Underfloor Heating
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Installation

Standard installation of a Thermotech under floor heating system starts with laying of insulation, such as Cellotex. Please note that the cost of the insulation is not included in the quotation because this will already be included in your building costs. However, the cost of laying the insulation is included and this should be deducted from your building costs.
Alternatively, we now also offer a Self Preparation Allowance on all our under floor heating quotes for those who wish to carry out the above work themselves.

Next the underfloor heating loops are installed and secured. Each heating loop is returned to an accessible manifold with no intervening joints and each underfloor heating zone is connected to actuator heads for thermostatic control. In addition we install the blending valve, circulating pump and associated pipework.

Finally a high-pressure test is carried out on the underfloor heating loops and a certificate is issued which the Thermotech engineer and the client’s on-site representative sign. The floor screed should be laid over the underfloor heating loops as soon as possible to prevent damage to the heating loops.

If you have opted for Thermotech flowing floor screed then this will be included in the installation plan.

The client, or main contractor, should be aware that in the case of cement screeds the underfloor heating must not be used to dry the screed or the structure of the building until the screed has been allowed to dry naturally. Your screeding contractor will be able to advise you on when and at what temperatures the heating may be used, as this will depend on a number of factors that include the depth of the screed, the exact product used, relative humidity and temperature.
However, in the case of Thermotech Liquid Screed for underfloor heating, the underfloor heating may be used after the first seven days to assist in the drying of the screed, providing the guidelines are followed. Thermotech will issue these guidelines on request after the underfloor heating screed has been supplied, as again they are subject to the material used and cannot be given as general advice.
If a liquid screed for the underfloor heating is supplied by someone other than Thermotech then the supplier's advice must be sought for the specific product used.

Thermotech liquid screed for underfloor heating is ideal for underfloor heating systems and will enhance the response time of any underfloor heating system. The liquid screed is pumped onto the floor as a liquid and as such completely surrounds the underfloor heating loops. Conventional screed is a semi-dry mix and tends to leave air pockets around the underfloor heating pipes thus reducing the surface contact between the screed and the heating pipes. As trapped air makes a good insulator this is the last thing you want around the heating loops.
Also because liquid pumped screed has virtually no air in the mix it can be laid at a reduced depth, for an underfloor heating system that uses 15mm or 16mm pipe the recommended screed depth would be 50mm, yet retain the same strength as a conventional screed. This reduced depth means that there is less screed between the underfloor heating loops and your feet.
The combination of the above factors make for a quicker warm up and better temperature control.

In addition, any cement based materials including traditional sand and cement screed shrinks as it dries. When these materials are used with underfloor heating this effect is combined the with constant expansion and contraction movement as the underfloor heating pipes warm up and cool down. By using a liquid calcium sulfate screed for your underfloor heating, which does not have a cementitious binder, this problem is eliminated. Thermotech flowing floor screeds for underfloor heating are available to customers that have purchased other underfloor heating systems but want to make use of the improved technology in liquid underfloor heating screed.

All that remains is for your electrician to install and connect the supplied thermostatic digital room programmers and underfloor heating control centre, and your plumber to connect the underfloor heating manifolds to your heat generator in accordance with the simple instructions that will be provided.

Using the same provider for your underfloor heating and screed not only overcomes the planning and co-ordination issues that can arise between different companies, but it can also eliminate other difficulties and disputes.

Co-Construct, in a publication entitled "Screeds with Underfloor Heating - Guidance for a defect-free interface" state the following:
Underfloor heating is an established technology. However, while the design and operating principles are well known to building services engineers, the finer points of design and installation may not be known by other specialists such as structural engineers, concrete contractors, installers and facilities managers.

Disputes commonly occur on-site where particular items of work were assumed to have been carried out by another party, and as a consequence the work was not completed. With water-based underfloor heating, a common interface problem is between the heating element installation and the screed. If these interface problems are not understood, failures in system performance and/or failure of the screed may occur.

This publication, the first in a series of similar guidance notes called Interface Engineering Publications, has been compiled by BSRIA and the Concrete Society. The objective of this publication is to provide building services engineers and screed specialists with consistent, interlocking advice on how water-based underfloor heating systems and screeds fit together technically, and in relation to the work programme.

By using Thermotech for the underfloor heating, and the screed for underfloor heating, then many of these problems can be eliminated.