What is required for a drip edge on shingle roofs?

The requirement for a drip edge on shingle roofs is that it must be present at both eaves and rake edges. This is important because the drip edge serves to direct water away from the fascia and into the gutter system, preventing water intrusion and potential damage to the roofing materials and the building's structure. Additionally, installing a drip edge on both the eaves and rake edges provides greater protection against wind-driven rain and helps to ensure water runoff flows properly without penetrating the underlying structure.

While there are specific width and material requirements for drip edges, they are not as critical as the necessity of having them installed at both the eaves and rake edges. This feature is particularly emphasized in building codes and roofing standards to ensure long-lasting performance and protection against the elements.