Updated: Jul 8, 2020
Cracks are a very common issue and a topic among the waterproofing industry. It could be a disaster as they can lead to water damage and jeopardize the stability of the foundation. However, not all cracks cause structural damage. Some cracks are just a natural sign of aging, but they should never be ignored.
Cracks can start off as non-structural, allowing water to enter through the crack. If left alone, the water eventually deteriorates the inside of the concrete causing cracks to widen. Since water follows the path of least resistance, it will flow through these cracks creating a perfect habitat for mold, mildew, and insects too.
Non-structural cracks are caused by fluctuations in the moisture content and thermal movement like for example, the wall is within a room that is periodically air-conditioned or it faces the afternoon sun quite a bit. The movement of contraction and expansion can cause hairline cracks to appear on the wall. Here are some characteristics of non-structural cracks include:
Less than 2mm cracks
Vertical to diagonal cracks
Cracks at the corners of doors and windows
Narrow, less than 3mm
Cracks in plaster
Most hairline cracks can be resolved with a DIY job while you can save some cost instead of hiring a professional to do the job for you. Check out this latest DIY product, Soulmaid-Handymate which can solve the hairline cracks at ease.
1. It might seem counter-productive, but you should first create a deeper hairline crack using a scraper, screwdriver, or utility knife before starting the repair work. This “opens up” the crack so that you can clean out the loose concrete, paint, debris, or old filler.
2. Using a sponge or brush to apply the primer bonding along the crack lines before mending. This will increase the adhesiveness between the substrate, helps the filling solution to properly fill the insides of the crack, and enhance the overall performance of the solution.
3. After the primer dried for 10-15 minutes, fill it with the filling solution/joint compound, and make sure the filler covers the entire cracks.
4. Even out the surface with a scraper and recoat it after every 1-2 hours recoating time.
5. Once the final coat's surface has fully dried, sand it down using sanding paper so the surface is completely smooth and even.
6. After all, apply the paint as the final step and the wall will look seamless like brand new.
For moving cracks, a more rigid Epoxy and Polyurethane Modified material are used to seal the substrate and hold the crack in place. At this stage, it is best to rope in a professional to assess the situation and handle the job for you. Identifying the cause and use the correct solution to repair the crack properly can help to prevent cracks in the future.
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