![]() Paint over the area that has been patched with a coat of paint or primer before retouching any other cracks in your ceiling.Allow it to dry for 30-45 minutes and then sand with fine grit sandpaper until smooth.Apply the putty over the crack, then smooth it out until it is even with the surface, then let it dry completely.Fill in the cracks by Applying a thin coat of plaster patching compound over the crack, using a putty knife or trowel/.Mix a small amount of plaster to create a putty-like consistency.Use a putty knife to remove the loose plaster.Repairing Hairline Cracks in Plaster Ceiling This can be a common source for hairline cracks in plaster ceiling. When wood beams expand and contract because of changes in temperature and moisture, they can cause constant shifting of the structure causing the walls or ceilings to shift slightly.The weight of an object is not usually enough to cause hairline cracks in plaster ceiling, but heavy and repeated use can eventually cause the surface to crack. Heavy objects placed on plaster ceiling can cause hairline cracks in plaster ceiling.Moisture from rain, snow or dew entering your house via attic holes, windows and faulty roofing is a common source of hairline cracks in plaster ceiling. Damage from water can cause hairline cracks in plaster ceiling.Hairline cracks in plaster ceiling over window frames are common for this reason and are repaired fairly easily. Other major factors that can cause cracks is dry wall from lack of paint, moisture or other reasons for surface to fall apart along the surface of the plaster.Hairline cracks in plaster ceiling occur when the wall moves slightly because of small changes in humidity levels or different temperatures at various times of the year can cause hairline cracks to appear over time.Hairline cracks in plaster ceilings are caused by earthquakes, foundation movement, atmospheric changes or other factors that can affect a plaster surface that is susceptible to cracking if it isn’t properly maintained. Plaster is dry-wall, plaster or gypsum applied to the surface of walls and ceilings.Causes of Hairline Cracks in Plaster Ceiling ![]() ![]() In the event of mechanical stress, it is important to determine whether or not the hairline cracks are a result of expansion and contraction or due to the stress being transferred through plumbing work. It is important to determine the root cause of the hairline cracks in plaster ceilings before undertaking any repairs. The most common cause of hairline cracks in plaster ceilings are due to mechanical stress exerted through expansion and contraction of the building with changes in temperature. Hairline cracks in plaster ceilings could be due to temperature changes in the room, plumbing under the ceiling, or even changes in the building itself. ![]()
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