Exposed Soffit Floors
Exposed Soffit Floors

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APPLICATION OVERVIEW

If insulating below the structural floor, insulation can be laminated to a variety of materials allowing the floor to be insulated and finished in one process.

In timber frame exposed soffits, insulation is friction-fitted between timber joists, using the whole depth of the joist as an insulation zone. This allows high levels of thermal insulation performance.

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RECOMMENDED PRODUCTS

Why Mineral Wool?

  • Provides a solution to upgrade thermal performance of exposed soffit floors.

  • Excellent sound absorption characteristics provide high levels of sound reduction.

Download our Solutions Guide     Download our Exposed Soffit Floors PDF

Typical U-values
Using Earthwool Soffit Linerboard Standard to a sheltered area below

 Beam & Block floor thermal conductivityPrecast plank 150mmCast concrete 200mm
Thickness (mm)
1.130.510.340.160.11
1.302.30
165
0.190.180.180.170.16
0.190.19
130
0.230.220.220.200.20
0.230.23

NOTE: There are specific additional requirements that need to be taken into to  consideration when calculating the U-values for elements that are adjacent to unheated spaces. The U-value of an exposed floor (soffit) which separates a heated area from an unheated area can be calculated by including an additional amount of thermal resistance (Ru) due to the sheltering effect of the unheated area. Standard default values of Ru can be taken from BR 443 (Conventions for U-value calculations) or SAP 2009.

Typical U-values
Using Earthwool Soffit Linerboard Extra to a sheltered area below

 Beam & Block floor thermal conductivityPrecast plank 150mmCast concrete 200mm
Thickness (mm)
1.130.510.340.160.11
1.302.30
165/6
0.190.180.180.170.16
0.190.19
130/6
0.230.220.220.200.20
0.230.23

NOTE: There are specific additional requirements that need to be taken into to  consideration when calculating the U-values for elements that are adjacent to unheated spaces. The U-value of an exposed floor (soffit) which separates a heated area from an unheated area can be calculated by including an additional amount of thermal resistance (Ru) due to the sheltering effect of the unheated area. Standard default values of Ru can be taken from BR 443 (Conventions for U-value calculations) or SAP 2009. Thermal conductivity of the 6mm non-combustible facing board = 0.470W/mK.

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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.