The upper and lower two layers of paper to be strong, and there should be no cracks, gypsum board where there are cracks in the paper, gypsum board will crack from the cracks at the paper. Therefore, the selection of gypsum board, we must choose the smooth surface of the gypsum board, gypsum board and the surface can not have stains, color uneven phenomenon. 3, listening to the selection of gypsum board, gypsum board can be tapped by hand, listen to their voices, such as gypsum board issued a very strong low sound, then the gypsum board texture is very close. Such as gypsum board sound is very empty, then the gypsum board inside the hollow phenomenon, indicating the gypsum board texture is not close and uniform, the quality is not very good. And by hand grit plaster board, but also how to feel the gypsum board flexibility, but also by hand to feel the weight of gypsum board, to determine the gypsum board is good or bad. 4, the size deviation The actual size of gypsum board to be consistent with its provisions, that is, in the selection of gypsum board, gypsum board can also be observed when the actual size of the deviation from the standard size is how much, the deviation is smaller, the better gypsum board. Deviation is too large
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