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Damp is an on-going problem in many homes in Britain, and that’s not just in the older ones either. Water, especially when forced by wind can find its way inside an outside wall through the tiniest of cracks. After the leak is fixed, it’s time to Find a Plasterer to fix the evidence that alerted us to the damp in the first place.
The Problem
The water has leached the cement away leaving weakened plaster that will eventually come off. The only solution is to hack it out and replace it. You have a choice, though. You could Ask Mr-Skill to Arrange a Plaster Quote, or you could have a go at it yourself.
Repair Stage One
You have to get rid of the damaged plaster at least a foot above any visible damage or residual salts. If the damp was low down, then you must in any case remove the plaster to three feet above floor level. Brush away every grain of loose material. Complete the job with a vacuum cleaner – you may wish to do this when the wife is out shopping.
Repair Stage Two
This is a tip a London Plasterer taught me years ago. Put on a pair of disposable latex gloves. Make a slurry of cement powder and water with a cup of bonding liquid added – the final consistency should be like runny porridge. Brush this firmly over the space where the old plaster came out. This will allow the new plaster to adhere properly. Wash your hands and tools immediately. Allow the slurry to dry for a day.
Repair Stage Three
Make up a stiff plaster mix of 3-Parts sand to 1-Part cement. Apply this with a wide paint scraper or steel float across the entire surface roughly, and leave it alone for two hours to set. Apply a fresh mix of plaster that stands just proud of the surface. Work this off with a straight edge later the same day. 
Leave the job to cure for a week.
Repair Stage Four
Apply a moist mix of Polyfilla over the entire surface. When it’s totally dry and the surface has gone a little powdery, finish the job off with an a sanding block or orbital sander, using medium-grit paper. After that, you are ready to decorate!
That’s all very well in theory, but do you really have the time to spend on this? If not, that’s where Mr-Skill comes in. We provide a matching service between customers and tradespeople. Unlike some others, we don’t add a penny to the cost of jobs.