undertile heating not working properly

[GREN2908]

Hi guys, I wish i had seen this forum ages ago. I have had UTH, thermomat 150w 2m sq from B&Q with non-programmable thermostat installed. It was in bathroom directly onto concrete floor - while i was at work the wife didnt notice they did not put down insulation boards.

After 2 and a half hours the floor has had the chill taken off it but does not get any warmer. On turning down the thermostat, the light goes to green at about 4 (out of 10) but immediately red if i increase it. I have left it on for 24 hours but it does not get any warmer.

Im not happy as the kids really need a proper warm floor for the winter. Can anyone please suggest what i should check, is it more likely to be faulty thermostat - I wont be impressed if all the floor has to come up.

The firm who laid it keep giving excuses not to come back up to look at it.

Cheers
Gren

 

[DHTiling]

This thing is with no insulation boards etc..is that you have to heat the full concrete slab before you get any heat transferring back to the tiles and it will not get as warm if you are losing heat into the substrate.......This mats don't transfer heat instantly like a radiator they have to warm up....but without insulation it will take longer than 24hrs sometimes.......

 

[CJ]

As above...........

The heat is is being cooled by the concrete slab before it gets up to the tiles.

Get them back

 

[Gazzer]

Also taken from Warmups website
They would recommend 200w and not 150w
"200 W/m² Heating Mats
These heating mats will heat up more quickly than the 150w mats and are suitable in rooms with a high heat loss such as extensions and conservatories or in rooms where the sub-floor insulation might not meet the latest building regulations."

So basically, had the insulation mats been fitted then 150 may have been fine. As it is i think you will find that you will need to build the heat over at least 24 hours and you will probably have to keep it on full.

 

[poynton phil]

i agree with dave, without insulation it'll take forever to heat up. also i wouldn't buy thing like that from B&Q as its my opinion they only sell crap:furious3:spent more time taking stuff back there, than anything else.

 

[Northern Bird]

Have you got an oprginal qupte. Does it highlight any of the insulation boards i.e. Wedi, Marmox, Aquapanel (many more brands available.)

I agree get them back

 

[eyebeetiling]

Hi
As Northern Bird says, check the quote, if it states that they should have layed insulation and they haven't then they have no legs to stand on.
If the excuses keep coming go the C.A.B. and see what legal route you would have to take.

Good luck

 

[GREN2908]

Thanks for your help guys, took ages insisting on the phone they come out and fix it, told them to look here and they caved in straight away, they are coming back tomorrow.:hurray:

Cheers
Gren

 

[DHTiling]

pleased you got them to come out Gren.. let us know the outcome.....

 

[Gazzer]

Thanks for your help guys, took ages insisting on the phone they come out and fix it, told them to look here and they caved in straight away, they are coming back tomorrow.:hurray:

Cheers
Gren

HA HA the power of the forums :lol: