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goz

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Anyone Tiled on this stuff? Dry screed essentially, gypsum fibre board, it’s laid over wet underfloor heating which is laid in a board itself , that in turn is on chipboard floor, it’s 1st floor. The boards are glued together but are not fixed down so is a floating floor...... I don’t tile floating floors but Knauf are insisting it’s ready to tile without ditra ......?! Thoughts??
 
F

Flintstone

How thick are they and what are they suggesting you stick your tiles down with ?
 
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goz

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22mm thick boards, interlocked and glued. I want to put ditra down but Knauf are saying it’s not needed. Single part flex I believe .....
 
B

Bill

Personally, I would glue and screw the gypsum boards to the chipboard floor (I have done so with plywood floors and had no problems) then I would prime the gypsum boards and use a quality s2 https://www.tilersforums.com/forums/tile-adhesive/.

You could use a gypsum based tile https://www.tilersforums.com/forums/tile-adhesive/ but that may incur quite a higher cost.

If your tiles are anything but natural stone then you don't need a decoupler although it will not do it any harm if you do.

The gypsum boards are not foil faced, are they?
 
F

Flintstone

I’m struggling to see how tile to gypsum board with cement https://www.tilersforums.com/forums/tile-adhesive/ is a good idea?
 
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goz

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The builder is not screwing these boards down, they are laid on top of the ufh system and glued together, Knauf specify this apparently, a heavy floating floor!!!
 

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