box profile

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    Confirmation before purchasing materials for decking/pergola roof

    I'm about to buy the materials for my decking roof, but just wanted to get a quick sanity check please, before doing so. I'll be buying box profile 32/1000 sheets and some purlins to support them. My decking roof comprises 2x4 rafters of length 4450mm spanning a roof of 7210mm at 525mm centres...
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