Knauf Brio board????

[goz]

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??

 

[Flintstone]

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

 

[goz]

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 .....

 

[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 adhesive.

You could use a gypsum based 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?

 

[goz]

Sorry guys it Knauf GIFA board not brio
Knauf GIFAfloor - Knauf - http://www.knauf.co.uk/product-range-overview/flooring/knauf-gifafloor

 

[Flintstone]

I’m struggling to see how tiling to gypsum board with cement adhesive is a good idea?

 

[Bill]

I’m struggling to see how tiling to gypsum board with cement adhesive is a good idea?

I have done it a few times just primed the boards.

 

[goz]

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!!!