Properly tying roofing materials in at curbed transitions is an important application method. This detail is often encountered at area dividers, firewalls, and expansion joints. It is required when one section of roofing is being completed and the adjoining area is not being worked on.

The flashing application in the completed roof area should be in accordance with the manufacturers requirements using the manufacturers approved materials. The point of contention is the tie-in point at the opposite end of the curbed transition. Application varies based on the covering material. If a metal cover is applied over the curb, most manufacturers allow their material to be applied to the top of the curb and terminated.