Requirements for Installation of Hardwood Floors and Underfloor Heating

  • The building should be enclosed and all wet trades completed
  • The sub floor should be installed at similar moisture conditions to the floor. This means 6-8% moisture for timber substrates and less than 75% Relative Humidity (RH) for screeds (3.5%MC maximum).
  • The under floor heating system needs to have been commissioned and run to check that it is working with no leaks and to drive out residual moisture from the sub floor. The heat should be introduced gradually to prevent the sub floor warping or screed cracking.
  • The building temperature and humidity should be controlled in the range 15 -21 C° and 40-60% RH from the time of installation onwards.
  • Manufacturers warranty’s are contingent on the sub-floor floor temperature being kept under 27 C° and the RH of the environment kept between 40 and 60% RH.
  • The underfloor heating should be switched off before installation of the flooring, and should then be brought on gradually not before 48 hours after installation.
  • Timber floors should be acclimatized in conjunction with the turning on / commissioning of the UFH system and in most instances the UFH commissioning guidelines will echo our own requirements but please see below for our criteria
  • When the heating is switched on the heat should be introduced gradually and run on its lowest setting for two weeks. Following this the temperature can be increased by no more than 2 C° per day. A log / commissioning certificate should be completed.
  • Whilst the floor is protected it should never be covered with an impermeable surface such as correx as this will cause the floor to sweat especially if the heating is switched on.
  • Whilst the floor is protected the floor should be kept at a low heat as the protection forms an insulation layer that could cause the floor to overheat.
  • The maximum temperature for the surface of the sub-floor at any point is 27 C°. It is recommended to fit floor thermostats to ensure this limit is not breached. Room thermostats do not necessarily regulate the temperature at floor level and hence can cause the floor to overheat so surface floor probes must be instated to the manufacturers guidelines.
  • It is important to note that even short-term breaches of temperature and humidity limits can cause significant damage to floors.
  • Hardwood floors should not be washed with water as part of a builders clean. The maintenance requirements for different floor finishes vary and these requirements for your floors will be provided separately.

Click here to download a copy of these requirements.

on November 7 | by

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