Are you tired of plaster and can't take your arm off every time you touch the walls? It is therefore time to remove it. But removing an interior plaster is not easy and there are many parameters to take into account. Jean Luc Dhorne, former business manager in painting and construction, now a teacher in a technical high school, enlightens us with his good advice.Interview by Caroline Delman
What are the different techniques for removing plaster?
There are two methods. The first is to use a stripper to remove the plaster. It is enough to spray the product on the plaster, to wait between 15 and 20 minutes (it depends on the products), to remove it using a spatula then to repeat the operation two or three times until the plaster is gone. The downside of this method is mainly the cost of the product. Allow at least 500 grams of product to treat one square meter. For a whole room, you can quickly pay large sums of money… It depends of course on the surface and the thickness of the plaster. The other method, the one I recommend, is the sanding of plaster, with an ordinary sander. The disadvantage will be the dust released, this is why it is necessary to protect the soil well before embarking on this operation (and protect yourself!).
Once the plaster has been smoothed or removed, what should be done to restore the wall to good condition?
The first thing is degreasing. Wash the wall with detergent diluted in water, or vinegar water or ammonia diluted in water. Then rinse with clear water. Apply a universal printing layer, an undercoat that protects and nourishes the wall. Finally, apply the filler to smooth the surface perfectly. Two or three coats are sometimes necessary.
When I remove my plaster, what are the mistakes not to make?
You should know if the support on which the plaster was made is plaster, Placoplatre® or concrete… If it is unpainted Placoplatre®, I do not recommend the use of strippers which could damage it. Also pay attention to the use of the stripper if you have a small budget and a thick plaster. It takes sometimes several layers of stripper to overcome a plaster and this can be very expensive.
What are the latest practical tips you could give?
To remove the plaster from a medium room, if you are using a sander, count a day's work. If you use stripper, count more than one day. It's a fairly long and messy job, but we're getting there. Finally remember to protect yourself with a mask, glasses and gloves among others. Learn more: "Interior paintings", by Jean Luc Dhorne, SAEP editions.