Insulation for Pitched Roofs at Ceiling Level

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Pitched Roof: Ceiling Level (Cold Roof/Loft Insulation)

APPLICATION OVERVIEW

Our loft insulation solutions provide the most cost effective insulation solution with regards to the ratio of cost to energy saved as insulation thickness is largely unrestricted, allowing very high levels of thermal performance.

The first layer of insulation is laid between the joists to the same depth as the ceiling joists, with subsequent layers being laid at right angles to the ceiling joists, with all edges butt jointed to prevent thermal bridging and unwanted heat loss.

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RECOMMENDED PRODUCTS

WHY MINERAL WOOL?

  • Insulating at ceiling level provides the most cost effective insulation solution in terms of ratio of cost to energy saved.

  • Very low U-values can be easily and economically achieved

Download our Solutions Guide  Download our Pitched Roofs Ceiling Level PDF

Typical U-values
Using Earthwool Loft Roll 40

U-value (W/m2K) Thickness (mm) 
 Between joistsOver joistsTotal thickness
0.08100400 (2 x 200)500
0.09100350 (150 + 200)450
0.10100300 (2 x 150)400
0.11---
0.12100250 (100 + 150)350
0.13100200300
0.14---
0.15---
0.16100150250

Typical U-values
Using Earthwool Loft Roll 44

U-value (W/m2K) Thickness (mm) 
 Between joistsOver joistsTotal thickness
0.08   
0.09100400 (2 x 200)500
0.10100350 (150 + 200)450
0.11100300 (2 x 150)400
0.12100250 (100 + 150)350
0.13---
0.14100200300
0.15---
0.16100170270
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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.