Headwall roof flashing is usually installed underneath the siding and roof shingles. However, if your flashing is damaged or needs extra reinforcement, you can add flashing on top of your existing shingles. The corner where a rafter meets a vertical wall is always susceptible to expansion and contraction, which can lead to leaking inside the structure. This is why flashing can be very helpful when installed after the fact. This article explains how to install flashing on top of roof shingles.

Finding the Right Flashing

Aluminum flashing is the most common, but that does not mean you need to use it. Vinyl flashing is nice because it is not susceptible to water damage and rusting. However, vinyl flashing is not flexible as aluminum. This means it is not ideal for homes with rounded or curved walls. If you do use aluminum flashing, you will probably want a color that fits in with you existing roof colors. In most cases, you will not want the look of exposed aluminum. It is possible to paint aluminum flashing, but you will want to do it after installation. Flexing of the flashing will cause the paint to crack off of the aluminum. So, don't try to paint it beforehand. You can find pre-painted flashing in both vinyl and aluminum. These are painted with electrostatic paint, so the finish is more durable.

Installing the Flashing

In addition to the actual flashing, you need 3 basic things for the installation; a hammer, tin snips and roofing nails. Some flashing will have adhesive on the underside of the flashing, but you still need to use nails. The nailing is much easier if you have at least 2 people working on it. One person can firmly hold the flashing in the corner while the other secures the nails. Make sure the corner is firmly pressed down so it is snug. When you get to the corners, you will need the tin snips. The less cuts you make the better, but you will often need to snip the bottom edge of the flashing to enable it to bend around a corner.

For added waterproofing, it is possible to caulk the edges of your new flashing. If you do this, do it after it is painted. It is most helpful if you caulk the upper edge.

This simple project will help protect your roof and insure that your commercial property does not have any leaking.

For a roofing contractor, contact a company such as Bob Behrends Roofing & Gutters LLC.

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