![]() To stop the algae from returning, mount zinc or copper strips near the roof ridge. Also, do this work from the safety of a ladder or from the ground, not by climbing on the roof. Don’t use a pressure washer, which could damage the shingles. ![]() Then scrub the surface gently with a soft window-washing brush mounted on a telescoping extension pole. Bleach will damage foundation plantings, so rinse them well with fresh water before you start and after you’re done. To get rid of it, use a pump sprayer to wet down the roof with a mix of one part bleach to two parts water. While it’s true that algae doesn’t damage roofing, it sure looks bad. ![]() Algae thrives in moisture, so it’s seen most often on shaded or north-facing roof slopes that don’t get a lot of direct sun. Is there anything I can do to get rid of them? The shingle manufacturer says that staining isn’t covered by the warranty because it doesn’t affect the performance of the shingles.Ī: Tom Silva replies: The dark streaks are a type of algae that lives off the minerals in some types of roof shingles. Q: My roof is streaked with black stains. So if your flashing needs any significant repairs, consider hiring a contractor to do it for you. Professional roofers typically cut and shape their own flashing from sheet metal, but the most common flashing pieces also come pre-formed and can be applied without much difficulty using caulking or roof cement.Ī word of warning: Because of the danger involved, I never recommend people do work on roofs unless they are professionals or they’re used to being on roofs and are familiar with the one they’re working on. I can’t say for sure without seeing your roof, but most flashing problems can be patched or repaired fairly easily. Most damage shows up either in flashing that’s deteriorating due to weathering and oxidizing, or in flashing that has come loose. Depending on the style of your house’s roof, you probably have it in the valleys, around the chimney and pipes, and around any dormer windows or skylights. Can you explain exactly what roof flashing is?Ī: Tom Silva replies: Flashing is just material-usually aluminum or galvanized steel-that’s used over joints in roof and wall construction to prevent water seeping in and causing damage. Q: A friend recently mentioned in passing he thought some of the “flashing” on my roof looked as if it were in rough shape. 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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