Proper roof flashing installation is an important feature that allows rainwater to run off both the house roof and porch roof properly. The flashing should be installed before the roofing material. For a successful installation follow these simple steps:
- Measure: Make careful measurements and purchase your flashing from us here at Music City Roofers. The most popular flashing material choice is Aluminum. However, you can choose tin, galvanized metal, sheet lead and premium copper. Flashing normally comes in 10-foot lengths, so purchase enough to cover the entire project plus a little left over just in case you made a mistake cutting or measuring.
- Prep: Remove all materials down to the roof planking before you try installing flashing, make sure the valley area is clean and dry. If attaching a room addition to an existing roof, remove a line or two of shingles on the original roof.
- Cut & Bend: Cut the flashing to the length you need. If you’re going to tie in two roofs, bend the flashing in the middle using a metal break tool according to the roof joining angle. Flashing is normally eight inches wide, so make sure each roof has four inches of flashing material.
- Lay it down: Place the flashing where you need it and line up the middle of the flashing with the valley grove. If tying in two roofs, make sure half of the flashing is on both sides.
- Secure: You’re going to need heavy duty staple gun to secure the flashing to the roof planking. Apply staples one-inch from the flashing edge down each side of the material.
- Replace Roofing: When you’re done installing the flashing in a valley, replace the roofing material to ensure a waterproof barrier. Finish the roofing for the two tie-ins also installing fascia board.
- Tar Application: For extra added protection against water use a little roofing tar as back-up before installing shingles.
Instead of using one long one, single pieces of flashing can be used if they overlap by about two inches. If you plan to join multiple pieces of flashing by soldering these together, don’t use aluminum. Aluminum cannot be soldered so you need to use another material like tin or galvanized metal.