The right kind of roof and ventilation can keep you cool and dry By John D’Annunzio, Columnist, KennettTimes.com Let’s talk about the most commonly used shingles: organic asphalt shingles. They last about 18 to 20 years. The only problem with them is that in time they can cup in very humid and wet climates. Try to purchase a shingle with an algae resistant coating.  There is an asphalt...