What Causes Cracks Above Windows in Brick Walls?
Cracks appearing above windows are one of the most common warning signs homeowners notice in brick walls. While some cracks may look minor at first, they often indicate movement within the structure that should not be ignored.
In many Perth homes, cracks above windows develop gradually over time as pressure builds within the wall around the opening. Identifying the cause early helps prevent further movement and more extensive structural repairs later.
What Causes Cracks Above Windows?
One of the most common causes is rust within the steel lintel supporting the brickwork above the window.
Lintels carry the weight of the wall above openings such as windows and doors. Over time, moisture exposure can cause steel lintels to rust and expand. As the steel expands, pressure builds within the surrounding brickwork and cracks form through the bricks and joints.
Other contributing causes may include:
- foundation movement
- ageing mortar joints
- long-term moisture exposure
- seasonal soil movement
- vibration or structural settlement
Cracks above windows are often more than surface damage and should be inspected properly before repairs are carried out.
Are Cracks Above Windows Serious?
Some common warning signs include:
- stepped cracking through mortar joints
- horizontal cracking above windows
- widening gaps over time
- rust staining near openings
- bricks shifting or separating
These signs can indicate movement inside the wall rather than simple cosmetic cracking.
How Are Cracks Above Windows Repaired?
The correct repair method depends on what is causing the movement.
Repairs may involve:
- replacing rusted steel lintels
- stabilising surrounding brickwork
- repointing weakened mortar joints
- rebuilding damaged brick sections
- restoring cracked render or plaster finishes
- Inserting steel rods to support and stabilise the wall
At Federation Tuckpointing®, repairs focus on identifying and resolving the cause of movement rather than simply patching visible cracks.
Matching the existing brickwork and mortar carefully also ensures repairs blend naturally with the original wall.
Will the Crack Get Worse Over Time?
Small cracks can gradually worsen if the underlying movement continues.
Early inspection helps:
- prevent further structural damage
- reduce repair costs
- stop moisture entering the wall
- protect surrounding brickwork
In many cases, identifying the issue early prevents larger sections of wall requiring reconstruction later.
Cracked Wall Repairs Across Perth
Federation Tuckpointing® provides cracked wall repairs, lintel replacement and structural brick repair services across Perth and surrounding areas.
If you’ve noticed cracks forming above windows or doors, arranging an inspection early helps determine the correct repair method before further movement occurs.
At Federation Tuckpointing®, our process, safe methods, and 10-year workmanship guarantee give you confidence that your home is repaired properly the first time. Book a professional inspection today and get the right advice for your property.
