2, and then in parallel to the ground masonry brick, when build by laying bricks or stones to the bottom of the beam slab, it is best to reserve 100-200 mm gap, oblique build by laying bricks or stones roof again after 7 days, in case of cracks at the bottom of the beam slab;
3. Finally, the holes of the hollow brick should be parallel to the direction of the wall, and the thickness should be consistent with the thickness of the wall.
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