Menu

Under-floor heating is now the heating system of choice for heating buildings in the UK.

How it works

The system works by circulating warm water through pipes in the building’s floor.There are under-floor heating systems available for all types of floor constructions:

 

 

It can be used on the ground floor as well as upstairs and you can put just about any floor covering (tiles, laminate, stone, timber, carpet*) over the under-floor heating, our technical team can advise you on appropriate floor coverings for your system.

Floating Floor Installation

This is an ideal system for retrofitting under-floor heating, or as an alternative to screeded floors.

The system comprises of pre-grooved 30, 50 or 70mm polystyrene insulation floor panels and end returns designed to be used with heat emission plates.

The floating floor panels can be laid on almost any existing floor surface. It is essential that the floor is clean and level as any imperfections in the slab will be projected through to the finished floor. If self-levelling compound is being used to level the slab it must be allowed to dry before laying the floating panels.

Most floor finishes can be laid on top of this system apart from tiles.

Solid Screeded Floor

The most cost effective way of installing under-floor heating is onto a solid floor.

The pipes are laid on insulation then covered with screed (either traditional sand/cement or specialist flow screed) which acts as the best heat conductor making this system the most responsive.

Where the pipe is laid on insulation with sand/cement screed the minimum screed depth must be 65mm for domestic and 75mm for commercial applications. The same situation with flow screed will only call for a nominal screed thickness of 50-55mm coverage.

All screed must be allowed to dry and cure normally in accordance with the relevant BS Standards before initial heating and system start-up.

When installing onto floor grade insulation, pipes should be spaced 100mm away from the wall edges. In well-insulated domestic buildings the pipe centres are generally laid at 200mm centres across the active floor area (using 15 / 16mm pipe).

Under-floor heating must not be used to speed up the curing process.

Timber Suspended Floor

This application is suited for both new and existing buildings.

Under-floor heating pipework can be laid between timber joists with the help of heat emission plates. The plates are designed for suspension over joists at 400mm centres and are manufactured with grooves set at 200mm centres. If joist centres are different a method of cross battening is available to give support to the plates and enable this system still to be installed.

On new floors, insulation is laid between the joists. Heat emission plates are used to spread the heat evenly, the plates being secured directly onto the battens or joists. The groove in the plate is designed to grip the pipe securely. Once the loops are laid, connected up and pressure tested, the floor deck can be fixed to the joists. The maximum heat output from timber flooring is 70W/m2 with a room temperature of 20°C and a floor temperature of 27°C.

It is essential that insulation is installed between joists as close to the underside of the plates as possible. Typically a minimum 100mm of mineral wool insulation is used, however where relevant, the insulation used must comply with current Part L of the Building Regulations.  All other services such as cables and plumbing pipes should be laid before the under-floor heating.

Overlay Systems

This system is designed specifically to enable under-floor heating to be installed in areas where floor height might be an issue.

The panels are made of dense fibrous material and are only 18mm deep enabling under-floor heating to be installed over existing floors. The pipe used in this system is 12mm in diameter.

The panels get glued to the existing floor with special glue and most floor finishes can be laid on top of this system.

A levelling compound may need to be used to take out any imperfections in the floor prior to the installation of the boards.

Benefits of Under-floor Heating compared with traditional radiators

  • Lower running costs.
  • Even distribution of heat across the room – the gentle heat radiates up from the floor rather than from one hot radiator at one point in the room.
  • Wall space is not taken up.
  • Very little maintenance is required – the systems are fully automatic.
  • Individual room temperature control
  • Quiet – no more noisy systems or sounds of water running through pipes in the walls
  • Luxurious – adds perceived value to your property.