Are cracks in plaster walls serious?

• <div><p>All plaster walls will crack over time due to normal house settling and expansion and contraction from temperature and moisture changes. Small, thin hairline cracks are generally not serious and are mostly a cosmetic issue. However, larger or more significant cracks can indicate structural problems.</p><p>Here's how to tell the difference:</p><ul><li><p><b>Cosmetic Cracks:</b> Cracks that are 0.5 cm (0.2 inches) or thinner are typically cosmetic.</p></li><li><p><b>Structural Cracks:</b> Cracks wider than 0.5 cm, excessive or deep cracks, multiple cracks in the same area, or cracks that span around corners can signify a structural or foundation issue. Cracks along the joints where walls meet the ceiling also warrant attention.</p></li></ul><p>For cracks wider than 0.5 cm, structural repair is needed. If a crack is 2.5 cm (1 inch) or wider, or if you notice any signs of a structural problem, it is best to contact a plaster repair professional to assess the damage.</p></div>

What is better: wet-sanding or dry-sanding?

• <div><p>Wet-sanding and dry-sanding each have pros and cons. Dry-sanding is less messy, so it’s a good option if you’re trying to minimize dust (for example, if you’re sanding an occupied home or working with particularly dry or dusty drywall mud). However, dry-sanding is quicker because you don’t have to keep rinsing a sponge or wait for it to dry before painting.</p></div>

How do I know if my plaster needs replacing?

• <div><p>Plaster that sags or bulges, shows extensive deep cracks, or is crumbling from water damage or simply time may need replacement. Plaster walls can look a little “worn” for a long time before they need replacing. The only real way to know if it needs a replacement is to hire a professional to assess the condition of the plaster.</p></div>

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Last update on June 25, 2025

Reviewed in June 2025
I recently purchased a home from someone that had used Bob Hamilton to install their furnace and air conditioner in 2023. Less than three years later, it is pouring water from condensation into my basement, my carpet has been flooded along with drywall. It appears that water is leaking back into...
Hamilton Heating, A/C, Plumbing and Electrical
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Reviewed in June 2025
Ryan Howard came out to assess our situation with water coming in the basement. He took the time to draw up a solution to fix several things. Ryan explained exactly what the process would be.
Foundation Recovery Systems
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Reviewed in May 2025
Hammer and nail replaced our front porch . It was done in no time . Fastest worker I have seen. Done with precision and even worked around plants, shrubs and flowers I wanted to save. I also hired them for a bathroom tiling project. It was finished quickly and looks beautiful. I also hired them...
Hammer and Nail Construction LLC
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Reviewed in March 2025
They did great work. Called them after my water heater started leaking. They sent Justin right out and he fixed it super quick. Even disposed of the old one for me. Great company and great people!
Total Plumbing, LLC
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Reviewed in September 2023
Unfortunately I had to have my water heater replaced! I could not have picked a better team! They were extremely polite, efficient and clean! They did an outstanding job!
TAS Mechanical Services, LLC
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Reviewed in September 2023
water was backing up in basement. paid for them to snake the main. (260 for after hours and only took them 20 mins) the very next day water was still backing up and they did not honor their work. wanted us to pay them again for the same service the next day.
J J Kokesh and Son Inc
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Reviewed in February 2023
We contacted them as we were having water issues in our basement that was being caused by water from the sloping of our sidewalk and driveway. Once they finished, our basement has been dry. I would refer them to others.
Mudjackers and Concrete Repair
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Reviewed in August 2020
Quick response to my appt needs. Buddy was on time, kept very organized, replaced 2 toilets and an outdoor water faucet. Made zero messes, took all trash away, and was conscientious about going in and out. Now that weâ ve been using the new appliances, all working great. We are extremely...
Cooter's Plumbing, LLC
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Reviewed in March 2020
Jeff and his crew always exceeds our expectations. Often we have an idea of what we want but don't know exactly how to design or even start the project. I described a flowerbed to Jeff that I envisioned my wife being able to walk up to from a concrete driveway and plant some flowers in without...
A Handyman & A Greenthumb
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Reviewed in October 2019
I had water in my basement the last 4 years and I finally decided to do something about it. I interviewed 2 other companies besides F1 and I went with F1. Price was a factor and Billy, the Evaluator, did not high pressure me into making a decision that very day. They also offered a solution, in...
Foundation 1
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Plant Watering questions, answered by experts

While you can put new drywall over old drywall, it’s not always the best option. In some cases, drywalling over drywall can make it harder to find wires and pipes behind your walls and conceal more serious problems with your walls. It can also make the room smaller. On the plus side, putting drywall over drywall can improve soundproofing and insulation. Plus, it’s often less expensive than tearing down and adding new drywall.

All plaster walls will crack over time due to normal house settling and expansion and contraction from temperature and moisture changes. Small, thin hairline cracks are generally not serious and are mostly a cosmetic issue. However, larger or more significant cracks can indicate structural problems.

Here's how to tell the difference:

Cosmetic Cracks: Cracks that are 0.5 cm (0.2 inches) or thinner are typically cosmetic.
Structural Cracks: Cracks wider than 0.5 cm, excessive or deep cracks, multiple cracks in the same area, or cracks that span around corners can signify a structural or foundation issue. Cracks along the joints where walls meet the ceiling also warrant attention.

For cracks wider than 0.5 cm, structural repair is needed. If a crack is 2.5 cm (1 inch) or wider, or if you notice any signs of a structural problem, it is best to contact a plaster repair professional to assess the damage.

Wet-sanding and dry-sanding each have pros and cons. Dry-sanding is less messy, so it’s a good option if you’re trying to minimize dust (for example, if you’re sanding an occupied home or working with particularly dry or dusty drywall mud). However, dry-sanding is quicker because you don’t have to keep rinsing a sponge or wait for it to dry before painting.

You may need to replace drywall because of smoke damage. If the drywall is covered in soot, you may be able to clean it, but it will require a lot of time and effort. You could spend hours cleaning the drywall only to find there is more damage and it needs to be replaced anyway. It’s usually easier and safer to remove the smoke-damaged drywall and replace it.

Plaster that sags or bulges, shows extensive deep cracks, or is crumbling from water damage or simply time may need replacement. Plaster walls can look a little “worn” for a long time before they need replacing. The only real way to know if it needs a replacement is to hire a professional to assess the condition of the plaster.

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