Home Improvement

How to fix the "wall crack"

5:49 PM



To repair worn plaster on the walls, removing it is neither the best nor the cheapest method. In most cases, it is recommended to apply a new plaster over the old one. One of the best ways for foundation repair is to cover it, instead of removing it. It's not just more natural, but it's even more logical.


Why do they appear?
We all affect the environment regularly. We give it shape, we change it and adapt it according to our needs. As a result: some rising pollutants that affect the facades of buildings. Some contaminants, especially organic contaminants and dust, are deposited on the facades of the houses. This encourages the development of mold, algae, and fungi - resulting in a phenomenon called microbiological corrosion. How can you recognize it? When you notice a brown-gray film on the surface of the building. These are colonies of microorganisms in a developmental state. In later stages, they can permanently damage the facade.

If you fail to stop this process from time to time, sometimes needing to remove and replace the plaster, the damage may extend further, especially if there are favorable atmospheric conditions. For example, this problem affects the North-facing walls. Also, when the house is in the vicinity of vegetation or the environment is wet, microorganisms thrive.

Clean the old plaster
First of all, it is necessary to clean the surface of the old plaster, especially in the damaged and contained areas: you must get rid of dust, traces of smoke or any other contaminants. The best method is to use the CT 98 cleaning solution and then wash it with water under pressure. A too heavy water jet can worsen the integrity of the places where the plaster needs repair. If the facade is contaminated with algae or fungi, it is recommended to use a unique concentrate that can remove these harmful factors. Click here.

Applying a fungicide concentrate
In places where a so-called biological attack (mold or algae) took place, use a fungicide concentrate with a brush or spray on the freshly washed facade.

It is necessary to repair the parts of the wall where the thermal insulation has been mechanically damaged, and the continuity of the reinforcement mesh has been interrupted. You must remove this part of the facade using an angle grinder or another suitable tool. Also, remove the reinforcement mesh around the affected section. Next, remove a section of the thermal insulation material and stick it to the affected area.

Apply adhesive
After the mortar or polyurethane adhesive has hardened, apply mortar to the place where you removed the plaster. Then use the curing net to the fresh mortar. This mesh must be more significant than the distant section to overlap with the already existing part with approx. 10 cm.
After cleaning the plastered surface and making insulation and curing repairs, it is time for a new layer of plaster. Applying it directly to the old layer can cause problems, and on the other hand, it is not economical. To solve rough areas, you should smooth the surface of the old plaster with an adhesive and mortar for hardening. This method is much more comfortable and convenient than the snoring way.

After the base coat dries, it is essential to apply a primer - a significant step when applying thin layers of plaster. Using a substrate improves the adhesion strength of the plaster and reduces the possibility of surface stains due to the properties of the substrate or inadequate preparation.


Apply the thin layer of plaster after 4 hours after the primer has dried completely. If you use mineral plaster for subsequent painting, it is essential to apply a paint coat before to ensure that the plaster has the necessary resistance to atmospheric conditions. Using a stainless steel trowel, apply a uniform coating of plaster on the prepared substrate. Collect excess material and add it to the bucket of the product. The remaining area should be smoothed with a plastic spatula.


The plaster will dry in 12-48 hours, depending on substrate, temperature, and humidity. While the loads continue and the plaster dries, the substrate temperature of the ambient environment must be between + 5 ° C and + 25 ° C and the humidity is below 80%.

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