Why does the cement board crack ?

The reason for the cement board crack as below:

1.       Fiber cementboard as for the decorative materials, it must be stick to the major structure used for the ceiling and partition. Sometimes the major structure cannot meet the requirements in the design and installation part, such as the building lean, crack caused to the distortion because of the uneven foundation. Fiber Cement Board stick to the building surface or the fixed to the light steel kneel, the weak fiber cement board joined part will be cracked basis on the main structure infection.

2.       The main materials for fiber cement board is the cements which is easy to water obsorption,moisture will be swell and dry will be shrink. According to the standard JC/T412.1-2006, the steam-curing swell of fiber cement board is less than 0.5%,compressed steam-curing swell of fiber cement board is less than 0.25%, middle density fiber cement board water absorption is less than 40%, high density fiber cement board water absorption is less than 28%.

3.       Whatever Ceiling or Partition, Fiber cement board must be fixed to Light steel Kneel which makes the fiber cement board joins crack or not.

4.       The joins materials is good or bad makes the fiber cement board joins crack

5.       Design and installation makes the fiber cement board joins crack.