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Flat Roofs

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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.
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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.