Securement of flashing at outside corners proves to be a difficult task. The adherence of the flashing material can be compromised due to the angle of the transition.
The removal of water from the roof surface is critical to the success of the roof system and warranty compliance. The most common method of water removal is through interior roof drains.
One of the most critical details on remedial applications is the tie-in detail between the existing waterproofing application and the new waterproofing application.
Applications of flashing at cast-in-place penetrations (such as pipes or vents) are similar for both vertical and horizontal waterproofing applications.
The most important aspects of curb details are that they are designed at the proper height and there is sufficient termination of the flashing material.
Flashing terminations may be mechanically secured using metal termination bars or by stripping off into a recessed form of a reglet design. However, it is a best practice to follow termination designs that are in accordance with the material manufacturer's recommendations.
In situations where the parapet wall extends above the maximum 12-inch flashing height and wall waterproofing is required, there are several options. In the case of concrete or masonry walls: waterproofing can be provided by installation of a membrane covering, a metal covering or a waterproofing coating.
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