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Underfloor Heating Installation Preparation

Turn a house into a home with a Central Underfloor Heating System.
MULTIZONE systems start at £1995 + VAT installed.

Bespoke Water Underfloor Heating Systems

Underfloor Heating
Add a touch of luxury to your home
with a new super energy efficient
Central Underfloor Heating System.

Underfloor Heating Installation Preparation

Preparing to install an underfloor heating system

When preparing your floors for the underfloor heating you will need to ensure you are:

• familiar with the required floor construction
• aware of any services that need to go in the floor
• aware of any items that will need to be fixed to the floor at a later date.

Preparing for underfloor heating in a solid floor construction

You need to make sure that there is a damp proof membrane laid above the concrete slab or block and beam floor. If any water pipes or electrical cables are to be routed through the floor they need to be fixed to the floor now - in conduit - before the insulation is laid. For the underfloor heating system, it can be easier to lay the flow and return pipes to the manifold and the cables back to the boiler and the room thermostats at this point. Other common places where pipes and cables may need to be fitted are island units in kitchens, electrical sockets in lounge floors and shower trays in wet rooms and bathrooms. Items that will need to be fixed through to the concrete base at a later date - for example the base of a staircase - need to have their exact position determined and marked out now.

Call 07733542299 if you would like an estimate for your project.

E-mail your plans to info@centralunderfloorheating.com

Preparing for underfloor heating in a suspended floor

As well as routing plumbing pipes and electrical cables through the joists first, you need to make sure that the chosen floor construction is going to fit between the joists and that the joists are deep enough and strong enough to take any notching that needs to be done. The joists need to cope with the weight of a 25mm thick sand/cement screed too (approximately 20kg/square metre). Steel beams can cause a problem if they are too high so it may be that holes need to be cut into them or the whole floor needs to be raised slightly so it is possible to cross the heating pipes over them.

What size pipe do I use to supply the distribution manifolds?

Manifolds that have up to 9 ports will need two 22mm pipes (one flow, one return) between them and the heat source. Manifolds that have 10 to 12 ports will need two 28mm pipes (one flow, one return) between them and the heat source.

What size cables do I use to connect to the thermostats?

Depending on which thermostats you choose, you will need a three core cable or a CAT5 cable between each thermostat and the manifold.

What other cables do I need to install?

You will need a 5 amp, switched, fused spur at each manifold location for the electrical supply to the underfloor heating components. You will also need to run a two core cable from each manifold location to the heat source. You will also need to have an isolating switch for this cable at each manifold location as it will be live.

Fitting the insulation

You may need to cut out grooves on the underside of the insulation boards so that they sit nicely over any pipes or cables that run along the top of the concrete base or through the joists. The top of the insulation should be completely flat once laid.

Fitting the additional membrane when using a liquid screed

If you are going to use a liquid screed on a solid floor you will need to lay an additional waterproof membrane over the insulation and six inches up the walls. You will need to tape the joints to ensure that the whole membrane is waterproof and holds the liquid screed in place whilst it cures.

Fitting the expansion/edging strip

All solid screeds need to have an air gap around their perimeter to allow for thermal expansion. This air gap is created by fitting a foam expansion strip around the perimeter of each screeded area. If a liquid screed is to be used, this is taped to the membrane - otherwise it can just be tacked or stapled in place.


Make sure the whole floor is free from rubbish, debris and other trades on the day the pipework is to be installed.

Call 07733542299 if you would like an estimate for your project.

E-mail your plans to info@centralunderfloorheating.com

Underfloor Heating Cost Manifold

Underfloor Heating Cost Installation

Underfloor Heating Cost Compact Manifold

Underfloor Heating Cost Suspended Floor

Underfloor Heating Cost Pipes

Underfloor Heating Cost Controls

Underfloor Heating Cost Solid Floor

Underfloor Heating Cost Medium Houses

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