I will always install the floor joists. This holds them in place after setting them, so I don’t kick them as I start laying the floor.
It is the floorboards we are concerned with as these can and will move (expanding widthwise), this is why we like a small expansion gap all around so the floor never impedes on the cabin wall causing it to move and dislodge.
This gap is of course covered by the skirting cover strip.
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