Painting a damp wall

General, Interiors

Most houses – especially older ones – will have some spots which are susceptible to damp. This isn’t necessarily any reason to be too worried or to get the specialists in. Just by living in a building we create moisture. From condensation in our breath to boiling kettles, steamy showers and washing up spills we make moisture. Any wall which might be particularly cold, eg an external wall or walls in a room which rarely gets sunshine, will be at risk of being a condensation hotspot.painting

Check our previous blog if you want to find out more about the causes of damp. If you are concerned that the issue in your home is from something more serious than just condensation then it might be worth getting a specialist in for a second opinion.

When it comes to decorating a damp wall it can be a bit tricky. If you tackle it like a normal wall you can risk the paint peeling away as it dries. Or, if you’re using an oil based paint you can risk chemical entrapment which can be a problem down the line.

To help with the process of painting those nasty damp spots we’ve popped together this quick ‘how to’ guide for you to follow.

  1. Before you start

Assess the extent of the stain so you can decide how to proceed. If the stain is still wet or has any efflorescence or mould then tackling this  is very important before you get any paint involved.
– If you’re happy that the stain is old, dry and has no rust or residue you can simply paint it with a good anti-stain paint. You can generally pick this up at your local DIY store and it’s not too expensive.
If you’re not this lucky and the wet spot has mould or residue then you will need to remove that first. To do this you have two options: use a diluted bleach solution and apply it to the stain with a cloth or soft brush, or apply hydrogen peroxide with a rag to remove fungi. When finished, rinse the area and leave it to dry completely before moving onto the next step.

  1. Treating the stain

A good idea, if you’re dealing with quite extensive damp damage, is to apply a chlorinated rubber paint to the stain. This kind of product is perfect for permanently removing the problems of damp on the wall. This kind of paint that is popularly used to paint pools as it has a very good fungicide effect. Once you have applied the paint on the stain, leave it to dry for 15-20 minutes. – This may depend on the specific product so it’s always best to check the packaging.

  1. Painting

After you’re happy the chlorinated rubber paint has had enough time to dry then you can move on to painting over your stain. To do this, simply paint the wall as you would have done if it wasn’t damaged.

By spending a little extra time to tackle the damp before you paint you should save yourself the stress having to do it all again!

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