Sometimes on drywalls are small cracks or more serious defects, for example, through holes. This phenomenon is quite unpleasant, as the appearance of the finish deteriorates, the plaster and paint slide off.
Moreover, cracks in drywall can eventually increase and lead to deformation of the entire structure, which will be unsafe for people to live. Therefore, do not ignore the flaw, even if it is very small.
The main causes of cracking in drywall
• Strong vibration, for example, when the building is located near a transport line or because of repairs from neighbors (a powerful perforator, etc.). It may cause horizontal cracks in drywall.
• Shrinkage at home, which can cause a lot of cracks, especially in the corners and on the walls and cracks in ceiling drywall. Cracks can not be embedded from the inside only after the shrinkage process is completed.
• Force majeure circumstances (flood, earthquake, storm).
Breach of repair technology
• Usage of cheap construction materials, for example, metal profiles with a thickness of 0.01-0.02 in instead of the recommended 0.025-0.027 in.
• Weakening of the wooden frame: if the crate is knocked off the raw timber, then drying out, the tree arches, then cracks appear.
• Formation of steam or condensate between the rough ceiling and plasterboard. That is why it is recommended to use moisture-resistant drywall, and also to mount the sheets only after the plaster has dried completely and with the windows closed.
• Low-quality carcass fasteners. For example, for mounting it is better not to take plastic dowels, which go in one set with screws. The diameter of the fasteners in relation to the “native” sleeve is too small, the dowel does not stretch well in the hole, the construction begins to sag.
• Installation of drywall without displacement of vertical seams, in one line, “sheet in sheet”.
• When the GKL installation did not seal the seams at the joints between the sheets or seal the seams without the use of a sirloin-stack.
• Incorrect fixing of P-braces – for additional bent “ears,” and not for the main attachment. As a result, the cramp soon begins to be delayed, the integrity of the walls is disturbed.
• Often, cracks appear, if a chamfer was not removed from them without the factory edge when installing the drywall.
• Absence of priming of walls or ceiling from drywall or presence of dust on the surface before applying putty.
If you are sure that the crack is single – then proceed to repair. But if there are signs of further deformation of the ceiling or walls, for example, when the drywall begin to “float” after pressing, it makes sense to remodel the entire surface.
How to fix hairline cracks in drywall ceiling? It is not required complicated moves, but you are likely to need resurface the whole ceiling.
Fixing drywall cracks in the inner corners
(1) Using a 4″ spatula, apply a thin layer of putty on both sides of the corner. Fold the tape to seal the joints along its longitudinal axis of symmetry.
(2) Apply the tape to seal the joint symmetrically to the corner and press it lightly into the putty. You should start from one end of the crack and move to the other. Tear off the excess part of the tape.
(3) Using a spatula of internal corners, immerse the tape in the putty. Hold the spatula at an angle of 45° to the surface of the tape and move it, pressing hard enough against the tape so that a certain amount of putty comes out from under it. Begin from the middle of the crack and move to its ends.
(4) Align the putty with a spatula for internal corners or a 6″ wide spatula. Allow the putty to cure for 24 hours. Lightly * peel the surface of the putty with a sandpaper or wipe it with a damp sponge to remove stains of putty.
(5) Apply a second layer of putty similar to (4).
(6) Apply the third layer of putty the same way as (4).
This method might be used for drywall ceiling crack repair as well.
Fixing cracks on a tape overlapped on joints
(1) Remove some old filler from the damaged area. Using a spatula with a width of 4″, apply a thin layer of putty around the damaged area. Press the tape to seal the joints in the putty using a spatula with a width of 4″.
(2) Align the putty with a 6″ spatula. Allow the putty to freeze within 24 hours. Lightly peel the surface of the putty with a sandpaper
(3) If necessary, apply a second layer of putty the same way as (2) using a spatula with a width of 6″ or 10″.
Fixation of cracks on the corner protective cover
(1) Having cleared from the putty of the corner of the corner protective coating, strengthen its bar with screws and a step of no more than 6″ from each other along the entire length of the crack. Using a spatula with a width of 4″, apply a thin layer of putty on the crack.
(2) (Align the putty with a spatula with a width of 6″.) Allow the putty to harden for 24 hours. Lightly peel the surface of the putty with a sandpaper or wipe it with a damp sponge to remove the putty stains.
(3) Apply a second layer of putty similar to item (2).