Where is drip edge flashing typically installed?

Drip edge flashing is an essential component in roofing systems, and its proper installation is crucial for preventing water infiltration and damage. The correct placement of drip edge flashing is under the roofing felt. This positioning allows the drip edge to effectively direct water runoff away from the roof edge and into the gutters. By placing the flashing beneath the felt, it ensures that any water that might seep under the shingles will be guided back out and away from the underlying structure, thus protecting the roof deck and preventing rot or mold.

While the options related to positioning above the felt or on top of the shingles may appear plausible, such placements would not allow for effective water management. Installing drip edge flashing on top of the shingles could trap moisture underneath, leading to potential leaks and damage to the roofing materials. Similarly, positioning it along the rakes without proper integration into the broader roofing system could negate its primary function of channeling water appropriately. Therefore, the under-felt installation is the most effective practice for ensuring the longevity and functionality of the roofing system.