Underfloor Heating

In this floor construction, the pipes are laid on top of insulation and a concrete of self-levelling screed is laid, ready for coverings of your choice.

1. Floor Covering
2. Minimum 65mm sand/cement or 50mm self-levelling screed
3. Minimum 8mm edge insulation
4. Pipe fixed to insulation with clips
5. Insulation to building regulations
6. Damp-proof membrane
7. Concrete slab

This floor construction is one of the most commonly used as it allows installation of the underfloor heating with no change to the floor level. More suited to higher flow temperatures.

1. Chipboard or hardwood covering
2. 25mm dry sand/cement mix 6:1 radio (biscuit mix)
3. Pipe fixed to insulation with clips
4. Minimum 25mm rigid board insulation
5. 9mm ply/sterling board
6. 25x25mm battens
7. Joists

This floor construction is best for underfloor heating in a joisted floor when used in conjuction with a heat pump. It allows for a screed to be used on top of joists.

1. Floor covering
2. Minimum 35mm (from top of Lewis/Duofor Plate) sand/cement or self-levelling screed
3. Pipe fixed to plates with clips
4. Lewis/Duofor dovetail plates
5. Joists (with insulation if necessary)