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Question:

Calcium silicate board surface putty Why crack?

Calcium silicate board surface putty Why crack?

Answer:

1, improper handling of deformation joints: in the deformation of the calcium silicate board ceiling no seam, the entire plate directly connected. Although some of the deformation of the seam, but the deformation of the practice is not right, only in the panel at the seam, and the keel is not broken, the deformation of the structure under the action, calcium silicate board is easy to crack. 2, the wall at the junction of improper handling: not in accordance with the requirements of the node set construction, but in the calcium silicate board and the junction of the wall directly with the stopper putty full scraping, and some also use copper tape paste to strengthen, leaving no Shrink the space, causing the crack. 3, improper storage of the plate: the plate in the installation and construction of wet moisture, resulting in deformation, in the natural dry conditions after construction, resulting in shrinkage, cracks. 4, hanging keel installation spacing is too large: part of the keel of the mechanical properties did not meet the national standard indicators, the plate after the installation of a greater degree of deformation. Keel and plate when the connector is not staggered, it is difficult to avoid stress concentration. The whole plate is installed in different directions at the same time on the screw fixation, so that the sub-stress within the plate easy to crack.
Usually in the board and board transfer place, very prone to cracking. And then the construction of such a transfer of the time, we must do anti-cracking treatment. If cracking has occurred, it will need to be shoveled along the cracks, and then fill with a dry coating, while the bandage to play a role in anti-cracking.
First, the first clean seams at the end of the dust, after cleaning, in the seams sweep a white latex, can achieve better anti-cracking effect. (Figure 1) Second, with a scraper putty putty evenly embedded in the seam mouth. (Figure 2) Three, and then immediately wiped the self-adhesive fiber mesh belt, and the net completely affixed to the putty, and then a layer of putty on the net belt putty. (Figure 3) Fourth, in order to further strengthen the anti-cracking effect, to be a putty completely dry (about 5 hours, the case of wet weather will increase), with a putty in the thin layer (slightly wider than the seam chamfering area and slightly higher On the board) (Figure 4) Five, until the putty completely dry, with sandpaper on the surface of the caulking, sanding, so that the entire board smooth.

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