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Lintels

Lintel Sizes, Spans and Load Ratings

Castings Drainage has lintels for sale from Naylor and IG, for openings in cavity, solid and internal walls.

A lintel carries the load above a door or window across the opening and into the masonry either side, preventing cracking and settlement in the brickwork above. The range takes in Naylor concrete lintels in 100mm and 140mm widths and IG galvanised steel lintels for 90 to 105mm and 150 to 165mm cavities, in lengths from 600mm to 4800mm.

Naylor Concrete Lintel Sizes and Loads

Model Size Lengths Weight Unfactored load at 700mm clear span
ER2 100 x 140mm 900 to 2400mm 34kg/m Up to 35.30kN/m
ER7 100 x 215mm 900 to 2400mm 54kg/m Up to 64.47kN/m
R6 High Spec 100 x 140mm 1050 to 1800mm 34kg/m Contact us
R9 High Spec 100 x 215mm 900 to 3000mm 52kg/m Contact us
S4 High Spec 100 x 100mm 1200 to 2400mm 23kg/m 15.77kN/m

ER1 100 x 65mm, ER3 140 x 65mm, ER6 140 x 140mm and ER8 140 x 215mm complete the Economy Range, with the R7 100 x 215mm and R8 140 x 215mm in the High Spec Range. The ER2, ER7 and S4 are rated for foundation use and carry 30 minutes fire resistance.

IG Steel Lintel Sizes and Loads

Model Cavity width Lengths Load capacity
L1/S100 90 to 105mm 900 to 4800mm Up to 27kN (3:1) and 22kN (19:1)
L1/S150 150 to 165mm 900 to 3000mm Up to 26kN (3:1) and 20kN (19:1)
L1/HD100 90 to 105mm 1500 to 3000mm Up to 40kN (3:1) and 35kN (19:1)
L1/HD150 150 to 165mm 1500 to 2400mm Up to 35kN (3:1) and 30kN (19:1)
Box 200 Single leaf and solid wall 1500 to 4800mm 15 to 35kN UDL by model

The IG Box 100 covers standard load brickwork and blockwork openings, and the IG L10 is a single leaf lintel for supporting the outer leaf of a cavity wall, available without a top bend where the build needs it.

Choosing Between Steel and Concrete Lintels

For a cavity wall, use an IG L1 lintel matched to the cavity width. The L1/S range covers standard loads and the L1/HD range takes heavier loads across the same two cavity widths. Where only the outer leaf needs support, the L10 does that job on its own.

For a solid wall, an internal opening or an inner leaf, choose a Naylor concrete lintel or an IG Box lintel. Concrete suits plastered internal openings and foundation work. Steel is lighter to handle and faster to bed on site over the same span.

Match the load rather than the size. At 100 x 215mm the ER7 carries up to 64.47kN/m at 700mm clear span, while the 100 x 100mm S4 carries 15.77kN/m over the same span.

Applications

Window and door openings in new build housing, domestic extensions, internal partitions and foundation work. The Economy Range suits standard housing openings, while the High Spec and IG heavy duty ranges are specified where spans are longer or loads are higher.

Explore More

Browse the full concrete lintels range for Naylor Economy and High Spec models, or the steel lintels range for IG cavity, heavy duty and box lintels.

Contact Us

Not sure which lintel suits your opening? Get in touch with the team for technical advice and UK wide supply.

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