Newly laid porcelain floor tiles over UFH, showing lines,

[Ian gall]

My guess is that the SLC didn't lose it's required moisture content prior to tiling, and everybody just carried own piling down more stuff and trapping more moisture...
Put a carpet over it,

Really? Most self levelling screed is ok to cover in 24 hours or less. This was screened one morning and tiling did not start till following day and took a further 4 days to complete yet lines are on all tiles pretty much, certainly all full size tilesz
.

 

[Shaun]

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, that looks to me like adhesive bleed through the tile. If you look closely enough you can see the lines correspond to the trowel that was used to lay the adhesive. This is due to a couple of reasons.. 1) Grey adhesive used instead of white. 2) No back buttering of the tile prior to laying it onto the adhesive ridges. 3) The adhesive ridges have not been collapsed and that's the lines you can clearly see.

Sadly, this is something you are probably going to have to live with if you don't wish to relay the floor correcrly.

 

[Huddersfield Tiling]

Really? Most self levelling screed is ok to cover in 24 hours or less. This was screened one morning and tiling did not start till following day and took a further 4 days to complete yet lines are on all tiles pretty much, certainly all full size tilesz
.

Yeah, you're probably right, dependant on temp. Are they fully vitrified porcelain tiles?

I've changed my mind to the incorrect installation of the UFH wires and/or waiting times before it was turned on.

It could be excessive heat due to the UFH installer ordering too much mat and overlaying (not allowable) or a rapid heating of the mat/cable which has caused a premature curing of the background.

How much faith do you hold with the tiler you employed?

 

[Ian gall]

Yeah, you're probably right, dependant on temp. Are they fully vitrified porcelain tiles?

I've changed my mind to the incorrect installation of the UFH wires and/or waiting times before it was turned on.

It could be excessive heat due to the UFH installer ordering too much mat and overlaying (not allowable) or a rapid heating of the mat/cable which has caused a premature curing of the background.

How much faith do you hold with the tiler you employed?

Hi
saw the mats down and no overlapping..once UFH turned on was only set at a ro9m temp of 20 degrees, floor temp never much above 14 deg,

he was meticulous with each tile is all I can say , as not had this work done before.
not sure if vitrified as just described as porcelain, was not aware of the term vitrified until recently .

 

[Ian gall]

Hi
saw the mats down and no overlapping..once UFH turned on was only set at a ro9m temp of 20 degrees, floor temp never much above 14 deg,

he was meticulous with each tile is all I can say , as not had this work done before.
not sure if vitrified as just described as porcelain, was not aware of the term vitrified until recently .

They are not cowboys for sure , do a lot of bathrooms especially, and seemed to know what they were doing.

bit of a nightmare as not sure whether to give it some time fade, they are checking with their adhesive suppler as never had this before.

 

[Dave]

They are not cowboys for sure , do a lot of bathrooms especially, and seemed to know what they were doing.

bit of a nightmare as not sure whether to give it some time fade, they are checking with their adhesive suppler as never had this before.

I would run the UFH for a few weeks and see if it improves. Fingers crossed it might.

 

[Ian gall]

Hi
saw the mats down and no overlapping..once UFH turned on was only set at a ro9m temp of 20 degrees, floor temp never much above 14 deg,

he was meticulous with each tile is all I can say , as not had this work done before.
not sure if vitrified as just described as porcelain, was not aware of the term vitrified until recently .

They are described as glazed porcelain..

 

[Ian gall]

I would run the UFH for a few weeks and see if it improves. Fingers crossed it might.

thanks, have agreed with tilers that as tiles were laid couple of weeks before heating was hooked up, that would leave till end of March and in meantime they are seeking sone advice from the adhesive suppliers who will probably say the same.

thanks For you input , appreciated.

 

[Huddersfield Tiling]

Hi
saw the mats down and no overlapping..once UFH turned on was only set at a ro9m temp of 20 degrees, floor temp never much above 14 deg,

he was meticulous with each tile is all I can say , as not had this work done before.
not sure if vitrified as just described as porcelain, was not aware of the term vitrified until recently .

Vitrified means that the tile isn't porous to any problematic level of moisture. Porcelain is a material designed for very low porosity, hence it's outdoor use in cold climates and hard wearing properties.

 

[Dave]

thanks, have agreed with tilers that as tiles were laid couple of weeks before heating was hooked up, that would leave till end of March and in meantime they are seeking sone advice from the adhesive suppliers who will probably say the same.

thanks For you input , appreciated.

Keep us updated on results 👍

 

[Ian gall]

Keep us updated on results 👍

Will do and thanks