However, on the edges, the drip edge must compete with the wind. Shingles, along with underlayments and ice and water protector, keep wind-driven rain from harming the roof’s deck. Protect from wind-driven rain: When conditions are serious, the wind pushes water around on a roof. For example, water may cling to the fascia, which may cause rot, or, in severe conditions, a leak into the home. However, without the drip edge, the water sticks to shingles, potentially working its way under the shingles to cause a leak. If the home has no gutter, the drip edge will prevent the water from running down the fascia and onto or into the soffit cavity. A drip edge is designed to take advantage of those forces and, along with gravity, direct water into the gutter. Though your home may not have originally had a drip edge installed, drip edges are now required by most building codes across North America to protect homes from damage.ĭirect water away from fascia: Due to cohesion, surface tension and other forces, water droplets tend to stick to one another and to the surfaces they are on, albeit slightly. Without a drip edge, water may end up beneath the shingles and may cause damage to various parts of the home. Also called drip edge flashing or D-metal, they serve a vital function by directing water away from the fascia and into the gutter. What’s the purpose of roof drip edges?ĭrip edges are metal sheets, usually shaped like an “L,” installed at the edge of the roof.
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