How should a drip edge be applied at the rake?

How should a drip edge be applied at the rake?

• A. Over the underlayment
• B. Directly to the roof sheathing
• C. Between the two courses of shingles
• D. Beneath the roof sheathing

Answer: (A)

Water control at roof edges relies on flashing being positioned to shed water away from the deck. At the rake, the drip edge should be installed over the underlayment. This placement lets water flow off the shingles onto the underlayment and then onto the drip edge, which channels it away from the roof edge into the gutter or runoff. If the drip edge were placed under the underlayment or directly on the sheathing, water could wick behind the flashing, potentially leaking into the roof structure and fascia. Installing it between two courses of shingles would also prevent proper shedding and edge protection. So, the correct approach is to install the drip edge over the underlayment at the rake.

Water control at roof edges relies on flashing being positioned to shed water away from the deck. At the rake, the drip edge should be installed over the underlayment. This placement lets water flow off the shingles onto the underlayment and then onto the drip edge, which channels it away from the roof edge into the gutter or runoff. If the drip edge were placed under the underlayment or directly on the sheathing, water could wick behind the flashing, potentially leaking into the roof structure and fascia. Installing it between two courses of shingles would also prevent proper shedding and edge protection. So, the correct approach is to install the drip edge over the underlayment at the rake.