What a lintel does
Every opening in a wall, whether a window, door or archway, needs something to carry the masonry above it. That is the lintel. Over time lintels made of different materials fail in different ways, and a failed lintel can put the wall above at risk.
Common types and problems
- Timber lintels, common in older properties, can rot or be attacked by insects when damp gets in
- Stone lintels can crack or weather, particularly in exposed locations
- Steel lintels and angle irons corrode, and the rust expands, pushing brickwork apart
- Early concrete lintels may contain corroding reinforcement that causes the concrete to crack and spall
Signs to look for
Cracks running diagonally from the corners of an opening, a sagging line of brickwork above a window, rust staining, flaking concrete or doors and windows that have become tight or stuck can all point to a lintel problem. Properties near the coast, such as those around Tynemouth and Cullercoats, are more exposed to moisture and salt, which can speed up corrosion.
How we replace a lintel
Replacing a lintel is a structural job and needs proper support while it is done. In outline, the wall above is held with needles and props, the failed lintel is removed, a new lintel of suitable size and type is bedded on sound bearings, and the brickwork is made good. The right replacement depends on the load and wall type. Modern galvanised or stainless lintels are common, while heritage buildings may call for stone or other sympathetic solutions. We are careful about bearings, because a lintel resting on weak masonry will not perform properly.
Where a lintel is only partly damaged, repair may be possible. This might mean treating and encasing the steel, or replacing a section of damaged brickwork. If the opening is being widened as well, that is a bigger alteration; see old doorway and window opening alterations and structural steel beam installation.
Regulations
Replacing a lintel can be notifiable under Building Regulations. Details are on GOV.UK, and we can talk through what is likely to be needed for your property.
Frequently asked questions
Can a lintel be repaired rather than replaced?
Sometimes. If the damage is limited, the lintel may be treated or supported. Heavily corroded, rotten or cracked lintels are generally replaced. We assess the condition and the load above before recommending either.
Will the wall above need rebuilding?
Not usually. The wall is temporarily supported while the lintel is swapped. Damaged brickwork directly above or beside the opening may need local repair, and that is made good as part of the job.
