The fabric sofa bulges up, what s going on

It may be that the cement stability of the cement mortar is unqualified or the floor mortar has a large area of quicklime, and the cold expansion is serious, resulting in the floor convex cracking, and the second possibility is that the mortar layer becomes an aquifer, and the water is frozen by the ice volume expansion. >>>More

This situation is rare, generally found in winter, and regardless of the building and bungalow, the main reason is that the temperature difference between indoor and outdoor is too large, when the room temperature is very high in winter, the floor tiles and the concrete under the bottom maintain a relatively stable state, if the cold air is too involved, such as the door and window open for too long, and then thermal expansion and contraction, the shrinkage coefficient of the floor tile and the concrete is not the same, so that the floor tile and the concrete are separated, resulting in the floor tile bulge. >>>More

The skeleton material inside is a synthetic board, which will deform when exposed to moisture. >>>More

It may be that there is not enough material when applying the tiles, or it may be caused by the tiles being blistered and the cement underneath sagging.

Buy cushions, of course!

1.Traditional bamboo or straw cushions. >>>More