To ensure the edge of the flashing does not mechanically remove protective coatings on the cladding, there must be enough clearance between the edge of a vertical flashing, or a notched flashing, and the cladding. Similarly, the edges of cladding running parallel to flashings, such as at a window head, should have clearance to avoid mechanical damage and allow drainage.

Having the lower edges of flashings apart from the surface they are covering helps to improve the cut edge durability of the flashing. Kick-out barge details are preferred to bird’s beak barge details for the same reason. The size of the clearance is not critical, but typically it is more than 5 mm.


Window Head

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Clause Number: 
Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

Deleted copy about ground clearance, it is now discussed in more detail in the sub-clause Ground Clearance.

Draft Clause: