A load-bearing wall is a wall that carries and transfers structural loads from the roof, floors, or upper storeys down to the foundation. Unlike a partition wall, which only divides spaces, a load-bearing wall is an essential part of the building’s structural integrity.
Application
Identifying and understanding load-bearing walls is critical for any DIY builder — especially when planning renovations, extensions, or internal alterations. Removing or weakening a load-bearing wall without proper support can cause serious structural failure.
How to identify a load-bearing wall
- Location — Exterior walls are almost always load-bearing. Interior walls that run perpendicular to floor joists often carry loads as well.
- Thickness — Load-bearing walls are typically thicker than simple partition walls. In masonry construction, a single-leaf wall of 100 mm is usually a partition; a 200 mm or thicker wall is more likely structural.
- Foundation beneath — A load-bearing wall will have its own strip foundation or sit on a structural beam.
- Structural drawings — The most reliable method is checking the original building plans, which mark structural walls clearly.
What happens when you need to remove one
If your renovation requires opening up a load-bearing wall, the load it carries must be redirected. This is typically done by installing a steel or concrete lintel (also called an RSJ or beam) above the new opening. The beam transfers the load to the walls or columns on either side.
Key steps:
- Get professional advice — A structural engineer should calculate the beam size and specify temporary supports.
- Install temporary props — Before any demolition, support the structure above with adjustable steel props and strongboys.
- Fit the beam — Place the new beam on adequate padstones or bearing plates so the load spreads into the supporting walls.
- Remove the wall — Only after the beam is properly secured and bearing the load.
Never attempt to remove a load-bearing wall without professional calculations and the correct permits.
Related terms
- Foundation
- Construction metalwork
- Building frame
- Construction method
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