Trending Of How To Repair Roof Valley Flashing HD Image Size. Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary. Clear any debris in the roof valley and surrounding area.
Alternate between the two using the brush to loosen larger deposits and brush away dust and the sandpaper to scrub away the rust down to the bare metal. Scrub the rust using a stiff wire brush. Extra nails may increase the risk of leaks.
Scrub the rust using a stiff wire brush.
First your roofer will roughen the area around the hole using a wire brush or sandpaper and carefully clean it. In an emergency or when replacement is too difficult or expensi. Only nail at the edges with only enough nails to hold it in place. The best fix though is to cut a saw kerf into the mortar and install new flashing.