Building Regulations

U-Value Calculations for Tapered Layers

Unlike heat loss through a flat board heat loss through a tapered layer is not consistent and varies across the cross-section size.

A tapered insulation U-value calculation takes into account:

  • Length and rate of fall
  • Hips and Valleys

At Linroc we always carry out a full calculation for each tapered design to ensure compliance with Building Regulations.

Building Regulations

Part L of the Building Regulations lays down target U values for each element of a building including flat roofs, these contribute to compliance with SAP or SBEM.

The current documents can be found here:

At Linroc we carry out full U value calculations for all of our designs, including condensation risk analysis when required.

For any project specific assistance please contact our design team on 01793 764 000