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    Max ceiling span using 3x2 on 400mm centers

    I've just built a timber garden room inside a big workshop. I have used 3x2 for the ceiling joists on 400mm centres. I have constructed a 'warm' roof consisting of 9mm osb on top of the joists then 60mm PIR then another layer of 9mm osb (no felt or epdm, just a tarp). There is nothing on the...
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