Underfloor Heating Systems

Reid Underfloor Heating systems are suitable for all types of wet central heating systems whether they be conventional, combination or condensing boilers, solid fuel, oil or gas.  Heat pumps are ideally suited for underfloor heating due to the lower running temperatures required.

Underfloor heating can be fitted under a screed, timber joist or floating floor and will provide a comfortable surface underfoot no matter what floor covering you choose, whether it be carpets, vinyl, wood or ceramic (the floor covering will effect heat output and this should be taken into account at the design stage). 

To function correctly, underfloor heating systems require water temperatures of between 35C and 55C.  These temperatures are obtained by blending the flow water with the return water by use of a thermostatic mixing valve.   


Screeded System - Insulation is laid, pipe is tacked onto the surface and a screed (typically 75 mm thick) is laid over the top.  Primarily used in new build projects or full refurbishments. 

This system allows variation in pipe centres and can be used with any standard, medium or high density insulation.  A screed barrier should be put in place to protect the insulation from the screed.  Due to its flexibility this system gives the best heat output.

The design and installation of the screed must conform to British Standards and Codes of Practice.







Joisted System, Plated - Designed for timber joisted floors with joists typically at 400 mm centres.  Insulation is laid between the joists, pr-grooved aluminium diffusion plates are tacked onto the joists with the pipe then inserted into the grooves.  Standard flooring can then be installed on top.






Floating floor system -  Designed to have the finished floor floating on the underfloor heating. Diffusion plates and pipe are installed within pre-grooved insulation.  Different thicknesses of insulation are available.  







System Variations

Other methods of installing pipework are available. 

 Biscuit System -  An alternative system for timber joisted floors.  Rigid insulation is laid on  runners and the underfloor pipework is attached to it. A dry mix (1:8) screed is laid up to the level  of the joists.  Advantages include increased heat output and the ability to cope with non uniform  joist spacing.  The weight of the screed will need to be factored into the construction.