Stressline Lintels

Why Choose Stressline Lintels?

Stressline is one of the UK’s leading independent lintel manufacturers, supplying structural products designed for modern construction and renovation projects alike. Their range covers standard duty and heavy-duty applications, with solutions for external cavity walls, internal load-bearing walls, timber frame construction and bespoke structural requirements.

As one of the few manufacturers producing both steel lintels and concrete lintels, Stressline offer strong technical consistency across a wide range of building applications. Their products are manufactured under strict quality control and comply with relevant British Standards, helping builders and developers meet specification requirements with confidence.

Built for Strength and Longer Spans

One of the main reasons Stressline remains a popular choice is simple: strength.

Stressline lintels are designed to support a wide variety of structural loads, including:

• Masonry loads
• Distributed timber floor loads
• Uniformly distributed roof loads
• Concrete floor loads
• Load-bearing walls
• External cavity walls
• Internal partitions
• Attic truss floor loads

The strength of these products often allows for longer span distances, reducing structural limitations and giving greater flexibility on site. This is particularly useful for larger openings such as wide windows, bifold doors, garage openings and modern extension work. If you want to understand loading in more detail, our guide on how much weight a steel lintel can support explains the key factors involved.

Choosing the Right Stressline Lintel

When selecting a lintel, the three main things to check are:

• Wall construction
• Structural opening size
• Lintel load requirements

If you are unsure, always refer to the manufacturer’s load span tables or speak to our technical team before ordering.

Popular Stressline Cavity Wall Lintels

Stressline cavity wall lintels are among the most commonly specified products in the range, particularly for standard UK housing and extension work.

Available for 50mm, 75mm, 90mm, 100mm, 125mm and 150mm cavities, these galvanised steel lintels are designed to fit neatly within modern insulated cavity wall construction while providing dependable structural support. If you are comparing cavity construction requirements, our guides on what a cavity wall lintel is and cavity wall insulation can help explain how these systems work together.

The best-selling Stressline SL90 cavity wall lintel remains a popular option for standard masonry loads, distributed timber floor loads and uniformly distributed roof loads. It is widely used above doors and windows where dependable performance and straightforward installation are essential.

Wide Range of Lintel Types

Stressline offer a broad range of lintel profiles to suit different building methods and loading requirements, including cavity wall lintels, single leaf lintels, double skin box lintels, angle lintels, timber frame lintels, heavy-duty lintels and steel lintels for larger structural applications.

This wide product choice means there is usually a suitable solution whether you are working on a new build, extension, renovation or commercial development. If you are new to lintel selection, our guide on what a lintel beam is provides a useful starting point.

Technical Support and Load Span Tables

Selecting the correct lintel is not just about matching the opening width. Bearing requirements, cavity size, load conditions and wall construction all affect the correct specification.

Stressline provide comprehensive load span tables and technical reference guides to help with lintel selection, and our team can help you identify the right product for your project.

For broader advice across all lintel types, visit our main Complete Guide to Lintels in the UK or browse our full Lintels Collection.

Important

Lintels should always be selected based on structural requirements, not just opening size alone. Building Control will expect the correct specification for the load being supported, so if there is any uncertainty, structural advice should be taken before installation.

Click & Collect and Nationwide Supply

We stock a wide range of Stressline lintels for fast collection and nationwide supply. Whether you need a single replacement lintel or bulk quantities for larger projects, we can help with stocked sizes, technical support and practical advice on product selection.

Wade Building Supplies also supply leading brands across our wider lintels range, helping builders and contractors source the right solution for every project, whatever the specification.