These are due to rain-splash-up from the lower roof onto the brick sidewall. More black stains on an exterior brick wall are shown just below. Power washing may be OK on this modern hard-fired clay brick wall as long as the washer does not spray water into the wall cavity through weep holes or other openings. To minimize the chances of damage, we like to start cleaning with the most gentle approach first to see if that's sufficient.
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The reader noted that the dark staining on this brick was occurring only below an area where roof drainage was spilling down the building wall, and s/he asked for advice about how to clean this surface, and whether power-washing would be ok. While a closer on-site inspection or in some cases a forensic lab analysis of a tape lift of the brick wall surface would be needed for certain identification, this looks much like black and green algae growing on the wall surface. See CHIMNEY INSPECTION DIAGNOSIS REPAIR Stains on Brick Exterior Walls Black, dark, or green stains on exterior brickĪ reader asked us for an opinion of the cause of the green and black stains on this exterior brick building wall. Watch out: water damage or soot, creosote, or other blockages of chimneys may make the chimney or flue unsafe. See CHIMNEY STAINS & LEAKS for a catalog of stains appearing on, in or around all types of chimneys. We discuss this chimney and what to do about it These are most likely creosote, or creosote mixed with soot that has leaked through openings in this antique brick chimney and its flue. See EFFLORESCENCE SALTS & WHITE DEPOSITS for steps to cure efflorescence and to remove it from brick or other masonry surfaces.īelow we see black or brown tarry stains on the surface of a chimney visible in an attic. If this soot is from an oil fired heating appliance, a service call is needed. The right-hand photo shows black soot staining at the top and sides of a brick chimney. This is almost certainly efflorescence, a mineral salt left behind as water leaks into and evaporates out of the brick chimney. Brick Chimney Stainsīelow our photograph at left shows white gunk on the exterior surface of a chimney.
Photo above, brick (and stone) staining in the dungeon at Goodrich Castle, Ross on Wye, Herefordshire, England, UK. Stains on Brick Surfaces Article Contents 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. The article distinguishes among common brick stain sources such as algae, bacteria, lichens, moss, soot, sulphur, fungal growth, and other causes of markings on brick. We list the common sources of stains on brick chimneys, walls, walks, and ceilings. This article describes the causes & cures for various types of stains found on brick surfaces both outdoors and indoors. Stains & discoloration on brick surfaces: We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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