Underfloor Heating kit

How to install electric underfloor heating

Our Cableflor underfloor heating kit is very quick and easy to fit. It’s a modular system that can be fitted to any area without any previous training.

For this demonstration, we show 6 easy steps to fit heated flooring in a garage. If you are going to fit it in a loft, then you can usually skip the first 3 steps as your base floor is probably already insulated.

Step 1

To install electric underfloor heating on a concrete floor such as a garage, cellar or outbuilding, then the first step is to lay a damp proof membrane. This is basically a big plastic sheet that you can buy cheaply on-line. Simply roll it out and cut it to size with a pair of scissors – ensure that you run it up the wall by about 6 inches / 15cms. You can hold it in place with some duct tape to make it easier for the next step.

damp proof membrane

Step 2

Lay down insulation boards. This step is important as you can lose a lot of your heat through a concrete floor. Boards are also widely available on the internet and they deliver directly to your house. They’re very lightweight, a bit like polystyrene with silver foil on either side. Trim to size with a handsaw – they’re very easy to cut but don’t forget to wear a face mask.

Step 3

Next use standard sheets of flooring chipboard to cover the insulation. These can also be delivered direct to your house from an on-line supplier – you can usually buy all three elements from the same place. Each sheet has a tongue and groove along the edge, so you can push the the boards together to create a solid base. Trim to size with a saw and trim off the excess damp proof membrane. You are now ready to install electric underfloor heating.

underfloor heating assembly

Step 4

Using an underfloor heating cable is so much easier than using pre-assembled mats and work out cheaper. The benefit of using a cable is that you can fit it to any shape or size. It’s easy to go around obstacles or areas that don’t need heating (such as under cupboards etc.). Make sure the end that is going to be wired into the thermostat is near you power source for easy connection. The cable is then stuck down with tape in rows with a 10cm gap between them. Mark it out with a pencil first for an easier life.

underfloor heating assembly

Step 5

Our raised floor tiles are supplied in metre square sheets for rapid assembly – each sheet just clips into the next. Ensure that the cable sits in the channel on the underside of the tile. They should not pinched by the floor tile. You can trim the floor tiles to the nearest 10cm by simply unclipping tiles or tearing off whole rows. Cover the whole area.

underfloor heating assembly

underfloor heating installation

Step 6

To finish off the floor, use Karndean Loose Lay vinyl. We are a reseller and use it because of its thermal properties and high quality finish. There are 39 different ones to choose from, in wood and stone finish. Start laying in rows and when you get to the end of the first run, trim it to size. Use the off-cut to start the next row to avoid any waste.

It’s really easy to trim with a Stanley or craft knife – just score it where required, bend it and then trim off. The underside has a foam backing which ‘grips’ our floor, so you don’t need to use any glue if fitted tightly against the walls. If you would prefer to glue it, Karndean also supply a tackifier. This is a low odour adhesive which you can roller on to the chipboard.

underfloor heating installation

That’s all there is to it – most floors can be fitted comfortably over a weekend. If using in a loft, our raised floor tiles are very lightweight to make it easier to get it up there. The added benefit is that they can be torn into smaller sections if you need to get it through a loft hatch.

Use a qualified electrician to make the connections into the thermostat and power source.

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