If the marks reappear despite your best efforts, there is a deeper problem.
In this case, you should check the condition of the roof, exterior walls, and gutters. Poor insulation or leaks invisible to the naked eye could be the cause.
There are treatments for rising damp: the most common is injecting resin into the walls to block moisture from the ground. You can also consider anti-saltpeter treatment if the walls begin to crumble or turn white.
Here again, calling on an RGE (Registered Engineer) or a humidity expert can really save you from higher costs in the long run. A comprehensive diagnosis allows you to identify the real cause and implement the right solutions.
And if you’re renting, don’t wait to notify your landlord. Mold can be a real health problem, and it’s important to take care of things quickly.
Now you’re ready to tackle the dark corners of your walls. With a little vigilance and the right actions, you can say goodbye to stubborn dampness… and breathe easier in your home.
