Drywall Cracks — When to Worry and How to Fix

Cracks in drywall are common and usually cosmetic. But some cracks can indicate structural issues. Here’s how to tell the difference.

When to Worry

Concerning cracks:

• Stair-step cracks (especially in brick or block)
• Cracks wider than 1/4 inch
• Cracks that grow over time
• Cracks with bulging or displacement
• Cracks accompanied by doors/windows that stick
• Cracks near structural elements (load-bearing walls, corners)

These may indicate foundation movement, settling, or structural problems. Get a professional inspection.

Normal cracks:

• Hairline cracks at corners (common at door/window frames)
• Seam cracks (where drywall sheets meet)
• Nail pops (circles where nails have pushed out)
• Cracks from temperature/humidity changes

These are cosmetic and normal in most homes.

Causes of Normal Cracks

• Settling: New homes settle for the first few years
• Temperature changes: Materials expand and contract
• Humidity: Drywall absorbs moisture and swells
• Poor taping: Original drywall installation wasn’t perfect
• Impact: Something hit the wall

How to Fix Cosmetic Cracks

Hairline Cracks

1. Clean the crack with a utility knife to remove loose material
2. Apply a thin coat of joint compound with a putty knife
3. Let dry completely (24 hours)
4. Sand smooth
5. Apply second coat if needed
6. Prime and paint

Wider Cracks

1. Open the crack slightly with a utility knife (creates better adhesion)
2. Apply mesh drywall tape over the crack
3. Cover tape with joint compound
4. Feather out 6-8 inches on each side
5. Let dry, sand, repeat for 2-3 coats
6. Prime and paint

Nail Pops

1. Drive a new drywall screw 1-2 inches above or below the pop
2. Drive the popped nail back in or remove it
3. Cover both with joint compound
4. Sand, prime, paint

Preventing Future Cracks

• Maintain consistent indoor humidity (30-50%)
• Allow new homes to settle before extensive repairs
• Use flexible caulk where walls meet ceilings (instead of rigid joint compound)
• Address any water intrusion issues promptly

When to Call a Pro

• Cracks show signs of structural movement
• You want a perfect repair (drywall finishing is a skill)
• Cracks are in textured ceilings (matching texture is difficult)
• Extensive cracking throughout the house

The Bottom Line

Most drywall cracks are cosmetic — houses move, materials shift, and imperfect taping shows over time. Fix them with joint compound and tape. But if cracks are large, growing, or accompanied by other signs of movement, get a structural inspection before patching.