When attaching an Annexe, they come with U channels. Fix onto the side of your cabin using drilled slots, screws, etc. to allow movement.
If the Annexe is being fitted to a cabin, make slots for the post support’s screws, thereby allowing for expansion and contraction.
The U Section post is fixed to the wall with screws or bolts as required.
To know how to make the slots on your U section, please replicate it to the image below;
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