Loose tiles & underfloor heating...

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Also, never been used but the thermostat (Warmup 4IE) offers geo tracking which will switch your floors off if you leave the house, and back on when you return home? Surely that would invalidate your gradual warmup routine?

I pretty sure the warmup4IE will switch it to a lower temp, say 12c or whatever you decide rather the off.
why would you want to turn it right off, not an efficient way to run ufh.
 
You need to get the builders back first of all, how did they lay over the cables........Dot/dab??

You will also find it difficult to get another tiler to rectify the problem, as most of us do not like repairing other people’s work........especially not know it all/jack of all trades (master of none) builders.
 
Sorry, let's start again none of them have ever been powered down. I just mean the temperature has been at its fallback temperature of 16 degrees (?). Floor always reads around 18 during this time presumably due to the central heating in the house. When I say on, I mean set to usually 22, sometimes 24 to give a to touch feel underneath.
 
OK fallback is 12 degrees

20190217_191620.jpg
 
Have you tried tapping the tiles to see if they sound hollow? The builders might have dot and dabbed them and created hollow spots
 
This is what it says on the bag , so by going to sealocrete all they will do is throw it back on the builder who did the job.
Sealocrete Rapid Set Flexible Floor & Wall Tile Adhesive is a cement-based adhesive for use on concrete, concrete block, cement render and brick. It can also be used on plaster, plasterboard, chipboard, wood and existing glazed ceramic or vinyl tiles and is suitable for use with most domestic underfloor heating kits. For internal and external use.
I know you don't want to get the builder back, but why pay out you hard earned cash to put something right that should been done right on the first time of asking.
If they refuse to make good mistakes seriously think about taking legal advice on the matter.
 
Thanks all. I called the builder this morning, he's said he'll come and take a look.
He said the only time he'd seen it before was when moisture got into the chipboard...

Thinking about it, my mother in law showered with the shower door open (as you do) about a month ago in the room adjacent. At the time we ended up with water stains on the ceiling below. The tiles next to the flooded shower are fine, but it is the other side of the wall that they are all lifting so may be related? 🙁

Although that doesn't explain the ones in the kitchen ...
 
evo-stik recommends priming with PVA

Underfloor Heating: 8. If using over underfloor heating elements, apply the adhesive according to the manufacturer’s instructions, leaving the correct length of time between laying the underfloor heating and applying the adhesive. Heating systems must be switched off for at least 48 hours before and after tiling.

9. Dusty or very porous surfaces should be primed with 1 part EVO-STIK Evo-Bond PVA to 4 parts water by volume and allow to dry prior to tiling. For wooden floors only prime if absolutelynecessary as it may reduce the porosity of the floor and increase the drying time of the adhesive.
 

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