Failure!

[White Room]

Is the boiler a pressure system...

 

[STEvieXE]

It's a pressurised system yes but gets topped up regularly!

 

[Andy Allen]

The adhesive is dry to the touch. Would this be why there appears to be different COlours of addy, its the same with wet patches?

Could well be.....plus years ago there were some real naff floor adhesive out there that would just disintegrate if they got continually wet.

 

[White Room]

It's a pressurised system yes but gets topped up regularly!

I have the same system and hardly gets any topping up.

 

[LM]

Yeah years ago there was a lot of cr*p adhesive sold over here like Durabond etc that most DIY stores that sold tiles like that would have pushed. That added to practically no grout gap in the tiling has probably contributed heavily to the failure.

 

[Time's Ran Out]

Once the grout goes it won't take may wet washes to get too much water under the tiles.

 

[LM]

There's also hardly any adhesive transfer to the back of the tile which suggests that the adhesive may have been made stiff to aid getting the job done in one day and would have also then caused the adhesive to be weaker.

 

[STEvieXE]

Is there any *easy way to tell
If I have a leak below the subfloor?

What should my next move be?

 

[Saltire69]

As to the 2 different colours off adhesive, it could have be tiled before and they never scraped old adhesive off.

 

[LM]

Is there any *easy way to tell
If I have a leak below the subfloor?

What should my next move be?

They obvious way is to leave the uplifted floor uncovered for a few days and see if it dries out, if it continues to look damp then you have your answer, at which point you should contact your home insurance or alternatively if you like I can give you details of a local company that will come out and exactly pinpoint your leak, but they aren't cheap to pay although it wouldn't be dramatic.