SUSPENDED TIMBER GROUND FLOORS
Under Floor Insulation

Suspended Timber Ground Floors

Knauf Insulation Suspended Ground Floor Insulation Glass Mineral Wool

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.

Icons_0.png

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.

Download our Solutions Guide     Download our Ground Floors PDF

Typical U-values
Using Earthwool Omnifit Slab

              Ratio of perimeter to area (p/a)(m2)
 0.10.20.30.40.50.60.70.8
3000.090.110.120.120.120.120.130.13
2500.100.120.130.140.140.140.150.15
2000.120.140.160.160.170.170.170.18
1500.130.170.190.190.210.210.220.22
1000.160.210.240.250.270.280.280.29

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)
 0.10.20.30.40.50.60.70.8
3000.100.120.120.130.130.130.140.14
2500.110.130.140.140.150.150.150.15
2000.120.150.160.170.170.180.180.18
1500.140.170.190.200.210.220.220.23
1000.160.210.240.260.270.280.290.30

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.

For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766666.
For written U-value calculations, please complete our contact form by clicking here, including details of your full through construction build-up and we will respond accordingly to meet your requirements.