How To Deal With Damp Exterior Walls?


  1. Keep on top of outdoor home maintenance. Prevention is better than cure when it comes to damp problems. …
  2. Make sure your home is well-ventilated. …
  3. Avoid producing lots of moisture. …
  4. Take care when cooking. …
  5. Remove excess moisture. …
  6. Choose moisture resistant paint and wallpaper. …
  7. Leave room to breathe.


Try a bleach-based spray (always try the product on a small part of the surface first before treating the whole of the affected area). You can also try a homemade spray made from one part white vinegar and one part water. Spray the product on the wall and let it work overnight.

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Frequently Asked Questions

How do you treat damp outside walls?

How to Treat Damp On External Walls?

  1. Repairing masonry defects e.g. cracks in walls, faults doors. If there are any problems then this will need to be fixed with a suitable render. ...
  2. Remove excess moss and leaves from roofs and gutters. ...
  3. Improve the heating of the property and insulate the cold walls.

How do you stop damp in an old house?

A Damp Proof Course (DPC) is an impervious layer built into a wall. It is placed above ground level to prevent moisture rising up the wall via a capillary action. Older buildings used a range of materials for a DPC, including slate, bitumen, jute and hessian. Nowadays plastic DPCs or chemical injection DPCs are used.

Why does my exterior wall get damp when I paint?

Fixing the cause of the damp is essential before you paint your wall. If you don’t deal with the problem, it could return after the wall has been painted. You also need to allow the wall to dry out. In most cases an exterior wall will just be wet from rain.

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