Cold area in UFH

rossifumi_2

Hi,

I've recently had electric underfloor heating installed in my bathroom, but have found a problem with a cold area on the floor (roughly .25 m2). The firm that installed it say it's not a fault with the product (which I think is devimat), but is down to the way the mat had to be cut to fit the floor shape. They reckon the fitting can result in cold areas and is just the way it is (i.e. they're not coming back to resolve the problem).

Does this sound reasonable? Or could I have a case for taking this further?

Any advice appreciated.
RF

Andy_WSM

Yes, unfortunately, using mats it is inevitable that you will get some cool spots. The way to overcome it is to run the floor at a lower temperature for longer so the tiles heat through.

rossifumi_2

Hi Andy,

Thanks for you response. I tried your advice out to lower the temp & run it longer, but it hasn't improved things. I think the cold area is just too big - around 0.5m x 0.5m, to be heated by the heated floor area around it.

Thanks,
RF

Andy_WSM

Hi RF, Yes, 0.5m * 0.5m does sound too big to be heated by the surrounding mats. When I laid my mats I was very careful to make sure that there was at least one, if not 2 heating wires under each and every tile. - This was achieved by cutting the tape on the mats when laying them on the floor.

I don't know how you would take this further, but it doesn't sound to me like they have done a particularly good job - especially as you can buy the mats in all manner of sizes to fit the job at hand. I have done 3 rooms in my house now and none have "cold" spots, although there are "cooler" spots until the floor has warmed through evenly.

rossifumi_2

Thanks, I'm going to get a couple of other fitters in to inspect the flooring and provide a price for rectifying the cold area (if possible), then look to claim the costs back from the original installers.

Appreciate your help.