The main ceiling material of the ceiling is gypsum board. The gypsum board is light in weight, easy to construct and price. However, when using gypsum board as the ceiling, it is necessary to pay attention to reserve expansion joint to avoid cracking of thermal expansion and contraction. So, how to make a gypsum board ceiling expansion joint ? What is the gypsum board cracking treatment method? Let's take a look at the related content of the decoration home network Xiaobian!
First, how to make gypsum board ceiling expansion joint
Expansion joint conditions: Expansion joints should be provided for the gypsum board ceiling over a distance of more than 12 meters. Double-layer gypsum board ceilings need to leave 10-20mm seams, the length of the joint is 30-50mm, and the distance between the edges of the expansion joints and the hanging ribs is not more than 300mm. The single-layer gypsum board ceiling is lined with the side keel and the left side is left with a 10-20mm seam. The width of the wall exceeds 12m, the left and right sides of the wall panel and the three sides of the ceiling, and the four sides of the southeast and northwest of the ceiling are to be left with expansion joints. This joint should be treated with elastic sealing paste or decorative beading.
Expansion joint method: fix one side vertical keel, and nail one layer, two or three layers of 12mm gypsum board on the vertical keel, then install the other side vertical keel back to back at a distance of 10mm; Position, leave a 12.5mm gap to install the gypsum board on both sides of the wall; cut a length of expansion joint fittings with the same length as the control joint, according to the different types of expansion joint fittings, use quick-drying glue or self-tapping screws, respectively The expansion joint fitting is fixed at the expansion joint of the gypsum board; the joint treatment is performed with the caulking plaster; the rubber strip in the expansion joint fitting is extracted.
Second, gypsum board cracking treatment method
Cracks in the gypsum board ceiling are closely related to the season, construction and materials. There are two main problems that are likely to occur in gypsum board ceilings. In one case, about half a year after the completion of the ceiling, cracks began to appear at the joints of the gypsum board. The solution is to ensure that the gypsum board is fixed under stress-free conditions when the gypsum board is suspended. The distance between the keel and the fastening screws should be strictly in accordance with the design requirements; when the whole is full of putty, pay attention to the fact that the putty should not be too thick. The second case is an irregular wave pattern on the ceiling. The surrounding grille or the four corners are not flat, or the wood moisture content is large and shrinkage deformation can cause unevenness of the arch; in addition, the keel joint is uneven and has a hard bend, and the distance between the boom or the hanging rib is too large to deform the keel, which may also cause the ceiling to be uneven. The top of the wooden boom is split and cracked when the boom is used as the boom, which will cause irregular wave deformation. For larger ceiling projects, use light steel keels as much as possible.
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