Why does plaster crack around windows?

Asked By: Iacob Coleman | Last Updated: 5th January, 2020
Category: home and garden interior decorating
4.5/5 (571 Views . 12 Votes)
It's no big deal -- just stress cracks in the plaster that form your house settles, or when the humidity and heat cause the wood to expand and contract. This causes the plaster in the lower right and lower left corners of your windows to crack and shoot the crack downward.

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In respect to this, are cracks around windows normal?

A: Wall cracks are fairly common in both new and older homes and are often the result of normal house “settling” that can quickly, inexpensively be remedied by re-taping the joints—the seams where the drywall panels meet.

One may also ask, how do you fix plaster around a window? Choose plaster patching compound, which is available in most home improvement centers.

  1. Pry off the trim molding around the window with the flat edge of a pry bar.
  2. Pull the nails from the molding with a nail puller or pliers.

In this way, what causes plaster to crack?

Some common causes of wall cracks include: Humidity – Wood frames in most older homes expand and contract when the humidity rises and falls. This in turn puts stress on the plaster or drywall in front of it. The stress levels of your interior walls eventually lead to cracking.

When should I be concerned about plaster cracks?

Other cracks can appear from settlement and are often seen in new build properties, or where a new extension has been built. Cracks can appear between the ceiling and wall or around doors and windows.

The main time you need to worry about cracks is:

  1. They appear.
  2. You fill or plaster over them.
  3. They come back.

34 Related Question Answers Found

How can you tell if a crack is structural?

These cracks are usually accompanied by other signs of foundation issues such as sticking doors and windows, slanted doors, sloping floors and cracks in porches. The common characteristics structural cracks include: Continuous horizontal cracks along walls. Vertical cracks that are wider at the top or bottom.

Do cracks in walls indicate a structural problem?

Most small cracks in drywall or plaster walls are not serious and are caused by seasonal expansion and contraction of the wood framing in your house over time. Larger cracks in your walls, however, can indicate structural or foundation problems.

How do you stop plaster walls from cracking?

You should not use sand that lacks fine material and if it does then you should add some lime into the cement. However, one sure way to prevent shrinkage cracks particularly is with the use of fibres in the mix, which will take some of the force of the movement through the material.

How do you stop walls from cracking?

Tip: Use expansion joints to separate adjacent brick walls of different heights to avoid cracking caused by differential movement. The joint can be placed at the interior corner or, if appropriate, a foot or so away from the corner to provide a masonry bonded corner for stability.

Is it normal for plaster to crack?


Plaster cracks are generally cosmetic and will not cause future problems if not addressed. But unkeyed plaster is a problem that just gets worse and damages more and more of the surrounding plaster until it has broken so many keys that the plaster just falls to the floor.

Why do hairline cracks appear in old plaster?

The movement of contraction and expansion can cause hairline cracks to appear. Low quality paint: Inferior quality paint results in poor paint adhesion on your wall, which leads to cracks over time. Not letting cement plaster completely dry before applying paint is actually quite a common factor attributed to cracks.

At what temperature does plaster crack?

At 32 degrees Fahrenheit (0 degrees Celsius) and below plaster will freeze on the wall and cause weakening of the plaster. Damage to the plaster can be so severe that you can rub it off the wall by using your hand.

How do you fix deep cracks in plaster walls?

How to repair cracks and holes in plaster. You can fill a deep crack with screwed-up newspaper, which makes a good base for the filler. For larger holes, you might need to build up several thin coats of filler rather than one thick one, making sure to let each coat dry before adding the next.

Does plaster crack with age?

Cracked Plaster
Sometimes they are a warning sign, but other times they're just like wrinkles on our faces that appear with age. Delaminating Cracks – These cracks are a sign of plaster pulling away from the lath behind it. These show up on both ceilings and walls, but can be the most dangerous on ceilings.

How do you get plaster off a window frame?


Use a sturdy straight edge as a guide and score the line with a suitable Stanley knife or similar. Then, gently tap all around, on the inside of the marked line, so as to shatter and loosen the plaster off the frame. Slowly and steadily, the plaster can be removed.

How do you fix drywall around windows?

Apply a thin coat of joint compound around the joint surrounding the drywall patch. Cut and place a piece of joint tape over each joint. Apply another thin layer of joint compound. Allow the compound to dry for 24 hours, then lightly sand it until it is smooth.

How do you repair plaster walls?

Repair Holes
  1. Step 1: Remove Damaged Plaster. Remove the damaged plaster by using a cold chisel and a ball peen hammer to chip the damaged plaster off the wall.
  2. Step 2: Apply Latex Bonding Agent.
  3. Step 3: Apply and Cross-Scratch Plaster.
  4. Step 4: Apply Second Layer.
  5. Step 5: Apply layer of Joint Compound.

What is patching plaster?

It gives your walls a smooth facade and improves the strength and stability of your walls. Without plaster, you would have rough walls that are difficult to paint or wallpaper. Whether it's a crack, crumbling plaster, or even water damage, patching your plaster is a sure way to return your wall to a pristine state.

What is a window reveal?

The Reveal is a timber surround fitted to the fin of the window or door and used for installing the product into timber framing. The reveal becomes the frame of your window or door covering the stud.

How do I fill a gap between lintel and window?


If you have very large gaps around a window, you can fill them using expanding foam. Expanding foam is perfect for filling large gaps around windows as it allows for a degree of movement without cracking or breaking. It can also provide a good moisture barrier between the brickwork and the window frame.

Should I be worried about hairline cracks in plaster?

Vertical and horizontal cracks in drywall or plaster walls typically indicate drying and shrinkage, which is normal after construction. Jagged cracks, stair-step cracks and 45-degree angle cracks generally signify structural movement or settling issues that are occasionally serious but usually harmless.

Is blown plaster caused by damp?

Yes, it could certainly contribute that kind of damp mouldy whiff. But I would imagine that the 'blown' plaster isn't the cause of the damp or coldness, but rather that the plaster has been blown off by penetrating or rising damp from the wall behind.