Hi-Therm Lintels

Traditional steel lintels create a thermal bridge because steel readily transfers heat through the building envelope.

Hi-Therm+ overcomes this with a patented hybrid design that combines galvanised steel, a rigid polymer thermal isolator and integrated insulation within a single factory-manufactured lintel.

By separating the inner and outer steel sections, the patented polymer thermal isolator interrupts the thermal path through the lintel, while the integrated insulation further enhances thermal continuity across the cavity.

Together, these three components are the Genius Inside Hi-Therm+, delivering exceptional thermal efficiency while maintaining the structural performance, simplicity and buildability of a one-piece steel lintel.

Key Components

• Integrated insulation – Pre-fitted expanded polystyrene (EPS) insulation improves thermal continuity across the cavity and helps minimise heat loss.
• Polymer thermal isolator – A patented rigid polymer thermal isolator separates the inner and outer steel sections, creating an effective thermal break that significantly reduces thermal bridging.
• Galvanised steel structure – High-strength galvanised steel provides the strength, durability and structural performance expected from a Keystone steel lintel.

A proven solution to thermal bridging

Thermal bridging at junctions can have a significant impact on the energy performance of modern buildings.

In well-insulated homes, up to 30% of heat loss can occur through non-repeating thermal bridges, such as window and door openings.

Hi-therm+ lintels are engineered to dramatically reduce this effect.

With Psi values as low as 0.03 – 0.06 W/mK, Hi-therm+ lintels meet the Appendix R values required within SAP calculations, supporting compliance with Building Regulations Part L.

They can also improve junction Psi values by up to 15%, helping designers achieve fabric energy efficiency targets through a fabric-first approach.

By reducing thermal bridging at openings, Hi-therm+ lintels allow housebuilders to meet performance targets without relying on more expensive design changes.

Specification Benefits

• Helps improve SAP calculations
• Supports fabric-first compliance strategies
• Reduces carbon emissions through better fabric performance
• Future-ready for evolving building regulations

Hi-therm+ lintels are engineered to deliver high thermal performance while maintaining simple installation on site.

The one-piece lintel design installs in the same way as a traditional steel lintel and requires no specialist equipment or skills.

Unlike split lintel systems that require multiple components and additional detailing, the Hi-therm+ design simplifies installation and improves stability during the build process.

The structurally superior top-hat design provides inherent stability between the internal and external leaves, helping ensure consistent build quality and faster installation.

Because Hi-therm+ works with standard construction methods, builders can benefit from improved thermal performance without changing existing work practices.

Key Advantages

• Installs like a traditional steel lintel
• No specialist tools or skills required
• One-piece design simplifies installation
• Faster installation compared with split lintel systems
• Consistent build quality and reduced site detailing