| Crack Type | Recommended Action | |------------|--------------------| | Hairline (<1mm) | Clean, widen slightly with a scraper, fill with flexible spackle or joint compound, sand, and repaint. | | 1–3mm, stable | Rake out loose plaster, apply mesh tape over the crack, then use a setting-type joint compound or lime-based plaster. | | >3mm or recurrent | Investigate underlying cause: check window seals, lintel, and structural movement. Fill with bonding agent and repair mortar. | | Active / growing | Do not just patch. Consult a structural engineer or qualified contractor to assess foundation or wall movement. |
Before we dive into the repair process, it's essential to understand the causes of cracks in plaster around windows. Some common causes include: cracks in plaster around windows