Mastering Roof Inspections: Flashing, Part 6

The IRC calls for flashing to be installed at areas where the roof changes pitch.

This would include areas where the roof changes from steep to shallow, and has either a concave…

…or a convex shape.

Another situation might be on a bonnet roof, as you see here.

Another common condition is where a porch roof meets a steeper home roof.

In looking at different roofs with changes in pitch, you won’t always be able to confirm the presence of flashing. The roof edge is the best place to look.

If you can’t confirm the presence of flashing in areas that you know should be flashed, it’s a good idea to mention that in a disclaimer in your inspection report. 

DRIP EDGE 

“Drip edge” is flashing installed around the edges of the roof to prevent roof leaks and wood decay.

You’ll see various flashing profiles used as drip edge. The type of profile you see isn’t as important as whether the flashing keeps the water out. Drip edge is not required by the IRC, and lack of it is not a defect; it’s just a good idea.

Unless a lack of drip edge appears to be an immediate or potential problem, you wouldn’t typically recommend that it be installed on an existing roof, but you might include in your report an explanation of the purpose of drip edge, and mention that none was installed on the home.

Generally, underlayment should overlap the drip edge at the lower eave, and drip edge should overlap the underlayment on rakes.