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In timber-frame structures

The movement in a timber frame structure caused by joint settlement, shrinkage, and deformation from loads is known as differential movement. It is important that consideration is taken at design stage of differential movement and its effect on the building. Hard points (e.g. eaves, heads, heads, portal frames, etc.) are specific areas where this movement should be allowed for. The level of differential movement is proportionate to the building: the maximum movement i experienced at the top of the building and the minimum at the bottom.

Therefore, the level of protection required against differential movement is relative to the height of the building. Some provisions can be made for timber frame components to reduce the amount of differential movement, such as:

Protecting timber components once delivered to site.
Minimizing the amount of cross-grain

Differential movement