Building Regulations

Planning Portal Details for Solid wall insulation

EWI Pro Insulation systems need to be installed in accordance with Building Regulations

Building Regulations (Part L1B) sets out the energy efficiency requirements where more than 50% of a thermal element (see below) or more than 25% of the overall building envelope is being renovated.

The following renovation works are subject to Building Regulations:

  • Applying a new layer (e.g cladding) or rendering the external surface or dry-lining the internal surface)
  • Replacing an existing layer (e.g. stripping the wall back to brick and rebuilding)

In the case of walls the thermal element refers to a wall, which separates the heated part of the building from the external environment.

This means that all external wall insulation is therefore notifiable with Building Control. It also means that whatever renovation you are undertaking to your wall, if it affects more than half the wall (or more than a quarter of the overall building envelope) you will need to add insulation to improve the thermal performance of the whole of that individual thermal element.

The Building Regulations (Part L1B) requirement is to ensure walls have U-values of no more than 0.3 W/m2K. (The U-value is a measure of the flow of heat through a thermal element. The lower the U-value the better an insulator it is.)

To learn more about Building Regulations and how they impact solid wall insulation please click on any of the links below:

PART L – DWELLINGS
>>> Approved Document L1A: Conservation of fuel and power (New dwellings) (2006 edition) <<<

>>> Approved Document L1B: Conservation of fuel and power (Existing dwellings) (2006 edition) <<<

PART L – BUILDINGS OTHER THAN DWELLINGS
>>> Approved Document L2A: Conservation of fuel and power (New buildings other than dwellings) (2006 edition) <<<

>>> Approved Document L2B: Conservation of fuel and power (Existing buildings other than dwellings) (2006 edition) <<<