Hi-therm Lintel

The low cost solution to
reduced carbon emissions
and improved
Fabric Energy Efficiency

Split Lintels


IG Lintels leads the way with the development of a completely unique lintel range to address the thermal requirements of new building regulations, which require that lintels should be assessed for their effect on the thermal performance of a building. The thermal performance of a lintel is expressed in terms of Psi Values (ψ) i.e. linear thermal transmittance.
zero carbon lintels

Key Benefits

The Hi-therm lintel is unsurpassed in terms of thermal efficiency, buildability and technical support.

Thermal Efficiency

Hi-therm is the only one piece lintel which achieves the Appendix R value for steel lintels in Part L 2013.

Up to 5 times more thermally efficient than a steel cavity wall lintel.

Cost Effective

Low cost alternative to stainless steel – NHBC approved for use in coastal areas.

A low cost route to improved Fabric Energy Efficiency.
A low cost sustainable solution to CO2 reduction within SAP.


Better Buildability – offers the simplicity of a one piece lintel solution which achieves these significant advantages through traditional building practices, unlike a two part lintel solution.

Maintenance free – no maintenance required unlike other sustainable technologies.

No DPC required up to areas classified as very severe by NHBC.

Better Buildability

Split lintels – in some cases split lintels may be offered as a means of enhancing thermal performance however they are in no way comparable in terms of efficiency or buildability to the Hi-therm sustainability lintel.

Good Detailing


  • No DPC required *
  • Hi-therm closes the cavity
  • The single component design simplifies installation
  • The one piece design assists stability between the internal and external leaves and creates stability during the build process
  • Top insulation integrates well with cavity wall insulation for optimum performance

Poor site Detailing

Split Lintel

  • An additional DPC is required on all installations and requires skilled positioning ££
  • A cavity closer must be supplied and fitted ££
  • Requires two separate lintels with double the handling and installation labour ££
  • Individual lintels will require propping and additional wall ties will be required to overcome the lack of inherent stability in a split lintel solution ££
  • Creates a difficult to insulate cavity requiring a complex solution to achieve continuous insulation ££

Hi-therm gives cost certainty with no additional costs

££ – Additional costs

Cost Comparison

Comparison of the different solutions to reduce carbon emissions.

This case study is based on an actual semi detached 75m2, 3 bedroom house design and the figures were produced by an independent energy assessor using SAP 2009 software.

Cost comparison to Improve Fabric Energy Efficiency by 1kWh/m2/year