The phenomenon of small cracks in the wall

Wall cracking is an incident that does not belong to water-based paint, but it seriously affects the quality of the paint film, causing wall penetration, resulting in alkalinization problems - discoloration, mold, reducing the overall life of the construction. submit. Therefore, in order to limit the sources of unwanted incidents, this document will provide more information about the phenomenon of wall cracking to help customers have more necessary information.

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Description of the phenomenon

The wall surface is cracked, the cracks develop in length and depth over time, mainly in the first 6 months, especially in the first week. If the surface has mastic, only when the crack is large enough and the tensile strength is large enough to exceed the tensile strength of the mastic, the crack will be seen even though the crack has occurred before.

Reason

Due to the characteristics of Vietnam's climate, it is hot and humid
Due to construction techniques
Mortar mix once and use for a long time
After painting the wall without maintenance, water and moisturize regularly (4-5 days) especially the west-facing surfaces
Using high grade cement (PCB over 40) should use mac PCB 30 cement.
Cement is too thick (2.5cm) or too thin (<1.0cm).
Cement is not careful (walls need to be finished for about 10 days to be painted).
Non-standard wall construction: the mortar circuit is not "saturated", the slurry has a lot of water.
Due to the source of construction materials
The sand is too fine, the sand used to build the bowl has a relatively large clay content
The bricks used are of low quality, or are produced by manual technology

How to handle it?

If the wall surface has small cracks: use a waterproofing additive or a primer with waterproof and elastic ability to prime the entire wall surface, then paint normally. Large cracks: follow the cracks with a width of 0.5 cm - 1 cm, spray silicone glue and then repaint
Punch off the cement layer, clean it, fix the wire mesh, re-cement and then start the painting process from scratch.
Especially serious: knock down the wall and rebuild

Precautions

Construction techniques: Mixing mortar: mix just enough for immediate use. After cementing the wall, it should be maintained and watered regularly (4-5 days). High grade cement should not be used to paint the walls (PCB over 40), should use mac cement PCB 30 .
Should cement in the thickness of 1 - 2.5cm.
No rush to cement - the wall is finished after 10 days of cementing.
Mix the mortar according to the standard
Select sources of construction materials, sand with suitable fineness, use high quality bricks.

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