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Hi I have been asked to tile a kitchen floor and install under floor heating , the problem is there is no room for insulation has there is very little room between the top of the appliances and the work top.The house is a new build with a 150mm concrete slab with kingspan insulation under neath it. I have googled it and got mixed responce some say it will take longer to heat up but the concrete will act like a storage heater if it is insulated underneath,some say do not bother fitting it with out insulation. Any comments much appreciated ( this is not to be the main source of heating )

Hi Jack.

As you say, the concrete will eventually warm up and the heat will last for a while, however with UFH you want results within 20 minutes of pressing go.

Marmox supply 4mm insulation/building boards which while not offering a great depth of insulation, will help with the warming of the room greatly.

May I just ask why this isn't the main source of heating for the room? There's really no need for other heaters in an area where UFH is being used, it's more efficient than central heating radiators as heat rises, and a rad stands at least a meter off the floor, covering only a small area.

Cheers

Cheers for your reply matt when I said it is not the main source off heating, It might end up so, there main concern is there dog does not get cold feet while they are at work in the winter months.

DTWCeramics wrote:

That's only useful if the dog stays in one place. What they really want is a set of these.

Nice one I might get them some of those for the crack

DTWCeramics wrote:Hi Jack.

May I just ask why this isn't the main source of heating for the room? There's really no need for other heaters in an area where UFH is being used, it's more efficient than central heating radiators as heat rises, and a rad stands at least a meter off the floor, covering only a small area.

Cheers

It's not quite as simple as that, as they heat a room in very different ways, central heating by convection current and UFH by radiation. Which is more efficient really is down to the specs and the room it's heating. UFH can be incredibly efficient it can also be incredibly un-efficient! If installed incorrectly.

It is quite normal to have both systems in a room

This be true! I've found that rooms with a nice flat ceiling do better with rads, yet ones with dividers seem to do better with UFH :)