2012 International Residential Code (IRC) requires drip edge at the eaves and rake edge of the roof. The IRC has required drip edge since the 2009 edition.
- Apply directly to deck along eave unless otherwise specified by local codes
- Apply over underlayment along rake
- With drip edge-shingles could be flush to edge or overhang ¼” to ¾”
- Drip edge is a requirement for extended warranties
Drip edges provide efficient water shedding at the rakes and eaves and protect the underlying wood from rotting. Drip edges should be made of a corrosion-resistant material that extends approximately 3” back from the roof edges and vends downward over the decking. Apply the drip edge underneath the underlayment along the eaves and over the underlayment on the rakes. The use of a drip edge may be required by local building codes.
On Rake Edge:
- All regular underlayments go under the drip edge.
- When a style D drip edge is used shingles can be flush with the drip edge or overhand by ¼” to ¾”.
- When started shingle is used on the rake edge it should also overhang the drip edge ¼” to ¾”
- All underlayment goes on top of drip edge unless otherwise specified by local codes.
- Shingles should overhang the drip edge ¼” to ¾”.
- Shingles can be flush with the drip edge if D style.