Technical Tips For Installing Underfloor Heating

Underfloor heating (UFH) can be used with virtually all flooring materials and is easy to install but here are a few technical pointers to help make the process even easier.

Tiling, stone and slate floors in conjunction with underfloor heating

Most underfloor heating systems can be used with tiling, however be sure to use a solid bed of flexible adhesive that is compatible with the chosen underfloor heating system. Also, where screed is being heated, either electrically or with wet under floor heating, expansion joints should be allowed for every 40m2 or 8m length.

Timber floors and underfloor heating

Used successfully with underfloor heating for more than 50 years in other countries, the main factors to consider with timber floors are the moisture content of the timber, their heat conducting properties and the type of timber - close grained hard woods tend to be the most stable. Always check for suitability with your supplier. If using sawn timber it is important to ensure that the moisture content of the timber is about 7%.

Underfloor heating may dry out the timber during winter months when the heating is on, and when the heating is off during the summer it may swell due to the moisture levels in the atmosphere. It is therefore advisable to condition the timber prior to installation and ensure that the supplier is happy that it is being used in conjunction with underfloor heating.

The width to thickness ratio is also important. A ratio of 4 to 1 is ideal but not always practical as the heat output from the underfloor heating could be compromised if timber much thicker than 22mm is installed on floors.

Engineered wood floors and underfloor heating

Ideal for use with underfloor heating, engineered wood floors tend to have greater stability than a timber plank. They should have at least 11 layers to give the board stability and should only be used as recommended by the supplier/manufacturer.

Insulation and underfloor heating

To ensure maximum efficiency it is vital to insulate beneath the underfloor heating system. This prevents downward heat loss and reduces heat-up times.

Plan ahead for underfloor heating

Aim to ensure that underfloor heating pipework is laid immediately before the floor screed or final floor covering goes down. This will minimise any potential damage caused by people walking on it. Also, plan for the site to be clear of other workmen when the system is being installed, as access to the whole floor area will be required.

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