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Insulation for Underfloor Heating

Underfloor heating flooring insulation solution, Celotex FI5000, provides excellent dimensional stability in underfloor heating applications, paramount for installing underfloor heating products

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Underfloor heating may not be a modern invention, but its design today is vastly different to the systems employed by the Romans! As a result, it remains a desirable feature, particularly in domestic properties.

Wet systems, comprising a carefully designed run of pipework carrying heated water throughout the living space, are efficient and neatly encapsulated within a concrete screed, adding no extra thickness to the floor construction.

To maintain that efficiency and avoid unnecessary energy use, underfloor heating is best installed above an insulation layer. If it’s laid on a concrete slab, the system has to work harder warming the slab as well as providing the space heating it was specified for.

For that reason, a wet underfloor heating system is usually used in conjunction with insulation installed above the concrete slab, or on a suspended concrete floor deck. It can be a feature of upgraded uninsulated floor constructions, and it’s also possible to incorporate underfloor heating systems into suspended timber floors by leaving an airspace between the insulation and the floorboards to run the necessary pipework.

Rigid polyisocyanurate (PIR) foam insulation boards, such as those manufactured by Celotex, are among the most thermally efficient, commonly available insulation materials, meaning they allow the underfloor heating to do what it is designed to do. The boards are lightweight - making them easy to handle, cut and install - but capable of holding the pipe clips that secure the heating pipes in their designed position.

 

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