Precast concrete lintels to BS5977-2

Stowell Concrete manufacture a concrete lintel system of the highest quality. The pre-stressed concrete lintels are attractively textured to accept all kinds of applied finish and are easily handled. The system provides an economic and convenient form of construction, having many advantages over comparable lintel systems with its ease of installation.

COMPOSITE LINTELS

These lintels utilise the composite action of the concrete and brick/blockwork together to provide their load-bearing capacities as shown in the table overleaf.

A strong mortar mix of 3 parts sand to 1 part cement is recommended with brick reinforcing fully interleaving each course. Three courses of brickwork are equivalent to two courses of blockwork. As the brickwork mortar matures, lintels of over 1200mm spans should be propped at 1200mm centres. Bearings at each end must be at least 150mm and for lintels of over 3 metres, longer bearings are recommended. A damp proof course, when used, must be strong and plastic enough to avoid cracking and be placed so as not to break the lintel/blockwork bond. Ideally the d.p.c. should not be included in the composite wall joist at all, but if essential then it should be only tucked in 30mm.

NON COMPOSITE LINTELS

Where a higher load bearing capacity is required or there is insufficient brickwork above to allow adequate composite action non-composite lintels are the solution.
No propping is necessary during construction and also wall plates, trusses and floor joists can be accommodated as directly imposed load in accordance with the table overleaf. Bearings at each end must be at least 150mm and for lintels of over 3 metres, longer bearings are recommended.

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All products are available ex works.
Prices on application.
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The table above is for safe working, uniformly distributed loads applied to the composite construction in kg/metre run of span exclusive of self weight of brickwork within the construction, but including the weight of the lintel. The design is based on the brickwork having a limiting crushing strength of 10.4 N/mm².

The table above is for safe working, uniformly distributed loads applied to the non-composite lintels in kg/metre run of span inclusive of the weight of the lintel.