SUSPENDED TIMBER GROUND FLOORS
SUSPENDED TIMBER GROUND FLOORS

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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.

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RECOMMENDED PRODUCTS

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 Slab

              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.

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For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766 666.
For written U-value calculations, please email details of your full through construction build-up to technical.uk@knaufinsulation.com and we will respond accordingly to meet your requirements
We are a fully accredited member of the industry leading British Board of Agrément (BBA) U-value and Condensation Calculation Competency Scheme which promotes and assists accurate, objective and consistent calculations of U-values and condensation calculations within the UK construction industry. As part of our ongoing participation in the scheme, we are required to maintain written records for audit trail purposes.