Cracks in plaster are common in older buildings and can often be a sign of natural settling. However, not all plaster cracks are harmless. Understanding when to call a professional for plaster wall cracks is crucial to prevent further damage. 

In this article, we’ll look at various situations where cracks in plaster when to worry are more than just a cosmetic issue and when it’s time to call for professional assistance.

1. Widening Cracks In Plaster Walls

When Cracks Appear Larger Over Time

Cracks in plaster that grow in size over time are often an indication of a structural issue. These types of cracks should not be ignored as they could signal a more serious problem with the foundation or the structural framework of the building.

• Widening cracks often indicate that the building is shifting or settling more than expected, which can weaken the plaster and make it more prone to further damage.
• Structural shifts or settlement can cause cracks to expand, suggesting that the plaster is under stress.
• Urgency: If you notice cracks growing larger, it’s vital to call a professional to inspect the situation.

A professional can help assess whether the cracks are merely superficial or part of a broader issue requiring repair or reinforcement of the building’s structure.

2. Cracks Around Doors And Windows

When Cracks Appear Near Door And Window Frames

Cracks that form around door and window frames are a clear indication that there might be a more serious structural issue. These types of cracks can signal problems with the foundation, such as settlement or shifting, or issues with the framing of the home.

• Door or window frames shifting: If the door or window becomes difficult to open or close, this could indicate that the walls are shifting, causing the frames to misalign.
• Foundation issues: Cracks in these areas may indicate that the foundation is settling unevenly, leading to stress on the walls and frames.
• Professional inspection: It’s crucial to have a professional assess whether the problem lies with the foundation, framing, or both.

If you notice cracks forming around these areas, it’s essential to call in a professional to ensure your home’s foundation is not compromised.

3. Cracks Accompanied By Dampness Or Mold

When Water Damage Is Present

Cracks in plaster that are accompanied by dampness or mould growth are more than just a cosmetic issue. These signs often point to water ingress or moisture build-up within the walls, which can weaken plaster and cause long-term damage.

• Water leaks: If the cracks are caused by a leaking pipe, roof leak, or rising dampness, the moisture can lead to further structural damage.
• Mould growth: Mold often appears in damp areas and can spread quickly, causing both health risks and deterioration of the plaster.
• Immediate attention required: A professional can diagnose the source of the moisture, fix the leak or damp issue, and repair the plaster effectively.

If you notice any signs of moisture or mould around plaster cracks, it’s critical to call a professional to both deal with the water issue and restore the plaster.

4. Large Or Deep Cracks In Plaster Walls

When Cracks Are Significant In Size

Cracks that are large or deep should always raise a red flag. These types of cracks often indicate that the plaster is under significant stress, potentially due to structural movement or other serious issues.

• Size of cracks: Cracks that are wider than a few millimetres or those that penetrate deep into the wall are more concerning.
• Structural problems: Larger cracks often signify problems with the structural integrity of the wall, foundation, or framing.
• Potential for further damage: Attempting DIY repairs on large cracks without properly addressing the underlying issues could lead to further damage to the wall and the building structure.

If you find significant cracks in your plaster, it’s essential to call a professional to assess the situation and ensure the wall’s integrity is preserved.

5. Cracks That Keep Reappearing After Repair

When Repairs Don’t Hold

If cracks in your plaster keep reappearing after repairs, it could suggest that the root cause of the problem hasn’t been properly addressed. Recurrent cracks may indicate an ongoing issue, such as settling, moisture, or shifting, that needs to be tackled by a professional.

• Failed repairs: If you’ve attempted to repair the cracks yourself but they return after a short period, it’s a sign that the underlying problem persists.
• Reoccurring structural shifts: In some cases, the building might be settling, or the foundation could be unstable, leading to repeated cracks.
• Underlying issues: A professional will be able to assess whether the cause is due to structural movement or another underlying problem, ensuring the repairs are lasting.

When plaster cracks keep returning, calling a professional ensures the cause is properly identified and resolved.

6. Sticking Or Misaligned Doors And Windows

When Doors And Windows Become Difficult To Open Or Close

If doors and windows are suddenly difficult to open or close, this is often a sign that the walls around them are shifting. The misalignment of doors and windows usually results from a shift in the building’s structure, which can also lead to cracks in the plaster.

• Door and window misalignment: Misalignment often occurs due to foundation settlement or structural movement, which can put stress on the walls and frames.
• Cracks causing shifts: As the walls shift, plaster cracks can form around the door and window frames.
• Time to call a professional: A professional can assess if the issue is due to structural movement and make recommendations to rectify the problem.

Misaligned doors or windows are a clear sign that you should contact a professional to inspect the building and ensure its structural integrity is intact.

7. Severe Cracks In Load-Bearing Walls

When Cracks Are Present In Load-Bearing Walls

Load-bearing walls are essential for the stability of a building. Cracks in these walls are a cause for concern and should be addressed immediately. These cracks could indicate that the wall is no longer supporting the load of the building properly, which could lead to serious structural issues if not repaired.

• Weight-bearing significance: Load-bearing walls carry the weight of the building above, and cracks in these walls may indicate that the wall’s ability to bear weight has been compromised.
• Serious structural damage: Cracks in load-bearing walls are often a sign of more severe issues, such as foundation problems or a collapse risk.
• Immediate professional help required: If you notice cracks in load-bearing walls, call a professional right away to assess the situation and ensure the safety of the structure.

In cases where load-bearing walls are cracked, it’s essential to consult a professional immediately to prevent further damage and ensure the safety of the building.

Conclusion

Understanding when to call a professional for plaster wall cracks can save you both time and money in the long run. While minor cracks may not be cause for concern, larger, deep, or recurring cracks may indicate underlying structural issues that require expert attention. 

By paying attention to key signs, such as widening cracks, cracks near doors and windows, and cracks accompanied by dampness or mould, you can prevent further damage and ensure the structural integrity of your home. If in doubt, always seek professional advice to ensure the best outcome for your plaster walls.

Frequently Asked Questions

What Causes Cracks In Plaster Walls?

Cracks in plaster walls can be caused by a variety of factors, including the natural settling of the building, moisture damage, temperature fluctuations, and structural movement. Over time, buildings shift, and this can lead to cracks, which may be cosmetic or a sign of more significant issues.

Can I Repair Plaster Cracks Myself?

Small, hairline cracks can often be repaired by homeowners using basic materials and tools. However, larger cracks, recurring cracks, or cracks that suggest structural problems should be handled by professionals to ensure proper repair and to address any underlying issues.

How Do I Know If I Need Professional Help With Plaster Cracks?

If you notice cracks that are widening over time, appear around doors and windows, or are accompanied by dampness, mould, or misalignment of doors and windows, it is time to call a professional. Professionals can assess whether the cracks are due to structural issues and recommend appropriate repairs.