Hi-therm+ Lintel

The Original is now even better

The award winning Hi-therm lintel has been upgraded to offer even greater practicality to builders. IG has invested heavily in Research and Development to re-engineer the Hi-therm lintel utilising our industry leading top hat design.

Key Benefits

Thermal Efficiency

Hi-therm+ is the only BBA Approved one piece lintel solution which achieves the appendix R value for steel lintels in Part L 2013. Up to 5 times more thermally efficient than a standard steel cavity wall lintel therefore reducing thermal bridging & improving SAP calculations.

Cost Effective

A low cost route to improve both CO2 reduction & Fabric Energy Efficiency standards in line with Part L Building Regulations (see page 12 to compare Hi-therm+ cost efficiency with other popular alternatives).


Better buildability – offers the simplicity of a one piece, structurally superior top hat design creating stability during the building process, unlike a two part lintel solution. Hi-therm+ is manufactured with a wider range & longer lengths.

Better Buildability

Maintenance free – No maintenance required unlike other sustainable technologies.

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


  • 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.
  • Hi-therm+ gives cost certainty with no additional costs.

Poor site Detailing

Split Lintel

  • 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.

Hi-therm gives cost certainty with no additional costs

££ – Additional costs

Cost Comparison

Hi-therm+ offers a cost effective solution to lowering carbon missions within SAP offering significant savings compared to other popular alternatives.

For example in a comparative case study for a house type, using Hi-therm would incur less than 20% of the cost of increasing the cavity width by 50mm for the same saving in Co². These Co² savings are important within SAP because they give flexibility for compliance in situations where other built details are not meeting the standards in Appendix R.