dura mat

[Unregistered]

put dura mat down on new green style chipboard flooring with flexible adhesive then tiled cermic tiles using flexible grout is crackingflexible adhesive after 2 days

 

[Gazzer]

We would need more info. What adhesive, Is the floor solid , What grout did you use ?

 

[kilty55]

hello,do you mean durabase ci matting?

personally i would have overboarded the chipboard with cement boards if the sub floor was solid then tiled direct

did you check the sub floor?
what exactly is cracking also,ta

 

[macleantiling]

hi the floor seemed solid i put yellow dura mat down with bal flexible adhesive then tiles with same then grey bal fleible floor grout some grout now is crumbling and coming loose hope i explained properly

 

[Gazzer]

Are the tiles loose ?

 

[macleantiling]

strangely enough no

 

[Gazzer]

So it would be best to assume the grout was the problem ? out of date? mixed incorrectly ?

 

[doug boardley]

did you have noggins (dwangs) aplenty between the joists?

 

[Alan.P]

In what areas and how much grout is cracking ?

 

[DHTiling]

Is it a floating floor ?

 

[jay]

The reason why we overlay with cement sheet

 

[doug boardley]

it really does sound like a deflection (vertical bounce) issue imo, as Dave asked, is it a floating (ie not securely fixed to sub-floor) floor?

 

[Yorkshire Tiling Services]

I really do not know why anyone would want to put a crack isolation membrane on a floor like this.Serves no purpose, would be better beefing floor up with cement board,cemented and screwed down. Crack isolation membranes will not compensate for deflection.