Remember the span is from the edge of the supporting walls and not the length of the joist, depending on how you are looking at it. Just in case the joist is sitting on 500mm thick sandstone walls that cuts the effective span to 4M
The joists do sit on a breeze block wall which I think is supportive. So Do I have to be 0.25 of the span away from were the joists sit on the breeze block?
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