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how to install roof flashing (DIY)

  • Author:Ian Ma
  • Release on :2017-01-07
how to install roof flashing (DIY)

What Is Roof Flashing? 
Roof flashing is a material used as a protectant against water leaks or seepage. It's usually made of galvanized metal, but it can also be in the form of aluminum, sheet metal, copper, or even plastic. Galvanized metal or aluminum is considered the best to use as flashing. Aluminum is easiest to install due to how well it bends and is preferred by most DIYers.

Where Do You Install Roof Flashing?
As a protectant, flashing is placed anywhere on the roof's surface that requires extra protection. These areas include anywhere there are intersections or joints such as edges around chimneys, vents, skylights, roof valleys, and soil stacks. If you're having a leak issue in your home, you should first check these areas on your roof for any problems with the existing flashing. At times the nails work loose and the flashing has pulled away from the roof and needs to be reattached, or if it's in bad shape, replacement may be necessary.

Cutting Your Own Flashing
If you're installing your roof flashing in an area that requires covering a larger surface or you would like to make your own flashing and bend it to go around objects on your roof, you can purchase the flashing in bulk. When purchasing it this way, estimate 15 percent over what you think you'll need due to cutting, bending, and waste.
Roof flashing usually comes in rolls and comes in multiple different widths and lengths. If you know you're covering a large area, such as where the roof shingles meet a side wall, you can purchase a width of 14-20 inches to be sure it's well covered, or for smaller areas of your roof they sell width sizes as small as six inches which can be cut further down from there if needed.
Final tips to remember when installing roof flashing yourself: The purpose of roof flashing is to direct any water flow away from any intersections, so when you install it keep this in mind to ensure that it can indeed do its job. Also, with each of these types of flashing materials, the top edge of the flashing is installed in such a way that it should never come in contact with the wood panel or sheathing.