Hairline craks in SLC

[vrytir]

Did it crack before or after you walked on it and are the cracks in straight lines or squiggly ?

I think it cracked when I walked on it, but I am not 100% sure.
Cracks are squiggly.

 

[vrytir]

and the pictures

 

[big george]

are the cracks starting from the same point on the floor? could be a weakness at that point

 

[Ajax123]

and the pictures
View attachment 51194 View attachment 51195 View attachment 51196

Those are most definitely drying shrinkage cracks. Possibly the substrate has sucked the moisture out too quick, possibly it has evaporated too quick. You can repair them with a low viscosity epoxy resin but don't other until after you have run the underfloor heating through its heating cycle.

 

[DHTiling]

If it is hollow to tap , then it is goosed..

 

[White Room]

As above, sounds like it's blown considering it cracked when you walked on it....

 

[enduro]

Got cracks in my hairline..:yikes:

 

[Ajax123]

Got cracks in my hairline..:yikes:

Think yourself lucky.... I haven't even got hair in my hairline anymore

 

[Mark S]

Looks like a combination of shrinkage cracks and movement in the boards, as with Dave, does it sound hollow when tapped?, coz thats a whole new ball game.

 

[vrytir]

, does it sound hollow when tapped?,

No, it doesnt sound hollow when tapped.

 

[vrytir]

Should I tile on it?

 

[DHTiling]

In all honesty .. NO..

 

[vrytir]

So should I take it apart and start again:yikes: I plan to use mapei ultraflex adhesive, which is super flexible, wouldn't this help?

 

[vrytir]

Or could I put another layer of SLC? Would this help?
I also find that current layer of SLC is kind of "AERO chocolate" bubbly, I guest this is problem.:mad2:
Would another layer of SLC sort both problems (bubbles and cracks)? And then use Mapei Ultraflex adhesive.

 

[DHTiling]

You not tiled it yet then