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Underfloor heating a typical extension to an older property

15th June 2017

We are frequently approached to provide an underfloor heating system for extension projects on Victorian properties. With our latest case study we hope to offer some insight to our unique approach and materials and how they can be used to produce an effective and seamless underfloor heating system.

The intention is often to pour a new slab or install a beam and block floor in the extension area at a height to match in with the existing floor. This however poses a few problems for a successful underfloor heating installation:

  • Installing pipework in the new screed/slab will result in a disparity in system responsiveness;

  • Differential movement between the two substrates may cause floor failure;

  • Introduces unsightly movement joints;

  • Floor height increase in the retrofit area.

Adopting our unique screedless approach to underfloor heating and making use of our Screed Replacement Tile solves these issues. 

The above image depicts the mixture of floor constructions typical of an extension to an older property

Our EPS-40G construction may be installed over the new solid floor at a height to match the adjacent EPS-BJ2G construction in the retrofit area. Using the same Ideal EPS heating panel and Screed Replacement Tile in both constructions ensures that the same level of heat output and responsiveness is experienced in the extension as in the existing building fabric.

In the retrofit area the Ideal EPS panel should be installed between the joists on a ply deck which is in turn supported by battens screwed into the sides of the joists. The intention is that their 0.5mm thick aluminium heat diffusion plates are flush with the tops of the joists and in solid contact with the Screed Replacement Tile layer installed above, ensuring efficient heat transfer between the aluminium and our low thermal resistance tile layer. If there is sufficient depth in the joists a high compressive strength insulation such as Kingspan K103 can be cut to fit and installed betweent the ply deck and the heating panel as shown below and in EPS-BJ2G.

Ground floor joisted construction with the Jupiter Ideal EPS heating panel and Screed Replacement Tile

In the new extension area the intention should be to cast the new floor in such a way that the subsequent application of levelling compound and insulation leaves the topside of the insulation 30mm below the tops of the adjacent joists. In doing this the heating panels and Screed Replacement Tiles can be run seamlessly across the two substrates. The concrete substrate should be levelled to +/-3mm over a 2m span (SR1) before the insulation is applied to it to ensure the best quality of installation. Similarly, the heating panels and Screed Replacement Tiles would ideally be installed immediately after the insulation to minimise the risk of it being damaged.

The Screed Replacement Tile once installed can be used as a working floor provided care is taken to avoid sudden impacts such as dropping hammers.


The SRT system being used as a working floor on a new development

 Why not have a look at some of our other case studies?

If you are planning to include underfloor heating in your extension project we'd love to hear about it! Please get in touch for advice or a quote by clicking here


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