 |
|
How
not
to
weave
a composition
shingle
valley
|
|
The
keyways
between
the
shingles
are
at right
angles
to the
flow
of water
and
trap
debris.
Note
lifted
shingle
tabs
and
debris
accumulation.
(See
A
well-woven
valley).
|
|
How
not
to weave
a composition
shingle
valley
|
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