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    Screw length/spacing, flat roof 120mm insulation?

    Hello, this is my first post. What screws do I need for a ground floor flat roof in a sheltered location, please? The construction is 47x175 joists at 400mm centres with joist hangers on one side and 75x100 wall plate the other. Firrings are 50mm to nothing over 3.2m (at side of house)...
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