Usually the seams are invisible due to the use of drywall mud and tape.
Cracks in drywall seams after attic.
This occurs because there is a joint which gets drywall taped and then layered with two or three coats of drywall mud.
One reason drywall cracks is because the wrong type of drywall mud was used when taping the seams.
And if the tape has pulled loose from the wall surface.
Some drywall mud has more adhering ability and should be used when taping drywall whereas other types of drywall mud should only be used in finishing.
Here s how to go about it.
The mud fills in the seam and the tape covers it.
Framing flexing drywall cracks.
Start by roughing up the painted surface with sandpaper then wipe it down with a damp rag to remove any dust.
Some drywall mud products are intended only for second or third coats.
Most drywall cracks occur on the seams where two pieces of drywall meet.
If the crack is on a vertical or horizontal seam carefully widen the crack with the corner of a paint scraper utility knife or chisel to determine if the crack extends completely through the paper that is covering the seam image 1.
Next apply a thin coat of drywall joint compound to the.
Additionally drywall cracks are often found where two pieces of drywall are butted together.
If the drywall isn t firmly attached drive drywall screws into the framing on both sides of the crack.
Those fissures in your wall have several possible causes.
In interior ceilings or cathedral ceilings not framed to modern construction standards for stiffness we may see cracks often at drywall joints caused by flexing in the ceiling structure.
Water leaking from a window or the roof or even a leaky attic water line can run down inside a wall s framing and saturate the drywall which then softens and deteriorates creating a crack with.