Fixing Plaster Wall Cracks? Causes and Solutions

Why Do Plaster Walls Crack?

Figuring out what’s behind them is the first step to fixing the cracked plaster walls properly. Let’s break it down:

Structural Issues

If you notice cracks around doors or windows, it could mean there’s a problem with the lintel (the support above them). This may indicate larger structural issues, so don’t delay. Get a structural engineer or look for the best ways of fixing plaster wall cracks.

Subsidence

Subsidence happens when the ground underneath your house sinks. This can be caused by things like leaking pipes, dry weather, or tree roots soaking up the soil’s moisture. It can lead to major cracks, so you’ll want to call in the experts to investigate and stop further damage.

Drying and Shrinkage

When plaster dries, it tends to shrink, which leads to those fine hairline cracks you often see in new or freshly renovated homes. The good news? These are usually nothing to worry about. A bit of filler or a fresh coat of paint should do the trick.

Temperature Changes

Shifts in temperature or humidity can cause materials to expand and contract, which, over time, creates cracks. Proper insulation and maintaining a stable indoor climate can help reduce this type of damage.

Building Settling

As houses get older, they naturally settle into the ground, which can cause vertical or diagonal cracks. These are usually minor, but it’s smart to keep an eye on them just in case they turn into something more serious.

External Vibrations

Things like heavy traffic, nearby construction, or underground trains can cause vibrations that lead to cracks over time. Reinforcing and fixing plaster wall cracks or regularly checking the cracks can help manage this.

It's always best to hire a qualified professional for any plastering service to ensure a smooth, long-lasting finish and avoid costly mistakes.

Types of Plaster Cracks

Not all cracks are created equal! Here's how to tell the difference between harmless ones and those that need a pro’s help.

Hairline Cracks

These tiny, surface-level cracks are usually nothing to worry about. They happen from minor shifts or drying and can be easily fixed with simple tools. Just keep an eye on them to make sure they don’t grow, but most of the time, they’re no big deal.

Vertical Cracks

Vertical cracks are super common, especially in newer homes.
They usually show up because of natural settling or shrinkage and aren’t a major issue. That said, if they start getting bigger or longer, it’s worth having someone take a look just to be safe.

Diagonal Cracks

Diagonal cracks, often in a staircase pattern, can be a little more serious.
They usually mean there’s some structural stress or movement going on. If you spot them, it’s a good idea to get a structural engineer to check things out since they could hint at foundation problems.

Horizontal Cracks

Horizontal cracks can signal big issues, like foundation pressure or subsidence.
Now, these are the ones to take seriously. These cracks can compromise the whole structure, so don’t wait, call a professional with expertise in fixing plaster wall cracks.

Check out our blog, “Transform Your Home with a Professional Plastering Service,” to see how expert plastering can enhance the look and feel of your space.

Which Cracks in Walls are Serious?

The size of the crack is also a significant indicator of the severity of the situation.

How to Fix Plaster Wall Cracks?

If you are thinking about fixing plaster cracks on your own, here are the steps you need to follow.

• Step 1 - Preparation
  Start by gathering all necessary tools, such as a Stanley knife, joint compound, filler knife, drywall tape, sandpaper, and a vacuum. Clear the workspace of any dust and debris, and protect the floor with a drop cloth.
• Step 2 - Score the Crack
  Carefully use a Stanley knife to widen the crack into a V-shaped groove. This removes loose plaster, smooths the edges, and helps the joint compound adhere better for a lasting repair. Take your time for precision.
• Step 3 - Clean the Crack
  Ensure the repair area is clean by vacuuming out any leftover dust or debris from the crack. A clean surface is essential to help the joint compound bond effectively and create a smooth, durable finish.
• Step 4 - Apply Joint Compound
  Mix the compound to the right consistency, then apply a thin, even layer over the crack using a filler knife. This layer creates a base for the drywall tape and helps seal the crack for stability. For a smooth finish, especially in spots like your living room or hallway, go with a good-quality joint compound.
• Step 5 - Embed Drywall Tape
  Carefully press a strip of drywall tape into the wet joint compound over the crack. Smooth it out thoroughly to prevent air bubbles. This step reinforces fixing plaster wall cracks and keeps the cracks from reopening over time.
• Step 6 - Smooth and Layer
  Apply additional layers of joint compound over the tape, feathering the edges outward to blend with the wall. Allow each layer to dry completely before adding the next for a seamless and professional finish.
• Step 7 - Sand the Area
  Once the joint compound is fully dry, gently sand the repaired area until it feels smooth and flush with the surrounding wall. Take care to avoid sanding too much, which could interfere with repairing cracks in plaster walls.
• Step 8 - Paint and Finish
  Prime the repaired section to ensure even coverage, then paint the area to match the rest of the wall. This final touch restores the wall’s appearance and ensures the repair blends in perfectly.

