All flashed joints, including nondraining roof edges, should be located above the highest water level on the roof. Insure that water drains immediately away from all flashing. Allow for differential movement between base and counter flashing if they are secured to different parts of the structure. At perimeters utilizing curbs or gravel stops, wood nailers must be secured to the roof deck, not perimeter walls. Gravel stop edging requires regular maintenance to insure a watertight condition at the flashing.
Maintenance is the responsibility of the building owner.
Metal base flashing is not recommended, and damage to the roofing system caused by metal base flashing is not the responsibility of U.S. Intec. All expansion joint covers must be elevated above roof level on curbs. Certain construction detail substrates may require the use of a base sheet prior to installation of Intec and Intec Flex flashing materials. Typically, this is necessary when installing flashing over wood or plywood substrates. Section 9 - Flashing Details, require fastening of the flashing materials when they are set in hot asphalt or Matrix SB Trowel Grade.