| 摘要 |
A metal flashing, comprising a single length of metal with eleven length-wide folds running parallel to each other and parallel to said flashing's longitudinal edges giving 12 external faces, first said length-wide fold bent at 180 degrees to form a hem, second and third said length-wide folds each bent at 90 degrees in the same direction as said first length-wide fold, fourth to eighth said length-wide folds each bent at 90 degrees in the opposite direction to said first, second and third length-wide folds, ninth and tenth said length-wide folds each bent at 90 degrees in the opposite direction to said fourth to eighth length-wide folds, eleventh said length-wide fold bent at 180 degrees in the same direction as said ninth and tenth length-wide folds to form a hem.
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