Drip edge is the flashing that protects the edges of your roof, both the eaves and the gable ends. It is required by the 2012 International Building Codes (IBS) for shingle roofs, and you should make sure that it's properly installed with any new roof you get. Optional for years, drip edge is now required by the International Building Codes. This is great because it protects the wood structure underneath your roofing shingles, an area of the roof you can't see … but one that's prone to water damage and wood rot.
The concept of flashing is easy, but remembering the different names used for flashing was a huge challenge when I started my handyman business. It's why Home Tips focuses on the concepts you need to understand your home.
Building Code Specifications for Drip Edge
Another benefit of having drip edge added to the building codes, are the standards defined. If it doesn't look right to you, ask your roofer to explain how it's installed. It comes in 10 foot lengths, and several colors (see what Lowe's sells) to match your roof's shingles. One of my handyman technicians made a roofer re-install the drip edge once, because they used small, leftover pieces leaving too many seams vulnerable to leaks.
- Adjacent pieces must be overlapped a minimum of 2 inches (51 mm).
- The metal must extend a minimum of 0.25 inch (6.4 mm) below the roof sheathing and extend up the roof deck a minimum of 2 inches (51 mm).
- Each piece must be fastened to the roof deck at a maximum of 12 inches (305 mm) apart.
- Where the drip is installed is very important:
- On the eaves, the roof underlayment goes over the drip edge.
- On the gables, it goes over the underlayment.
The building codes state that shingles can be flush with the drip edge, unless the shingle manufacturer specifies something different.
Drip Edge Confusion Online
We're thrilled to get so many visitors searching for drip edge. What I wish I knew is what led you to search for this term (you can leave a comment below) so that I can provide even more relevant information. When searching Amazon I was amazed at the variety of products that were returned for the term drip edge, so let me explain:
- Drip edge is installed on your roof, under the shingles, and should be installed with your roof. It's one way to evaluate the quality of roofing estimates – does it list drip edge along with other materials like ice and water shield? The product is purchased by roofers at building supply companies where they buy roofing shingles. They purchase drip edge in quantities of 500 ft versus the single 10 ft piece found on Amazon (not recommended due to possible damage in shipping).
- Drip cap is similar, sitting on top of doors and windows. The 36 inch length was the first clue in my Amazon search. A drip cap directs water away from house the same way drip edge does. Often made from wood, drip caps can rot which is why you might need to buy a replacement like the aluminum drip cap below.
- Rain diverters sit on the roof. They direct water away from one part of the house, typically away from exterior doors so noone gets wet when entering or leaving your house. Rain diverters are a cheaper solution than installing gutters. Read The Family Handyman's directions for installing a rain diverter.
Note: While I'm familiar with all of these products from my eight years running a handyman business, I didn't recognize the brands selling these products online. So here's how I vetted these brands to confirm their products are credible because I have run into problems with products manufactured in China that I won't recommend.
- Amerax is part of Euramax, a family of companies manufacturing many different types of home products from aluminum, steel, vinyl, copper and fiberglass. Their commitment to solving rainwater problems is demonstrated on their website.
- M-D Building Products has been in existance since 1920. One of their focus product areas is weatherization for the home, including the drip cap shown above, other sheet metal products for the house and weatherstripping.
Get more homeowner tips on roofing and gutters here …