Keep water out of your home and running down the roof where it belongs with appropriate use of step flashing. Step flashing is used where a roof meets a wall, to cover the junction of those elements, preventing leaks. Flashing is a strip of metal, usually aluminum, about 8 inches long, and bent at 90 degrees with each side at least 5 inches wide. On a wall to be covered with wood, cement board, vinyl or metal siding, the step flashing, and associated roofing, must be installed first, so the siding can cover the top of the step flashing on the wall.
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Install the carport roof panels, starting from the outer end of the carport roof frame. Install the final section of panels starting at the roof transition, and overlap these panels at least 4 inches onto the final section of carport roof panels. This ensures that water sheds correctly. If you have problems with your porch roof leaking, it is often due to poorly installed flashing or a lack of flashing altogether.Flashing is a thin strip of weatherproof material installed to deflect water from seals and joints to protect your porch and home from damage.
1
Slice along the bend line about 4 inches into the first piece of flashing at the bottom of the roof with tin snips.. Fold the roof side of the flashing down over the facing board along the roof line. Bend the vertical edge at about a 45-degree angle to make a tab to 'kick out' water, away from the wall and over the bottom of the roof. Nail the flashing to the wall with two galvanized roofing nails and a hammer.
2
Lay a shingle over the step flashing starting at the roof edge. Fasten that shingle with two galvanized nails at the top, then cover the top of it with another piece of step flashing, nailed to the wall. Work up the roof in steps, covering each end of flashing with a shingle and each end of a shingle with flashing, so there are no open seams. Alternate flashing and shingles to the roof peak.
3
Cut a piece of flashing along the bend line about half the length of the strip to flash the peak of the roof. Bend the roof edge of the flashing down over the peak and nail the wall side to the sheathing extending past the peak. Install a reverse peak flashing for the other side of the roof, so the two wall edges overlap in an 'X.' Nail step flashing at a peak so the roof side extends over peak flashing on the roof.
4
Cover both sides of the roof with step flashing and shingles from the eave to the peak. Caulk the joints of flashing at the peak.
5
Install siding on the walls down to the flashing. Leave a 1/4-inch gap between the step flashing and wood siding or cement board. Nail J-channel for vinyl or metal siding onto the flashing; follow the directions of the siding manufacturer for specific installation of these materials.
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References (7)About the Author
Bob Haring has been a news writer and editor for more than 50 years, mostly with the Associated Press and then as executive editor of the Tulsa, Okla. 'World.' Since retiring he has written freelance stories and a weekly computer security column. Haring holds a Bachelor of Journalism from the University of Missouri.
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Haring, Bob. 'How to Install Step Flashing Under Siding.' Home Guides | SF Gate, http://homeguides.sfgate.com/install-step-flashing-under-siding-21255.html. Accessed 19 February 2020.
Haring, Bob. (n.d.). How to Install Step Flashing Under Siding. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/install-step-flashing-under-siding-21255.html
Haring, Bob. 'How to Install Step Flashing Under Siding' accessed February 19, 2020. http://homeguides.sfgate.com/install-step-flashing-under-siding-21255.html
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Disclaimer:Roof flashing should always be installed by professional roofers, who understand best practices, safety requirements and the building codes and laws in their area. These instructions are only to help homeowners understand what to expect from their roofing professional.
Step flashing is the most time-consuming of all flashing jobs on the roof because you must complete it step-by-step as you shingle up the roof. There are a few general best practices you need to know. First, step flashing must be installed before the siding, so that the siding can cover the top of the flashing. If this is a repair job, the siding must also be removed and replaced with the flashing. Second, step flashing needs to extend 8 to 14 inches above the shingles, according to the National Roofing Contractors Association (NRCA).
Also, before you start installing your flashing, you need to look to see if the wall in question has a corner on the roof face, as in the image below.
If it does, follow our first installation procedure. If it doesn’t have a corner, and simply looks like the image below, follow the second installation procedure.
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