Flat Roofs
Problem:
Because no gravel stop was
installed,
the asphalt flood coat and the roofing
gravel are migrating down the face of the shingle roof.
Solution:
Install a 3/4-inch-high sheet-metal
gravel stop,
with a flange at least 4 inches wide,
under the edge of the built-up roofing. The stop should also
include a bottom flange, extending at least 4 inches over the
top course of asphalt shingles.
Problem:
Edge flashing was not
nailed.
The installer forgot to attach the edge
flashing to the roof before the built-up roofing was installed.
When the roofing material later contracted, it pulled the
entire flashing away from the edge of the roof.
Solution:
Don't forget to fasten the
flashing
to the sheathing or nailer with nails or
screws.