How to Repair Wall Cracks? A Step-by-Step Guide

Wall Crack Repair

Beyond causing aesthetic concern, wall cracks can in some cases be a sign of structural problems. Choosing the correct diagnosis and appropriate repair method is critically important.

Types of Cracks

Hairline cracks: These form during the natural drying of the plaster or seasonal expansion-contraction; they are usually superficial and can be repaired easily.

Structural cracks: Cracks wider than 3 mm, diagonal or in a staircase shape are a sign of a foundation or load-bearing element problem; they require expert intervention.

Materials

• Filler or satin plaster
• Acrylic filler for deep cracks
• Reinforcing tape or scrim tape (to prevent re-cracking)
• Spatula, sandpaper

Application

The crack is widened and the dust and paint inside are cleaned out. Filler is applied to the moistened surface. After drying it is sanded. If necessary a second coat is applied. Finally, paint is applied after priming.