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A wall that crumbles is not very aesthetic, not to mention all the nuisances that can be grafted as a bad smell of moisture. Before treating the problem, it is necessary to first find its origin in order to apply the right solutions for a sustainable result.

Wall crumbling: the causes

Causes of crumbling a wall are diverse and do not have the same consequences. Before bringing a treatment one must first know the origin. The first check to make is the friable nature or not of the material that constitutes the wall.

It can also be humidity which causes the walls to crumble as a result of water damage, poor ventilation, excessive condensation, heating problem or water infiltration. in the cracks. The most obvious signs of a moisture problem are the presence of marigold (fungi), mold, saltpetre and an unpleasant odor.

Crumbling wall: what to do?

Before starting anything, the diagnosis of a professional is essential if we do not see the problem reappear regularly. The complete treatment may require some work and investments such as the purchase of a ventilation system, the installation of a drainage or the injection of resin into the walls. Before any intervention on a wall that crumbles, it must first proceed to a cleaning phase. Dust and traces are removed with a hard brush, special detergent or paint stripper to remove paint and make a clean space.

The treatment for a crumbling wall

Two simple tests make it possible to evaluate the state of the wall in order to choose the appropriate treatment. Take a sharp object to scratch the wall to see if it crumbles easily or make the chalking test by running your hand over the wall to see if there are white marks on it. In both cases, the best solution is to apply a thick layer of hardener with a roller or a brush. It is a fast treatment that can dry in 24 hours. The product is easy to find in a DIY store and requires little supply. But for the solution to be sustainable, it is advisable to appeal to the know-how of a professional who will find the cause and the appropriate treatment.


After the treatment, there is no question of repainting or putting a wallpaper directly on the wall. First we will have to make some finishes.
The wall may present some flaws as cracks, holes, etc. It will therefore be necessary to put some filler. It exists packages ready for use in paste or powder to be applied using a spatula. After drying, a good sanding of the wall gives a smooth and perfect appearance to the coating. It only remains to finish with a thin layer of plaster spread with a wide spatula and the wall will be like new.

Video Instruction: How To Repair Rising Damp In A Wall.