The ceilings of old houses are often made of plaster applied on bacula: very fine wood elements connected to each other by a reinforcement of wire. This technique, which is very reliable over time, nevertheless ends up generating cracks as a result of work, water infiltration and even settling and movements of the structural work. These cracks, even if correctly treated, always end up reappearing. We must then choose a sufficiently sustainable method.
- Scrubber brush
- Wallpaper brush
- Sanding wedge
- Knife to coat
- Triangular scraper
- Prepare the cracks
- Closing the cracks well
Prepare the cracks
1. Start by scratching the paint that is more or less peeled around the crack. Then remove the crack, probe with the angle of the painter's knife all the parts that emit a hollow sound and that must be removed. Drop what does not fit.
2. Use a triangular scraper to enlarge the crack along its entire length.
The ideal is to dig the crack dovetail, that is to say with a crack tip wider than the edges. In this way, the coating that will be placed in the crack can never fall out.
Carefully scrape the "dead" plaster and all layers of paint and / or coatings, insufficiently adherent. Scrape around the crack with the flat of the triangle. Clean the crack with a scrub brush, dust off the crack with a vacuum cleaner.
All these preparatory actions will facilitate the attachment of the filler.
3. Once the crack has been prepared, moisten it with a sponge, go over the crack area and moisten the peripheral surfaces. The sponge should be pushed deep into the crack, so that the substrate is sufficiently moist so as not to compromise the setting of the coating.
Closing the cracks well
4. Choose a good quality plaster, which will be able to dry evenly, even in the case of thick plies. The coating must be "stuffed" vigorously with a spatula throughout the thickness of the crack. The coating must first be laid in the direction of the crack, then worked perpendicularly with the aid of the coating knife. The closed area may form a hollow, which will only become accentuated during drying. Spatula and coating knife should always be perfectly clean.
5. Then use the strip of calico, which you will apply fresh on the coating layer. This action must be done by small keys, by light taps.
6. Then cover the calico with a second coat of plaster. To keep it perfectly taut, hold it on one side with the spatula, and stretch it on the other with the coated plaster knife. Ideally, hold the knife at 45°.
You can then smooth the assembly by firmly pressing the cutting edge of the tool over the entire surface.
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