However, roofing professionals in North America now prefer other materials.Flashing is installed to surround roof features, such as vents, chimneys and skylights.Water should run down the side of the flashing and be directed to the shingles instead of finding its way into the roof deck.According to the Federal Emergency Management Agency, FEMA, improper roof flashing could lead to wood rot and even deck collapse.
So, chances are, if youve been looking into your roof and its flashing, you have questions. What is roof flashing How do you install roof flashing What about repairing roof flashing You can find out here. These are the key types of roof flashing you need to understand. Its a long, single piece of metal that carries water down to the shingles below. Long pieces of continuous flashing will have trouble flexing as the home expands and contracts in the changing seasons. If left as is, it could break or warp and fail to keep water out. Therefore, long pieces have built-in expansion joints so they can move with the home. This ensures that rain always meets a flashing surface that directs it downwards. Plus, it is notoriously tough to install flashing around a chimney. There is another benefit to two-part flashing: When the roof materials naturally expand and contract with weather changes, the two pieces can move, so the whole system stays secure. Multiple pieces of the flashing will be installed in layers with shingles to ensure the water flows away from the wall. Kickout flashing directs water away from the wall and into the gutter. Theyll use tinning snips to cut the sheets and bend them to the exact size they need while on the roof. However, if you walk into a store to buy your own flashing, be careful. There are other types of premade flashing that are not made to be used on roofs and may break if you try to install them on a roof. ![]() The flashing for your plumbing vent needs to be large enough to surround the vent, so it should be just wider than the vents diameter. ![]() Typically, 10- by 8-inch (253 mm x 203 mm) flashing is chosen. Those 8 inches are more than enough to cover the exposure of typical shingles. ![]()
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