APPLICATION OVERVIEW
Insulation is placed between the joists and supported on netting (e.g. polypropylene) or timber battens.
An important consideration is to ensure that the insulation product used fills all gaps between joists to prevent air movement which can lead to unwanted heat loss.
RECOMMENDED PRODUCTS
While Knauf Insulation offer various insulation products into suspended ground floor applications, we would emphasise that site specific conditions should always be considered on a case-by-case basis and any generic product recommendations must always be subject to an onsite evaluation.
Why Mineral Wool
Friction fitting mineral wool between timber joists closes joints, reducing the potential for gaps and unwanted loss of thermal performance.
The flexible nature of mineral wool accommodates movements in floor ensuring all joints remain closed.
Typical U-values
Using Earthwool Omnifit Slab
| Ratio of perimeter to area (p/a)(m2) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Note: The U-values have been calculated assuming that the timber joists are 48mm wide at 600mm centres with a default fraction for the timber floor of 0.11 taken from BR443. Floor covering assumed as 18mm chipboard.
Typical U-values
Using Earthwool Omnifit Roll
| Ratio of perimeter to area (p/a)(m2) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Note: The U-values have been calculated assuming that the timber joists are 48mm wide at 600mm centres with a default fraction for the timber floor of 0.11 taken from BR443. Floor covering assumed as 18mm chipboard.
