Underfloor Heating

Over the last 10 years underfloor heating has started to become the most popular way of heating homes. Many of the benefits include reduced gas bills due to the fact that underfloor heating allows the boiler to run at lower temperature. A Green & Son have installed underfloor heating systems which have been integrated with the latest green technology such as air source and ground source heat pumps. There are two types of floor construction that underfloor heating can work with.

  • Solid floor construction
  • Timber suspended


In concrete screeded floors, the screed acts to diffuse the heat across the surface providing an even temperature at the floor surface. Depending on the type of building and the construction there are a number of methods of laying the underfloor heating pipes in concrete floor structures. The most popular method of installation is as follows:

  • A concrete slab (or suspended beam and block construction) is laid over a damp proof membrane. A 20mm thick piece of insulation is fixed to the perimeter (external) walls, to a height to include the depth of floor insulation and screed.
  • Whilst the edging insulation may be on show it is covered by wall plastering and skirting boards.
  • Floor insulation is laid to the whole area, joints are taped to prevent the ingress of screed between the insulation boards. The floor is now ready for the underfloor heating pipework installation.
  • We recommend you use a minimum of 50mm layer of Polyurethane insulation. We recommend Polyurethane as it out performs Polystyrene and its greater density allows use of clip fittings. All insulation requirements need to comply with the current building regulations.
  • Finally 65 – 75 mm screed is laid on top of the insulation and the pipe.
  • If you use polystyrene insulation (50mm) it is recommended that you install wire mesh on top of the insulation and tie the pipe to the mesh


Timber suspended floors do not conduct heat as efficiently as screeded floors. This means that the heat output is less.

Our system is very simple and easy to install in timber suspended floors. The system is based on hundreds of installations that are now working with total satisfaction.

Between the joists, a 50mm polyurethane insulation board is cut for a tight fit. The pipe is then clipped on the insulation. To get the timber suspended floor to act as a screeded floor and to give out more heat, the air gap between the insulation and the floor boards should be filled with a lightweight screed mix.