Why are small gaps left behind the girders mounted in walls?

Question: Why are small gaps left behind the girders mounted in walls?

Small gaps are left behind the girders mounted in walls to allow for expansion and contraction of the building materials. Building materials can expand or contract due to changes in temperature or humidity. If there were no gaps, the expansion or contraction of the materials could cause the girders to warp or buckle, which could damage the structure of the building. The gaps provide space for the materials to expand or contract without causing damage.

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