- Q.Is the self-adhesive
strip on standard asphalt shingles adequate for
occasional 100-mph winds, or should extra roofing
cement be applied under each
shingle?
A.Paul Fisette,
director of the building materials and wood
technology program at the University of
Massachusetts in Amherst, responds:
Wind-resistant shingles are recommended in areas
subject to hurricane-force winds, which are defined
as winds in excess of 75 mph. Typical asphalt roof
shingles have a UL 997 rating and come with a "wind
resistant" label right on the bundles. However,
this UL 997 listing only tells you that the wind
testing was conducted in a certain way; it
doesn’t refer to a specific windspeed
resistance. In fact, most shingle manufacturers
limit their warranties to wind speeds between 60
and 80 mph.
Since you are in an area subject to even
stronger winds, you may want to take extra
measures. Shingle manufacturers recommend that in
windy locations, you place a dab of asphalt cement
the size of a quarter at the bottom corner of each
tab of a standard three-tab shingle (a total of six
dabs). Double-nailing (for a total of six nails per
shingle) is also a good idea. And it’s
best, if possible, to install the shingles in warm
weather so the self-sealing mechanism works
properly.