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Firstly many thanks for your reply noseall, unfortunately my lack of knowledge on roofing has led to not using correct terminology refering to length and width instead of span? the span is actually the larger dimension 4m so am I right in saying that this alters your response? If so how??

Hi, building a small extension to the rear of my property, now up to wall plate hight and unsure as to what the regs are regarding spec of timbers I need? The roof is monoo pitch with a shallow fall, width 2.9m, length 4m. Does it require a purlin and if so what size, also what size will other...