As temperatures drop and wetter weather arrives, it's worth checking your home's exterior walls for cracks and damage.

Small cracks can sometimes be repaired with a suitable exterior filler, helping to prevent water getting into damaged areas. However, it's important to identify the cause before starting any repairs.

What Causes Cracks in Exterior Walls?

Cracks can develop for several reasons, including:

• Natural movement in building materials

• Temperature changes

• Ageing or damaged render and mortar

• Moisture and weather exposure

Not every crack is simply cosmetic. Large, widening or recurring cracks, particularly around doors and windows, may indicate movement that needs professional assessment.

Can You Fill Exterior Wall Cracks Yourself?

Small, stable, non-structural cracks can often be repaired using a suitable exterior filler.

The right product depends on the surface, crack size and whether the area is likely to experience movement.

For brickwork, render or masonry, check that the filler is specifically suitable for the material and exterior exposure.

How to Fill Cracks in Exterior Walls

1. Check the crack

Inspect the size and condition of the crack. If it is widening, recurring or showing signs of structural movement, seek professional advice before repairing it.

2. Prepare the surface

Remove loose material, dirt and dust. Make sure the surface meets the filler's preparation requirements.

3. Apply the filler

Use a suitable exterior filler, following the manufacturer's instructions for application depth and joint preparation.

4. Allow it to dry

Drying times vary depending on the product, repair depth and weather conditions.

5. Finish the repair

Once ready, sand or finish the surface if required. Use a compatible exterior coating where necessary.

When Is the Best Time to Repair Exterior Cracks?

Autumn can be a good opportunity to inspect exterior walls before winter.

However, avoid applying fillers in unsuitable conditions. Cold temperatures, rain and damp surfaces can affect some products.

Always check the manufacturer's recommended application temperature and weather requirements.

Choose the Right Exterior Filler

Whether you're repairing minor cracks in render or filling small holes in masonry, choosing a product designed for exterior use is important.

Explore exterior fillers at Silicone Direct to find a suitable option for your next repair.

Remember: Repairing a crack is only worthwhile once you've identified why it appeared. If the underlying cause remains, the crack may return.