In older homes with plaster ceilings, movement and moisture may create cracks. Typically, plaster ceiling cracks have two causes: house settling and temperature or moisture fluctuations in an attic, which result in the expansion or contraction of framing members.Click to see full answer. Accordingly, is a crack in the ceiling anything to worry about?Cracks that occur near the edges of your ceiling are not usually an issue for concern, but those that cut through the middle of your ceiling are likely structural, and will require repair. These are both indicators of structural damage. how do you know if a ceiling crack is serious? If your cracks are larger than 1/16 inch wide, then they are a sign of structural issues. Matching vertical cracks: Matching vertical cracks are a sign of serious structural damage. They usually run across the length of a ceiling along the wall. Additionally, how do you fix a crack in the ceiling? Step 1 Superficial Drywall Ceiling Crack Repair. Use mesh tape to tape over the crack. Use either a five-in-one or a putty knife to spread the compound. After the compound has completely dried sand down any ridges that resulted from the putty knife. Prime and paint the ceiling. How much does it cost to fix a cracked ceiling?The overall average cost to repair a drywall ceiling is between $320 and $1,300. Labor for a basic ceiling patch job run at about $65 to $90 per hour. For a simple patch, materials and supplies may cost around $30, including tape, fasteners, and mud.