UFH Heat problem with marble floor

[sawyer]

Ive recently put in a warm up underfloor heating system and marbel tiled floor in my bathroom everything is working fine but the tiles dont hold any heat just let it in to the room is there anything i can do to reduce the heat loss. I havent yet sealed them will this make any difference thanks

 

[DHTiling]

What substrate is it on to.?

 

[Ian]

Have you used insulation boards under the heat matt? Also what is the area or the floor and wattage of the matt? Oh, and the thickness of the marble?

 

[sawyer]

the tiles are about 8mm thick are on 10mm warm up insulation boards its 2x 800 loose wire kits i know its working as if there is a bath mat on the floor the tiles get really warm as i guess the mat is trapping the heat other wise it just heats the room. When i bought the kit/tiles i asked if they where suitable

 

[Stewart]

For it to heat the room, the tiles must be getting warm. What temp are you setting it at, is the thermostat set for room temp or floor temp......?


Created on iPhone.....

 

[sawyer]

i set it to 40 degrees got up to 36 after about 2hours not sure about which it was set for didnt know it could do both

 

[Stewart]

Check your manual and set it for floor temp only and take it from there.....


Created on iPhone.....

 

[PHG Dave]

Due to the relatively thin 8mm tiles the floor has very little thermal mass to enable it to absorb the heat from the UFH and then slowly release it.
You don't mention the wattage per square metre that your setting is giving you but it sounds like it is too low if the tiles are dissipating the heat quicker than you can put it in.
Are you sure both kits are working?

 

[sawyer]

I'm not sure of the wattage is there away of adjusting it yes both kits are working I basically told the chap in tops tiles what I wanted how big the room is ect and this is what he recommend but at the minute all I'm found is heating the room via the UFH

 

[PHG Dave]

the only way of adjusting the wattage/sqm is at the installation stage by increasing or decreasing the gap between the wire run (obviously only possible on the loose wire systems)

 

[Discount Tile Supplies]

Go back in to Topps and ask them to come and have a look and ask them to get warmup out to look and say whats wrong. Did you buy the tiles from them? Who fitted the UFH and the tiles? You possibly need a electrician to answer your problem surely not a tiller?

 

[Uheat - Keith]

To check what your wattage is, per square metre, you will need to find out a few things.
a) What is the wattage per metre? b) What is the length of the loose cable? c) What is the total wattage per each length of cable? d) What is the free floor area in square metres, that the loose wire was installed onto?
"a) x b) = c)" "d) :- b) = w/m2.
For installing onto an insulation board, a 10w/m loose cable, for installing under tiles etc, should has a spacing between 50mm and 70mm. Not forgetting you have two cables.
This should then give you an approximate watts per metre square of between 125w/m2 to 175w/m2.

 

[sawyer]

Been on to warm up today and they have said it sounds like I dm getting heat loss from some where ie a draft. They can send an engineer round with a thermal imaging camera to see where but this will cost £150 anyone got any cheaper ideas before I go down this route

 

[jay]

Candle will tell if there is a draft :whistling:

 

[Mike]

how is the draft causing the tiles to be cold when the room is warm?