Newly laid porcelain floor tiles over UFH, showing lines,

[Ian gall]

new porcelain floor tiles laid 4 weeks ago over new electric heating matts. Heating only connected a week ago and dark lines showing on most tiles?

possible causes? Any help/ guidance appreciated. Laid by tiler not DIY.

 

[Dave]

new porcelain floor tiles laid 4 weeks ago over new electric heating matts. Heating only connected a week ago and dark lines showing on most tiles?

possible causes? Any help/ guidance appreciated. Laid by tiler not DIY.
View attachment 114140

Hi. Did he use grey adhesive?

 

[demi34]

They are 2 things you have to know, did the tiler cover the underfloor heating with self levelling and he gone for grey adhesive and dot and dab.

 

[Ian gall]

Hi. Did he use grey adhesive?

Yes

 

[Ian gall]

Yes

and that would show through an 8mm porcelain tile?

 

[Ian gall]

They are 2 things you have to know, did the tiler cover the underfloor heating with self levelling and he gone for grey adhesive and dot and dab.

Hi
heating matts covered in self levelling screed and watch him and full coverage not dot and dab.Adhesive was grey though , tiles are 8mm porcelain

 

[demi34]

Might be the quality of the tiles

 

[Dave]

and that would show through an 8mm porcelain tile?

It has been known yes , hence why a solid bed is best achieved.. on light tiles no matter the biscuit ( body ) , i use white adhesive.

 

[Ian gall]

Might be the quality of the tiles

thanks for responses.....don’t know how I would prove tiles were at fault?

So grey adhesive ok to have been used as long as not dot and dab?

tiles laid some 4 weeks ago and heating only hooked up a week ago.

could marks go away? or will i have to live with them, as don’t fancy floor coming back up in a large 33sq meter Kitchen area.

trying to be sure in first instance it’s not likely to be a fitting issue.

 

[Ian gall]

It has been known yes , hence why a solid bed is best achieved.. on light tiles no matter the biscuit ( body ) , i use white adhesive.

Thnx. Are lines likely to be permanent? Tiles laid 4 weeks ago UFH only hooked up a week or so ago.