Repair cracks in the plaster

In the outer masonry, cracks appear again and again due to the movement of the different materials among each other. Tree roots from trees that stand next to the house can also be responsible for cracks in the masonry or it if the external plaster is chipped off by mechanical action, e.g. kicking against the wall, instead of. Repairing cracks in the plaster is not as difficult as you think.

When should cracks in the masonry be repaired?

• If the masonry is still fresh and working, fine cracks can appear in the plaster again and again. Here you should therefore only go over the cracks with a little paint. In addition, it can happen again and again that newly plastered surfaces due to large temperature fluctuations Get cracks because mineral plaster is too brittle and rigid to compensate for these fluctuations can.
• In order to protect any existing thermal insulation that has been plastered over, cracked plaster should be used be repaired, since the thermal insulation pads are very sensitive to shock and it is also a visible "cosmetic" problem represents. Therefore, you should mend such cracks in the plaster.
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Mending plaster is not that difficult

With a little manual skill, you can repair cracks in the plaster yourself. However, some preliminary work is necessary for this.

• First, clean the deep cracks in the outer wall that are to be plastered with a pressure washer. Remove loose plaster residue and knock away the old plaster from deeper cracks in the masonry. Loose, finer plaster residues can be removed with a metal brush or a scraper brush (otherwise the high-pressure cleaner would do more harm than good).


Hairline cracks in the plaster - how to fix the wall

Hairline cracks in the plaster can arise from various causes. Basically, you have to ...

• Fill in large cracks before Plastering separately, with a filler for the outside. Then you should apply a plaster primer (hardware store) for a better hold of the plaster. Let it dry out well.
• If the plaster has repeatedly fallen off over time, you should use an expanded mesh (wire mesh) work in, because this offers a better hold and renewed tearing of the plaster over a longer period of time prevented.
• If you have corners or edges on the outer wall that you want to plaster, apply a metal edge protection before plastering, which prevents the corners from being damaged again and again.
• Now wet the part of the wall to be plastered so that the wall is dampened but not wet, otherwise the freshly applied plaster will slip away.
• Mix the plaster in the mortar bucket so that it is slightly crumbly. Also note the manufacturer's information on the plaster pack.
• Then smooth the plaster onto the cracks or use a smoothing trowel for larger areas. More experienced do-it-yourselfers can also use the trowel to throw the plaster onto the wall. Let the new plaster stand only about 2 mm above the old plaster. Then smooth the plastered area with a square timber.
• Now let the plaster dry and after a few hours you can start brushing the edges. The brush should be wet, clean and soft. After another day, carefully scrape off protruding edges with a spatula.
• Before you can paint or exterior wall Tiles apply, but you should allow the plastered masonry to dry properly for a few more days.

If it doesn't work right away, don't be discouraged, because no master has fallen from heaven yet. By the way, even a professional plasterer cannot prevent the masonry from tearing down again at some point, because high temperature differences arise again and again, which the different materials do not follow so quickly can.