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Many thanks Blagard. 650mm is the centre measurement The roof is over a sun room - I've had the structure checked by a chippy who is happy that it will bear the weight of tiles and I have added joist hangers and brackets as 'belt and braces'! A couple of Velux windows are being...

I'm changing a single storey plastic roof for a slate (man made) roof (3600 x 3200mm) with rafters that are approx. 650mm apart. I intended to insert noggins (4x2) at 1200mm points to pick up the internal plasterboard sheets but was advised to put them at 600mm intervals to avoid plasterboard...