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Requirements for installation of hardwood flooring and under-floor 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.
  • 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.
  • Manufacturer warranties are contingent on the floor temperature being kept under 27 C° and the RH of the environment kept between 40 and 60% RH.
  • The under-floor heating should be switched off before installation of the flooring, and should then be brought on gradually not before 48 hours after installation.
  • When the heating is switched on the heat should be introduced gradually aiming to increase the floor temperature by no more than 2 C° per day.
  • 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 building may require secondary sources of heat to maintain the building temperature whilst the floor is protected.
  • The building may require dehumidification in order to ensure the Relative Humidity specification is maintained.
  • The maximum temperature for the surface of the 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.
  • It is important to note that even short-term breaches of temperature and humidity limits can cause significant damage to floors.
  • We recommend the use of Fidbox electronic monitoring devices under the floors to ensure that the required temperature and humidity conditions have not been breached during construction and through the defects liability period.
  • 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.
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With over 15 years of experience within the industry, Paolo is an expert consultant of stone, tiles and wood flooring. Driven by the passion of what is aesthetically pleasant and practical at the same time, Paolo has a strong voice within the marketplace and he is not afraid to use it.