Likewise, a roof system that isn’t vented properly and allows heat to build up beneath the roofing has a shorter life than one that is vented. The side facing your worst weather typically fares worse than the leeward side. On the other hand, that same roof in an unshaded area facing due south will take the full brunt of the sun, which is hard on any roof.Īctually, factors other than pitch have a greater effect on shingle durability. On one hand, a steep roof is less likely to collect leaves and other debris that hold moisture against the shingles and invite the growth of moss and algae. Q: Everything being equal (ventilation, shingle type, climate, etc.), which roof will last longer: one with a steep pitch or one with a shallow pitch? Seems to me a steep hillside erodes more quickly than a low slope, so I’d think that roof shingles would wear out more quickly on a steeply sloped roof.Ī: Tom Silva replies: It’s difficult to say. If these problems are widespread, it’s a sure sign that you need to call a roofer. While you’re in the attic, scan the underside of the roof sheathing for any new signs of water staining since the last inspection, as well as any soft or moist spots, which tend to show up after a heavy rain. If you see little pinhole spots of light, the flashing is shot-another indication that the roofing might not be in good shape. Also, go into the attic on a sunny day and, with the lights off, check the underside of the chimney and the stack vent. Here’s what to look for: numerous shingles that are lifting up, cracked or missing, with curled edges, or with smooth dark areas, which indicate that the protective granules have worn off. Binoculars are easier and a lot safer, and you can spot most problems from the ground. But younger roofs can fail too, so it’s a good idea to inspect a roof at least once a year. If your roof is more than 20 years old, there’s a good chance it’s due for replacement. Q: How do you know when an asphalt shingle roof needs replacement? Are there clues to look for before telltale water stains appear on our plaster ceilings?Ī: Tom Silva replies: There are several clues, and the biggest one is age.
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