A concrete lintel usually requires a minimum end bearing of 150mm on each side of the opening. This ensures the weight is safely transferred to the supporting masonry without causing structural damage.
Concrete Lintels for Structural Support
Our range of concrete lintels provides essential structural support above windows, doors, and other structural openings. These precast load-bearing beams are designed to safely span gaps in masonry walls, transferring the weight of the structure above down to the surrounding masonry. They are widely used in both residential and commercial construction, offering a robust solution for internal blockwork, external cavity walls, and general masonry applications.
Made using precast concrete and reinforced with internal steel bars, these lintels meet strict British Standards for load-bearing applications. Their solid composition offers reliable fire resistance and acoustic insulation, making them suitable for separating walls or areas requiring enhanced structural stability. When installing these supports, it is crucial to embed them on a solid, level mortar bed using a suitable mix of cement and sand to ensure even weight distribution, typically requiring a minimum 150mm end bearing. In many heavy-duty scenarios, the ends of the lintel will sit directly onto padstones to prevent the underlying blockwork from crushing under concentrated loads.
These structural supports are versatile and offer durability against moisture and rot, ensuring long-term compliance with building regulations. They can be handled straightforwardly on-site, though heavier lengths often require mechanical lifting. To prevent moisture ingress in cavity wall applications, they are typically installed alongside damp proof membranes to direct water away from the inner leaf and keep the surrounding structure dry. While concrete options provide strong fire ratings and density, projects requiring longer spans with a slimmer profile might require steel lintels, which serve a similar purpose but accommodate different architectural requirements within your wider supply of building materials.
Concrete Lintel FAQ's
You will need to measure the width of your opening and add at least 300mm to allow for a 150mm overlap on both sides. You must also consider the load the lintel needs to carry, including the masonry above and any floor or roof loads.
It is highly recommended not to cut prestressed concrete lintels. Cutting them can expose the internal steel reinforcement to moisture, leading to rust and structural failure. It is always safer to order the exact length required for your project.
Yes, installing a flexible damp proof course over the lintel is essential in external cavity walls. This practice stops moisture from penetrating the inner wall and directs any water safely out through weep holes in the brickwork.
While concrete lintels are rigid, they may still need temporary propping during installation until the mortar bed has fully cured. This is especially important for wider spans to prevent the lintel from sagging under the immediate weight of fresh masonry.