Description

• Intended Use: Designed specifically for cavity walls, accommodates cavity widths of 70-85mm and supports 100mm thick masonry.
• Hot-Dip Galvanised Post-Fabrication: This lintel undergoes a post-fabrication hot-dip galvanization process, receiving up to 50% more zinc than typical coatings, significantly boosting its resistance to corrosion.
• Weight Capacity: Suitable for typical construction demands (check table below).
• Thermal Efficiency: This lintel features factory-fitted insulation, which reduces thermal bridging and enhances overall thermal performance. The insulation specifically earns a BREEAM rating of A+ for energy efficiency.
• Fire Safety: This lintel provides a fire resistance of 60 minutes when finished with a two-coat plaster, ensuring both safety and regulatory compliance.
• Plaster Key: The internal leaf features indentations designed to enhance plaster adhesion to the steel surface.
• Size Range: Available from 750mm to 3900mm.

Not suitable for concrete floors or point loads

The Birtley CB range are standard duty steel lintels designed specifically for cavity walls with a width of 70-85mm, providing robust support for both the inner and outer leafs of masonry. It is widely regarded for its durability and structural integrity.

Materials

Manufactured from structural grade mild steel S275JR and coated with a hot-dip galvanization process post-fabrication, the CB90 offers exceptional zinc protection that surpasses many other lintels in its class. This method ensures a coating thickness of approximately 65µm, significantly enhancing its corrosion resistance and longevity.

Installation and Usage

Designed for ease of installation these lintels are light and workable ensuring an easier fitting process. This lintel must be fully bedded on bricklaying mortar and installed with a cavity tray. The minimum end bearing required is 150mm, ensuring stability and alignment during and after installation.

Energy efficiency and sustainability

Insulation, combined with specialised engineering works to maintain consistent indoor temperatures and minimises thermal bridging, thus enhancing buildings energy efficiency. Featuring an internal plaster key, it ensures a smooth finish and integrates seamlessly with different architectural styles, simplifying the installation process.

Fire Performance

When looking for fire resistant lintels, Birtleys cavity wall range is a good pick, offering 60 minutes of fire resistance with 2 coats of plaster, ensuring buildings are compliant with current standards and building codes.

With lengths ranging from 750mm to 3900mm, Birtley Steel Lintels offer flexibility for various project specifications, making them a practical choice for cavity wall support. With all types of load bearing lintels in their catalogue, made from galvanised steel, Birtley Lintels are tailored to provide corrosion resistant structural support for every need.