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Frequently Asked Questions : Floors

Is there a Kingspan Insulation product for floating floors?
Yes. Kingspan Insulation recommends Kingspan Thermafloor TF70 zero ODP is recommended for domestic floor applications, tongue and groove timber boarding. For heavier duty applications, Kingspan Thermafloor TF70 fitted between battens is recommended or use Kingspan Thermafloor TF73 - a heavier insulation with chipboard.

What is the minimum screed thickness required over Kingspan Insulation’s flooring products?
The recommended minimum thickness of screed is 65 mm for domestic floors and 75 mm for non-domestic. This can be replaced with a thinner reinforced screed that has the equivalent strength of the above mentioned non-reinforced screed depths.

What information do you need in order to calculate the U-value of a Floor?

  1. Construction - The floor construction build-up.
  2. Exposed Perimeter - The length in metres of the perimeter exposed to the outside or unheated areas e.g. gardens.
  3. Floor Area - The internal floor area in square metres,
  4. Soil Type - Type of soil beneath the building - Where soil type is unknown,
    clay soil is assumed as this is the most typical soil type in the UK.

When laying a screed on top of floor insulation, do I require a separating layer?
Yes. Insulation boards should be overlaid with a separating layer of building paper to BS1521: 1972 (1994) grade B1F, or polythene sheet not less than 125 micron / 500 gauge. This would then be covered by the screed.

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