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    Korniche roof lantern upstand thickness

    The korniche guide says to have the upstand 69mm wide. I have built mine with 44mm PSE frames filled with 25mm kingspan and 18mm OSB internally bracing them. It is externally lined with 11mm OSB - it is 55mm wide, which fits the korniche lantern eaves rails exactly (with the 6mm overhang). I'd...
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