Tools You’ll Need to Fix Plaster Wall Cracks and Their Uses:

Here are some of the plaster crack repair materials and tools needed for the job.

• A Stanley knife to cut along the crack to create a clean edge and remove loose plaster pieces.
• A chisel to help widen the crack slightly and remove debris for better filler adhesion.
• A filler knife to apply and smooth the joint compound or filler into the crack.
• Drywall tape to reinforce the crack and prevent it from reopening by creating a strong base.
• Joint compound is the best way to fill cracks in plaster walls and create a smooth surface for painting.
• Sandpaper (medium to fine grit) to smooth out the dried compound for a seamless finish.
• Primer and paint to seal and finish the repaired wall, blending it with the rest of the surface.

DIY vs. Professional Plaster Repair

When to DIY

Got a few small wall issues? These are perfect for DIY:

• Hairline cracks: Some filler or paint is the easiest and best way to fill small cracks in plaster.
• Small holes (less than 5mm): A bit of spackle, a putty knife, and some light sanding, and you’re good to go.
• Cosmetic imperfections: Minor dents or uneven patches can be smoothed out with a patching compound and a little elbow grease.

When to Call a Pro

For bigger problems, it’s best to bring in the experts in fixing plaster wall cracks:

• Cracks larger than 15mm: These need a professional touch to ensure the repair is done safely and properly.
• Structural issues: If there’s subsidence or lintel failure, don’t wait. Get an expert in before it gets worse.
• Major damage: Big repairs or full restoration jobs are best left to skilled professionals who’ll make it look as good as new.

At Serviceteam, we’ve got your back with 24/7 plaster cracking on walls repair services in London. Our skilled pros are ready to tackle any challenge and get your walls looking perfect again!

Preventing Plaster Cracks: Tips and Best Practices

Prevention is always better than a cure, right? Keep your plaster walls looking great with these simple tips:

• Keep Humidity in Check
  Too much humidity can wear down your plaster walls over time. Use a dehumidifier in damp areas like the basement or bathroom, and make sure your home is well-ventilated to keep moisture at bay.
• Fix Leaks ASAP
  Water damage is plaster’s worst enemy. Got a leaky roof or a plumbing issue? Fix it right away to stop water from seeping into your walls, which can cause cracks, stains, or crumbling.
• Do Regular Check-Ups
  Take a few minutes every now and then to inspect your walls. If you notice new cracks, discolouration, or bulges, it’s better to deal with them early before they turn into bigger, more expensive problems.
• Watch Out for Nearby Construction
  Construction work nearby can create vibrations that mess with your plaster walls. If your neighbours are renovating, keep an eye out for new cracks and take steps to protect your walls if needed.
• Use Good-Quality Materials
  When it comes to plaster, quality matters; using high-quality plaster and preparing the surface properly can reduce the chance of cracks down the line. Investing in good plaster crack repair materials now means less hassle later!

How Much Does it Cost to Fix a Wall UK?

The costs of fixing cracked walls plaster can really depend on how bad the damage is:

• Got a small crack or a minor repair? That’ll usually set you back around £100 - £150.
• For moderate damage that needs professional tools and filler, you’re looking at £250 - £450.
• Bigger jobs, like structural assessments or re-plastering large areas, can go over £1,000.

At Serviceteam, we keep things simple with competitive, transparent pricing, no hidden fees here!

How Serviceteam Can Help with Wall Plaster Crack Repair?

Got cracks in your plaster and need help with fixing plaster wall cracks? Serviceteam has you covered!

Our experts will leave your walls looking flawless every time. Don’t let those cracks get worse—reach out to us today and give your walls the care they deserve. Book your free consultation now!

FAQs

How to repair plaster wall cracks?

To fix a crack, start by cleaning it up, then apply filler in layers. Once it’s dry, sand it smooth. For bigger cracks, add some joint tape before filling. Finish it off with primer and paint for a tidy look.

How to fix cracks in new plaster walls?

Just use a flexible filler, sand it down, and paint. Good ventilation helps prevent more cracks later. Small cracks, like hairline cracks, are pretty common as it dries.

What causes damp patches on plaster walls?

They’re usually caused by leaks, poor airflow, or rising damp. Find the source, fix it, and let the wall dry completely before repairing cracks in plaster walls.

How do I deal with flaking or peeling plaster?

If the plaster is loose, scrape it off, sand the area, and use a bonding agent. Replaster if necessary, then finish with primer and paint. Make sure any moisture issues are sorted first to avoid future problems.

What’s the best way to paint over repaired plaster?

Once your plaster cracking on the walls is repaired, let it dry fully. Start with a mist coat (a mix of paint and water) as a primer, then follow with two coats of regular paint for a smooth, seamless finish.