Why does the ceiling still crack after repair

Causes of ceiling cracking - cracking on the surface of the paint If it is only a linear, angular or amorphous crack on the ceiling paint film, it is not a big problem. This phenomenon may be caused by the first time, such as too thick or not dry and heavy, too loose or rough base, and mismatch between primer and topcoat. Fixes:

Remove the affected paint film; The paint film should not be too thick at one time; Make sure the front coat is dry before reapplying; Seal the substrate with a suitable primer if necessary; For substrates with high roughness, use products with good flexibility; When the substrate temperature is lower than 5, the latex paint cannot be constructed; The primer and topcoat should be matched. Causes of Ceiling Cracking - Cracking Caused by Temperature Change Because of the cracking caused by temperature change, the general problem is not big, it only affects the surface, and will not involve the safety of the chandelier. Fixes:

The gap is not large, it is recommended to paste a layer of kraft paper and then brush the finishing paint; If the gap is too large, it is best to cut out a piece of drywall first, polish it into a suitable shape, fill in the gap, and then brush the finishing paint. Reasons for cracking of the ceiling - cracking caused by improper construction, etc. Check the keel first, and then check the finishing materials after dealing with the quality of the base layer. If the chandelier is seriously deformed and damaged, the demolition area can be expanded, and the keel can be repaired according to the normal construction steps after leveling.

Precautions: First, it is best to use stainless steel drywall nails to fix the gypsum board, so that the nails will not rust, and the beauty of the gypsum board can be guaranteed for a long time in the future. Second, the nail hole on the gypsum board is usually treated with anti-rust nail hole putty.

3. The gaps between the two plasterboards should be dealt with well to avoid obvious cracks in the future. Generally, workers will use 90 a glue and gypsum powder mixed to fill the joint. Fourth, after filling the gap with gypsum powder, it is best to paste the anti-cracking tape on the surface to prevent the cracking of the top surface caused by thermal expansion and cold contraction.

Pay attention to remove air bubbles and make the tape and drywall completely and tightly combined. 5. For the ceiling with special shape, the later treatment is very important. Suspended ceilings such as round and wavy need to be repaired slowly.

There are many reasons for the cracking of suspended ceilings, such as carpentry

1. Whether the ceiling keel is a wooden keel or a light steel keel, the wooden keel is more prone to deformation, or the stress is uneven during construction. Cracking is more likely to occur in the later stages.

2. Process problems: whether the whole corner of the gypsum board is used for sealing the gypsum board, rather than splicing (the cost has a certain relationship).

3. Painter: whether there is a strengthened anti-crack treatment to prevent it, and whether there is a caulking paper tape to strengthen the anti-cracking.

4. In the later stage of ventilation, large windows should not be opened for large-intensity ventilation, and the soft breeze effect of small windows is better, which can better avoid such problems.

Suggestion: Do a good job of carpentry foundation, smooth base and uniform stress, woodworking board priming, double-layer gypsum board cover (the cost will increase a lot), which can effectively prevent such problems.

Ceiling cracking treatment method: The cracking of the ceiling coating is difficult to deal with after it is done, and it will leave obvious repair marks. It can be handled in the following way:

If it is only a slight crack, cut the V-shaped gap at the crack and clean it, and then use gypsum putty to fill the compact, sand, and paint. If the crack is large and obvious, it is necessary to shovel off about 10 cm on both sides of the crack until the gypsum board is exposed and cleaned, re-mend the joint, apply caulking tape, scrape putty, and paint.

New house decoration, do a good job of these process details, the ceiling is no longer afraid of cracking!