Render cracking is one of the most common issues homeowners face with external walls. While hairline cracks are often cosmetic, larger cracks can indicate structural movement or water ingress problems that need prompt attention.

Common Causes of Render Cracks

• Thermal Movement: Render expands and contracts with temperature changes, which can cause fine cracks over time.
• Substrate Movement: If the underlying wall moves due to settlement or subsidence, the render will crack.
• Incorrect Application: Render applied too thickly, in the wrong conditions, or without proper preparation is prone to failure.
• Impact Damage: Accidental knocks from ladders, vehicles, or garden equipment.

When to Act

Hairline cracks under 1mm are generally cosmetic. However, cracks wider than 2mm, cracks that follow a stepped pattern along mortar joints, or cracks accompanied by bulging render all warrant professional assessment.

Professional Repair Options

Depending on the severity, repairs range from filling and recoating small areas to removing and re-rendering entire sections. At Young’s Construction, we assess the root cause before recommending a solution, ensuring a lasting repair rather than a temporary fix.