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Yes, adjacent shingles in the
same row are simply butted together. Overlapping would create
a bump that would probably be visible.
When you ask about the side
of a gable roof, I assume you are referring to the
"rake" or sloping edge. The answer to your question
is... probably. I've never seen anybody (besides
myself) do anything special to the edge of the shingles at the
rake. I suppose some rain does get driven under the shingles,
but it's of such a small quantity to be of no significance.
However, where I live the
wind HOWLS, such as... right now. It's always windy here, and
as I've been re-roofing this house I've been dabbing a little
roofing tar under the shingle flaps at the rake edge.
Otherwise the wind will pick up the shingles and peel them
off.
It's amazing... we have this
little old garage, and I've seen the shingles literally
flapping in the wind. No, they are not cheap shingles, it's
just too windy here. But it's a good engineering analysis for
me... I can see that the shingles all around the perimeter of
the roof... rake, lower edge, and ridge... are prone to the
most lifting from the wind. So if you really want perfection,
consider dabbing a little roofing tar under all those
shingles. Your roof will last longer, and you can't hurt
anything.
In fact, you could put a spot
of roofing tar under EVERY shingle tab if you wanted, and all
the shingles would stay put forever. But nobody does that
because it's too expensive (i.e. time consuming). But it could
be done. The point is... any shingle with a potential problem
can be held secure with a bit of roofing tar. The easiest tar
to apply is the stuff that comes in caulking tubes, but it's
also the most expensive.
Bruce W. Maki, Editor.
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