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Repair a crack in the wall

Repair a crack in the wall


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Repair a crack in the wall: instructions for restoring the house wall by eliminating surface cracks and crevices. Cracks in the wall, when to worry and other info.

Acrack superficial is a long and narrow crack that affects the outermost part of the masonry: paint and plaster. On this page we will seewhat to doin case ofcracks in the wall: how to repair them both in the case of an internal wall and an external wall.

When acrack in the wallit's moredeepand it affects a large part of the masonry, we talk about cracking and in this case it would be better to worry and analyze the possible consequences on the whole house.

Crack in the wall when to worry

When, thecracks in the house wallneed to worry?To answer this question we should know the history of the building in question, however, in this paragraph we will try to give a first answer.

The cracks surface affecting only the layer of paint and the underlying plaster, should not trigger concerns, the cause is almost always rising damp, water infiltration or moss. When thecrack in the wallconsists of an authentic slot in themasonryat home, the discussion changes and an important estimate must be made.

The appearance of a crack in the brickwork of the house indicates that there was amovementand the evaluation to be made is whether thismovementcaused serious consequences on the building. For more information oncracks in the wallswe refer you to the articlecracks in the masonry, on this page we will only deal with superficial cracks. In general:

  • if the crack in the masonry involves a load-bearing wall, you may need to worry.
  • If the crack in the masonry concerns a dividing wall inside the house, it is only worrying if you notice a difference in level on the floor.
  • In any case, in the presence of deep cracks in the walls of the house, it is advisable to contact a technician to estimate the damage.

Repair a crack in the exterior wall

Returning to the surface cracks, these concern the plaster and are generally a clear symptom of the presence of moisture in the wall. For repair a crack in the wall, be it external or internal, the same procedure is carried out; the only precaution to follow is that in the case of external walls you have to choose plaster and paint for exteriors, i.e. resistant to atmospheric agents.

Forrepair the crack on the exterior wallwe recommend paintingsanti-mold, anti-algae and anti-moss: some paints retain a biocide substance capable of preventing the appearance of mold or moss in the wall. As for the procedure, follow the one seen for the internal walls.

Repair a crack on the interior wall of the house

To repair the crack you will have to act on all the affected plaster. Use aV-shaped scraperto remove the ruined plaster affected by the crack. If the plaster is yielding, remove all decaying parts with a mallet and flat-tipped chisel.

Warning!
If the wall is so badly reduced that, in addition to the plaster, part of the underlying concrete also comes off, follow the guideHow to recover an external wall, the same procedures can be used for the internal walls of the house.

In case of cracks on walls in perfect health, after using the V-shaped scraper, use an iron brush or coarse sandpaper (100) to obtain a smooth surface. Finally you will need to:

  • Clean the crack with a dry brush to remove dust.
  • Moisten the crack with a few drops of water.
  • If the surface is porous and not at all irregular, apply a fixative primer. Wait for the drying time (2 to 6 hours)
  • Pass the ready-to-use plaster paste applying a lot of pressure at the time of application.
  • Only repaint the repaired part when the grout is completely dry.

What material to use to repair the crack in the wall?

  • Filler putty for walls
    Better if quick-drying.
    It will serve for "fill the crack“, Or rather, to fill the space of the crack in the wall. It should be applied with a spatula perpendicular to the crack (it should not be placed from the other downwards, but from left to right and then from right to left to make sure that the entire crack is filled with grout). When applying, make the grout penetrate well into the crack: apply a lot of pressure with the spatula!
  • Reinforcement tape
    It is used to prevent the crack from reforming and should be applied after the grout. Use reinforcement tape only if thecrack in the wallit often tends to form. After application, make a second, very thin coat of putty.

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