tile it.Make sure no deflection before installation.:disguise:

 

[doug boardley]

as above ^^^ for me.