COP v3.0:flashings

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This section contains acceptable and better flashing details for most possible junctions, but does not require the use of welting, seaming or crimping, which are used with flashing standing seam cladding. These techniques are described in Standing Seam Cladding, but they can be used to substitute any sealed lap in lieu of mechanical fastenings. 

Flashings in this Code does not contain specific details of the interface with alternative roof cladding materials, such as butyl rubber, but the same good practice is applicable.