• Intended use: Intended for use in cavity walls, accommodating cavity widths of 90-105mm supporting 100mm thick masonry.
• Hot-dip galvanisation: Undergoes Birtleys ‘super galv’ post-fabrication hot-dip galvanisation providing a 50% thicker finish than competing products, increasing the products lifespan.
• Weight capacity: Standard duty thickness, capable of bearing standard loads (check table below).
• Plaster key: Features plaster key indentations on the inner leaf to aid plaster adherence.
• Insulation: Comes with factory fitted insulation.
• Size range: Available from 750-3900mm.

The Birtley ST range of insulated supatherm lintels are renowned for their efficient characteristics. Designed specifically for cavity walls with a width of 90-105mm, the ST90 provides robust structural support while also focusing on heat retention. This design minimises heat loss, in turn reducing energy costs to heat your home.

Materials

Expertly crafted from S275JR steel, the Birtley ST offers exceptional strength and durability as a result of intricate crafting processes followed by Birtley’s ‘super-galv’ post-fabrication hot-dip galvanisation. The resulting zinc coating is 65µm; 50% thicker than offered by other manufacturers leaving no surface with inferior paint or corrosion protection.

Installation and usage

Used for its low U value to achieve net zero standards, the ST is designed for effortless installation. The ST90 lintels are strong but lightweight and do not require propping, significantly simplifying the installation process. For optimal stability, the lintel must be positioned on a bed of bricklaying mortar, leaving a minimum of 150mm end bearing.

Energy efficiency and sustainability

The ST90 combines advanced insulation with specialised engineering to effectively counteract thermal bridging. In order to achieve net zero standards, the ST90 is made to have a low U value, this innovative design reduces energy loss by 80% in comparison to standard cavity lintels, making buildings compliant with future regulations. By retaining more of the existing heat, the ST90 ensures superior energy efficiency and cost savings.