![]() ![]() STAINS on/near CHIMNEYS Catalog of Types of Stains on Building Roofs, Surfaces, Walls ![]() See details at SOOT STAINING (chimneys) and also see Probably more important than the stains is that this chimney has lost its cap, risking damage to the flue, possibly damage to heating equipment, risking heater malfunction that could be unsafe. Our photo below shows brown stains below a metal roof chimney. These include tree shade caused moss, tree-shade caused lichens growth on a roof, or dark stains on roof coverings caused by organic debris such as leaves and sticks that fall onto and collect on the roof surface (photo at left). If you see a roof stain that develops only in limited areas of a single roof slope (photo above) look for a relation between the stained area and a proximate cause such as a sooty chimney top or a tree that shades that section of the roof or drops organic debris onto it. Have longer lasting protection than others due to aįor distinguishing between an algae growing on shingles and a fungus growing on roof shingles, building or environmentally-caused roof staining, or other causes, here are several approaches: Proximate cause roof shingle stains: tree debris Resistance are usually for less than 10 years since the protectionĮnds when the mineral washes away. When the shingles get wet, the zinc or copper is Zinc or copper granules are mixed in with the colored stone Increased use of crushed limestone as a filler material inĭurable shingle, but the calcium carbonate in the limestone Prevented moss, lichens, and algae from growing on those shingles.Īs stated in Best Practices Guide to Residential Construction (Steve Bliss, J Wiley & Sons) :Īlgae or fungal growth used to be limited to warm, humidĬlimates, but now this can be seen on houses as far northĪs Canada. The aluminum salts washing off of the fan cover Installed down-roof from an aluminum attic vent fan cover. Streak of "clean" roof shingles that lack the stains on the upper roof near its left edge? Those shingles were ![]() The upper roof, shaded by the large tree in the page top photo, was also moss covered. In the photo shown at page top, the black stains on the lower roofs are bleed-through orĮxtractive bleeding. These stains, cause ,and cure are discussed and diagnosed The red stains on the roof shown at left are almost certainly from rusting metal, perhaps rusty chimney flashing. The remedies for and means of preventing stainsīy proximate cause of a roof stain we mean that it's worth noticing the location of a stain on a building and the location and nature and condition of nearby building and site features that may be the cause of the stain.įor example, if you see stains around or below a chimney, take a closer look at the chimney as the stain source. But there are other roof stain colors and causes. Of asphalt, dirt, soot, or organic debris. Here we give an index of all sorts of roof stains and what causes them.ĭark black or brown roof shingle stains are often caused by black algae, bleed-through or extractive bleeding There are many sources of roof staining and they vary in significance, from cosmetic to harmful to the roof. How to Distinguish Roof Stain by Type of Proximate Cause, Color, Source We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. For each stain color and type and cause we link to articles giving additional details about cause and remedy for that roof stain problem. This article gives a photo-catalog of types of stains that show up on roof surfaces and lists their common causes. Or white stains appearing on roof shingles and on other building surfaces. This document tells readers how to identify & explain the most-common causes of black, brown, red, gray, green, Knowing the cause guides us to knowing the cure for unsightly black, brown, green, red, rust, or other colored stains on building roofs. Stains on roofs have a variety of causes, but noticing the stain color, its location, and the relation of he roof stain color and location to roof components such as chimneys, flashings, and the stain relation to roof conditions (pitch, shading, nearby trees, debris, roofing materials) will usually lead to a quick reliable diagnosis of the cause of the staining. Roof discoloration & stain diagnosis, cure, prevention & advice for trimming trees away from buildings. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest. ![]()
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