Small cracks can be repaired by applying plaster.
What causes cracks in drywall ceiling.
When the ceiling joist or trusses are undersized for the drywall ceiling weight that they re carrying.
Typically plaster ceiling cracks have two causes.
This is a sign of structural damage usually related to a weak wall.
The best way to repair a crack in drywall is to re tape the joint.
If you find cracks in these areas beery recommends another test.
Ceiling cracks in plaster ceilings.
These structural members sit on top of the wall plates and are often connected to the plates with nails.
Drywall cracks in ceilings or walls.
If you live in a home with plaster ceilings and you begin to see cracks they may be caused by moisture and or movement.
Damaged ceiling joist or trusses.
Cracks in a drywall ceiling are caused by wood movement in the framing due to shrinkage of improperly dried lumber or seasonal changes in temperature and humidity.
Illustrations show where cracks are most likely to appear explain why and suggest both repair approaches to drywall cracks and how to prevent cracking in plasterboard or gypsum board.
A wall is constructed with vertical studs that extend from floor to ceiling.
If they are bigger and sections of plaster are falling you will probably have to remove the plaster and replace it with a drywall section.
House settling and temperature or moisture fluctuations in an attic which result in the expansion or contraction of framing members.
Causes of cracks in walls.
One of the most common causes of cracks in drywall ceilings is related to the roof trusses.
Too much mud too little mud missing drywall tape and drywall secured with internal stresses are some causes removal of pop corn textured or cottage cheese looking ceiling material may leave a drywall taping job that tends to crack at the drywall joint.
See if the door or window.
Cracks that cause concern are those which run across the length of a ceiling and then continue down a wall along the same line.
When the wood rafters expand and contract naturally with changing temperature and humidity it pulls the ceiling joists away from the wall plates.
Then sagging may result and the stress from this may create cracks.
Occasionally a ceiling joist or a truss becomes damaged or cracked this weakens the framing member and the ceiling will bow or sag in.
