Understanding cracks in drywall and effective fixes

Struggling with cracks in drywall? Here’s how to fix and prevent them

Home Care/ Decor

Struggling with cracks in drywall? Here’s how to fix and prevent them

Cracks in drywall require different treatment than cracks in brick or block walls. Learn how to fix cracks in walls, apply solutions for cracked wall repair, and prevent damage with effective waterproofing solutions.

Winter brings more than just a drop in temperature—it also brings visible structural changes in homes. Among these, drywall cracks are one of the most common and concerning issues homeowners face. These cracks often become more noticeable during the colder months due to temperature fluctuations, moisture infiltration, and material expansion.

Understanding the causes of drywall cracks and knowing the best way to repair them is essential for maintaining a building's integrity. This article explores why drywall cracks appear in winter, how construction materials and practices influence them, and effective methods for repairing cracked walls.
 

Why do cracks in walls appear?
 

Several factors contribute to the formation of cracks in walls, particularly in drywall constructions. Drywall is commonly used for partition walls, curtain walls, and false ceilings, but its material composition and structural properties make it more susceptible to cracking.
  1. Construction methods –

    Poor construction techniques, inadequate support, and improper material use can lead to weaknesses that result in cracks in drywall.
     
  2. Substandard materials –

    Low-quality gypsum boards, adhesives, or poor finishing increase the likelihood of cracking over time.
     
  3. Structural load –

    Drywalls are not designed to bear structural loads and usually serve decorative purposes. Any excessive pressure can cause stress fractures. 
     
  4. Waterproofing issues -

    Water infiltration weakens drywall, which is highly porous and absorbs moisture. This leads to deterioration and cracks in the walls.
     
  5. Hidden plumbing lines –

    Pipes running behind the drywall can cause moisture buildup if there is a slight leak or condensation, accelerating damage and weakening the structure.
     
  6. Insufficient thickness –

    Thin drywall sheets are more prone to bending, warping, and eventual cracking due to temperature changes.

Why do cracks become more visible in winter?
 

Many homeowners notice more cracks in walls during winter due to the temperature and moisture fluctuations. When moisture trapped within drywall freezes, it expands, forcing small cracks to widen. Additionally, cold temperatures increase water density, allowing it to seep deeper and worsen hairline cracks on walls. Moreover, thermal contraction plays a role as drywall and other materials shrink in low temperatures, putting stress on joints and causing visible cracks in the drywall.
 

Common materials used in drywall construction
 

  1. Gypsum board –

    Cost-effective and commonly used, but requires additional waterproofing.
     
  2. Fibreglass –

    Costlier but provides improved resistance to moisture and cracking.
     
  3. Plaster of Paris (POP) panels –

    Used for decorative ceilings but prone to cracking if exposed to excess moisture.
     
  4. Plyboard and compressed wood –

    Stronger alternatives for partition walls with comparatively better load-bearing capacity.
     

How to fix cracks in walls: Best repair solutions
 

If you have been wondering how to repair cracks in walls, know there is no single solution. The best way to repair drywall cracks depends on the size, depth, and underlying cause of the crack. A step-by-step approach ensures long-term durability –
 
  1. Assessing the crack –

    Before choosing a repair method, understanding whether the crack is cosmetic or structural is crucial.
     
  2. Identifying the cause –

    Determining if the crack is due to temperature changes, moisture issues, or structural faults helps apply the right solution.
     
  3. Using a non-expanding membrane –

    For minor cracked wall repair, a non-expanding membrane helps seal the gaps without causing further stress on the wall.
     
  4. Applying fillers –

    Small cracks can be repaired using joint compound or specialised wall fillers to restore a smooth surface.
     
  5. PU foam for larger cracks –

    Expanding polyurethane (PU) foam is ideal for sealing deep cracks and preventing moisture ingress.
     
  6. Priming and painting –

    After sealing, applying a primer ensures adhesion, followed by paint to match the surrounding surface.


Effective waterproofing solutions for preventing cracks
 

Waterproofing is crucial in preventing cracks in walls, particularly in drywall structures. Proper techniques ensure longevity and resistance to moisture damage.
  1. Membrane method –

    Applying a waterproof membrane adds an extra protective layer, reducing moisture infiltration and preventing hairline cracks on the wall.
     
  2. Surface adhesive method –

    Waterproof adhesives strengthen drywall joints and prevent water penetration.
     
  3. Admixture solutions –

    While not commonly used in drywall, some advanced formulations can be applied to enhance water resistance.
 

Maintenance tips for drywall structures
 

Due to the thin nature of the materials used for its construction, drywall requires more maintenance than traditional walls. Regular inspections and proper care help in reducing the frequency of cracked wall repair –
 
  1. Use thicker waterproofing membranes –

    This ensures greater protection against water absorption and structural weakening.
     
  2. Monitor mould growth –

    Excess moisture can lead to mould, further weakening drywall and contributing to cracks in these walls.
     
  3. Scheduled inspections –

    Checking for early signs of damage helps apply timely solutions.

An expert’s help is mandatory
 

While drywall cracks may seem like minor cosmetic issues, they can require complete replacement if concerns are ignored.
 
Proper waterproofing methods, high-quality cracked wall repair products, and regular maintenance can help homeowners protect their drywall structures. Whether you want to explore how to fix cracks in walls or reinforce weak areas, Dr. Fixit takes a proactive approach, ensures long-lasting results, and minimises costly repairs. To contact us, fill out the form below.
 

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