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Underfloor Heating Installation: A DIYer's Guide

installing underfloor heating
(Image credit: c/o Wunda Group)

When it comes to underfloor heating installation, competent DIYers could save themselves a bit of money by taking on the task themselves (although the manifold for a wet system will need to be installed by a qualified professional).

Underfloor heating is on the wishlist of many self builders (and renovators) as they strive for the optimum in home comfort, energy efficiency and, in some cases, contemporary, minimalist design.

If you are installing underfloor heating in an existing house, you will need to make sure you opt for a low profile system. 

As always, only take on DIY projects that are within your capabilities.

(MORE: The DIY tasks you should leave to the professionals)

Nine Steps to Follow for Perfect Underfloor Heating Installation

installing underfloor heating

(Image credit: c/o Wunda Group)

1. The first step is to connect the floor heating pipe to the manifold.

(MORE: Underfloor Heating Manifolds)

installing underfloor heating

(Image credit: c/o Wunda Group)

2. After laying your insulation, you will need to begin to lay the pipe.

installing underfloor heating

(Image credit: c/o Wunda Group)

3. Secure the pipe to the insulation as you go using pipe staples.

installing underfloor heating

(Image credit: c/o Wunda Group)

4. Ensure you fix the pipe with the correct spacing to ensure optimal heat distribution.

installing underfloor heating

(Image credit: c/o Wunda Group)

5. Loop the pipe across the whole floor area. Use multiple loops for large spaces.

installing underfloor heating

(Image credit: c/o Wunda Group)

6. Prepare the screed (or opt for a ready-mixed version).

Before you pour the screed…

The pipes must always be pressure tested before the screed is laid. Equally important is to ensure the pipes are full of water while the screed is being laid so that if there is any damage it will be immediately obvious and can fixed before the screed laying is finished.

(MORE: A Screed Masterclass)

installing underfloor heating

(Image credit: c/o Wunda Group)

7. Carefully pour the self-levelling screed over secured pipework.

installing underfloor heating

(Image credit: c/o Wunda Group)

8. Stabilise the screed with a chemical spray.

installing underfloor heating

(Image credit: c/o Wunda Group)

9. Finally tamp the screed for a smooth finish.

Tim Pullen

Tim is an expert in sustainable building methods and energy efficiency in residential homes.