Concrete and Mortar 
Exterior Coatings 
Professional Sealants 
Roof Waterproofing 
Substructure Waterproofing 
Tiling and Grouting 
Water Tanks and Other Areas 
Wet Areas 
HomeEssential Steps to Fix Wall Cracks Before the Rainy Season
May 18, 2025
The rainy season brings a refreshing change, with cool breezes and the earthy scent of rain. However, while we embrace the beauty it offers, it also brings challenges for our homes. Moisture from the rains can seep through even the smallest cracks in walls if the home is not waterproofed. This water seepage leads to dampness over the short term and structural damage over the long run. The seemingly harmless damp wall cracks can also deepen over time, compromising the integrity of your home’s walls. That is why wall crack repair is essential before the rainy season sets in.
Before we take you through the steps of wall crack repair, it is also important to understand what causes these cracks. Once you know the cause, you can take the right steps to fix it. This blog will guide you through the essential steps to repair wall cracks and protect your home from the damage the rain can bring.
Common Causes of Wall Cracks You Should Not Ignore
-
Water Seepage into the Walls:
Rainwater and leaks seep into walls, weakening them over time and causing cracks to appear or worsen.
-
Wear and Tear Over the Years:
With time, the natural settling of the structure can lead to cracks in the walls.
-
Damp and Moisture Ingress:
Moisture infiltrates walls, especially when proper waterproofing is lacking, gradually weakening the wall structure and causing cracks.
-
Poor Work during Construction:
Substandard construction techniques, including improper wall waterproofing and the use of cheap materials, can lead to structural cracks in walls.
Step-by-Step Guide on How to Repair Wall Crack Efficiently
-
Step 1: Widen the Crack for Better Adhesion
The first step is carefully widening the crack with a chisel or utility knife. This step creates sufficient space for the crack filler paste or crack filler powder to ensure the materials adhere securely during the wall crack repair process.
-
Step 2: Clean the Area Around the Crack
Properly preparing the area around a crack is an essential first step when aiming for a long-lasting repair. Use a wire brush or vacuum to remove dirt, dust and loose debris. The goal is to ensure a clean, dust-free surface to which repair materials can effectively adhere without any multiple touch-ups.
-
Step 3: Apply the Crack Filler Paste
Carefully fill the crack using appropriate repair materials. For minor cracks, crack filler paste is ideal as it offers unmatched flexibility and ease of use. Larger structural cracks may require stronger materials like crack filler powder, which provides superior strength and excellent wall waterproofing capabilities.
-
Step 4: Let it Dry Completely
Allowing adequate drying and curing time is essential when repairing wall cracks. It is vital to prevent moisture from being trapped within materials as they dry. Doing so helps prevent issues such as shrinkage in materials like joint compound and further deterioration of the wall structure.
-
Step 5: Sand the Surface Smooth
Once the crack filler fully dries, take a piece of fine-grit sandpaper, around 100-grit and gently sand the repaired area. Use light, even strokes to smooth the patched spot and match the surrounding wall. It eliminates any raised areas or lumps and makes the surface even to the touch. This meticulous attention to detail pays off, particularly when battling the humid conditions of the rainy season.
-
Step 6: Finish with Waterproof Coating
The final step is applying a quality waterproof coating over the repaired area to seal everything for good. Properly waterproofing a wall after repairs is essential for long-term protection. Waterproof coatings make the repair more durable and ensure the crack remains sealed even after heavy rains.
Important Tips for Wall Crack Repair Before the Monsoon Season
-
Seek Professional Help:
For large or structural wall crack repair, it is best to consult a professional contractor or structural engineer to ensure the problem is properly addressed.
-
Regular Inspections:
Make it a habit to inspect your walls regularly for cracks. Prompt action helps prevent further damage and costly repairs down the line.
-
Fix Leaks and Drips:
Repair any leaks or drips in pipes or roofs that could contribute to wall cracks or moisture buildup, preventing future damage.
Where to Find the Right Solutions for Wall Crack Repair?
Once you understand how to fix and the importance of wall crack repair, it is equally important to know how to choose the right solutions for the repair. Remember that choosing a reliable and trusted brand that delivers everything you need for the best results. Astral Trubuild offers a comprehensive range of solutions, from crack filler paste to wall waterproofing, all available in one place. At Astral Trubuild, we provide three highly effective products for wall crack repair and wall waterproofing, each tailored to meet different needs:
-
Trubuild Crack Filler CFP 425:
For minor cracks, Trubuild crack filler paste provides a smooth, flexible solution that fills and seals small gaps effectively. It’s easy to apply and ensures a strong bond, keeping your walls protected from further damage.
-
Trubuild Crack Filler CFP 525:
For larger, deeper cracks, Trubuild crack filler powder offers superior strength and durability. It is ideal for structural cracks, providing a solid fill and enhancing the waterproofing of your walls.
-
Trubuild Walltect Topcoat and Basecoat:
These are designed to provide superior protection for your walls. The Walltect Basecoat offers a strong foundation, sealing cracks and creating an ideal surface for the topcoat. The Walltect Topcoat provides an extra layer of waterproofing, enhancing durability and ensuring long-lasting protection against strain. Choose Trubuild Walltect for a reliable, high-performance solution for waterproofing a wall and crack repair.
Together, these products offer comprehensive solutions for wall crack repair and wall waterproofing.
If you want to prepare your home for the rainy season, check out our guide to effectively waterproof your home walls.
