Borders Underfloor Heating supply water filled underfloor heating for concrete and suspended timber floors

Underfloor Heating in a Slab Plus Screed or Beam and Block Floor Construction

This is by far the most popular and effective floor construction technique for underfloor heating. The screed provides good conductivity to transfer the heat from the pipes to the floor surface. Reducing the total amount of thermal mass by placing the insulation under the screed, means that the response time will be quicker and it will be more economical than if using a solid slab construction. Liquid pouring screeds are increasingly used instead of concrete. These gypsum based screeds are extremely strong, very durable and provide a working surface 24 hours after pouring. They are not prone to shrinkage cracking, and are much more thermally stable than concrete. If using a pouring screed, the thickness can be reduced from 60 - 75mm to around 50mm.

Underfloor Heating in a Slab Plus Screed or Beam and Block Floor

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slab plus screed with ufh floor diagram

This technique is preferred by many builders, and certainly by us. A concrete sub-base is poured and the construction of the house may then continue right up to second fix before the pipes need to be installed. High density extruded polystyrene insulation is used at a thickness to satisfy building regulations or preferably beyond. We currently recommend a minimum of 75mm thickness. The pipes are attached to the insulation and a 60mm - 75mm concrete screed is poured around the pipes to give at least 40mm cover over the pipes. This gives good thermal conductivity with a faster response time than a full concrete slab. You can also use a pouring/anhydrite screed.

Photo - Slab plus screed or beam and block floor with underfloor heating pipes installed

Close-up Photo - Slab plus screed or beam and block floor with underfloor heating pipes installed

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Home Welcome Services Benefits How It Works Schematics Diagrams Renewable Energy Heat Pumps Case Studies Single Zone Packs Gallery Floor Coverings Guarantee UFH FAQs Knowledge Quotes Myths Roman Innovation Who We Are Contact Us Underfloor heating supplied and installed throughout the UK by Borders Underfloor Heating. Our system carries a full ten year all risks guarantee! Quality comes as standard. © Copyright 2009 Borders Underfloor Heating Ltd. All rights reserved. All rights, including copyright, in the content of these web pages are owned or controlled by Borders Underfloor Heating Ltd. Except where expressly stated otherwise, you are not permitted to copy, store, adapt or change in any way the content of these web pages for any purpose whatsoever without the prior written permission of Borders Underfloor Heating Ltd. We will prosecute any individual or company found to be using our text or images without permission.