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ROOFING INSPECTION & REPAIR
AMERICAN CEMWOOD ROOFING
BEST ROOFING PRACTICES
BUILT UP ROOFS
CATHEDRAL CEILING VENTILATION
CERTIFICATIONS for ROOFING CONTRACTORS
CHIMNEY FLASHING Mistakes & Leaks
COLD WEATHER ROOF TROUBLE
DECKS, ROOFTOP CONSTRUCTION
EPDM, RUBBER, PVC ROOFING
EXTRACTIVE BLEEDING on SHINGLES
FIRE RETARDANT PLYWOOD
FLASHING on BUILDINGS
FLASHING, ASPHALT SHINGLE VALLEYS
FLASHING, CHIMNEY Mistakes & Leaks
FLASHING, CLAY TILE ROOFS
FLASHING MEMBRANES PEEL & STICK
FLASHING for METAL ROOFS
FLASHING ROOF WALL DETAILS
FLASHING ROOF-WALL SNAFU
FLASHING SIDING DETAILS
FLASHING WALL DETAILS
FLASHING WINDOW DETAILS
FLASHING WOOD ROOF DETAILS
FLAT ROOF MOISTURE & CONDENSATION
Green House or Solarium Roof Leaks
HEAT TAPES & CABLES for ROOF ICE DAMS
ROOF ICE DAM LEAKSbr />
MASONITE WOODRUF FIBERBOARD ROOFING
NOISE CONTROL for ROOFS
PLASTIC ROOFING TYPES
PVC, EPDM, RUBBER ROOFING
ROOF ARCHITECTURAL STYLES - PHOTO GUIDE
ROOF CLEANING RECOMMENDATIONS
ROOF COLOR RECOMMENDATIONS
ROOF DORMER TYPES - PHOTO GUIDE
ROOF INSPECTION SAFETY & LIMITS
ROOF JOB PROBLEMS, RESOLVING
ROOF LEAK DIAGNOSIS & REPAIR
ROOF NOISE TRANSMISSION
ROOF REPLACEMENT SNAFUs
ROOFING FELT UNDERLAYMENT REQUIREMENTS
ROOFING MATERIALS, Age, Types
ROOFING TILE SHAPES & PROFILES
ROOFING UNDERLAYMENT BEST PRACTICES
SADDLE CONSTRUCTION at CHIMNEYS
SNOW GUARDS & SNOW BRAKES
STANDARDS for ROOFING
STRESS SKIN INSULATED PANELS
TEST LABS - ROOF SHINGLE
TREES & SHRUBS, TRIM OFF BUILDING
TRUSSES, Floor & Roof
UNDERLAYMENT REQUIREMENTS on ROOFS
VENTILATION in BUILDINGS
WALK-ON ROOF SURFACES
WARRANTIES for ROOF SHINGLES
WORKMANSHIP & ROOF DAMAGE
White stains on building roofs: this article describes the causes & cures for white stains or white deposits on building roofs. We describe common causes of white blotches or staining on roofs of different materials: asphalt shingle, wood shakes or shingles, stone roofs & slate roofs.
We discuss roof cleaning approaches using chemicals and the most gentle possible means so as to avoid damaging the roof and to reduce the risk of chemical burns or of building or plant damage from chemical wash-down onto lower surfaces during the roof cleaning process. Page top photo of white staining on a roof in Albuquerque NM courtesy of reader Joe Miceli, Clean Right Commercial, and Residential Pressure Washing Email: Miceli571@gmail.com - 2013
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White Stains from Paint Spills on Roofs
First let's get this out of the way. We adapted the following two photographs of white blotchy roof stains from an advertisement in an Air New Zealand flight magazine. At below left the ad section showed white roof staining that was unexplained and that no doubt escaped the interest of the ad copywriter.
But a closer look at the same advertising photograph of two people sitting on a roof (don't ask what they were doing up there in the New Zealand sun) shows (at above right) what is rather evidently a white splash that looks like nothing other than a spill of white paint on the roof. A Kiwi would have figured this out right away.
Below we report on steps to diagnose the source of white stains deposited on an asphalt shingle roof, followed by methods used to remove the white material - probably calcium & magnesium salts deposited from a draining or leaky swamp cooler.
Spilling A/C condensate onto a rubber roof near a drain is not likely to be a roof stain issue but the same spillage on an asphalt shingle or roll roofing surface may lead to algae stains.
Watch out: the apparent "white stains" around the chimney shown at above right are not a roof stain at all. Rather you are seeing an area of "not stain" where runoff metal salts from the aluminum chimney flashing retarded the growth of a roof algae or fungus.
Hard water calcium stains on asphalt shingle roofs
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