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ROOFING INSPECTION & REPAIR - home
AGE OF ROOFING
ASBESTOS & FIBER CEMENT ROOFING
ASPHALT ROOF SHINGLES - home
BEST ROOFING PRACTICES
BUILT UP ROOFS - home
CLAY TILE ROOFING - home
COLD WEATHER ROOF TROUBLE
DEBRIS STAINING on ROOFS
DECKS, ROOFTOP CONSTRUCTION
EPDM, RUBBER, PVC ROOFING
FIBER CEMENT ROOFING
FIBER-WOOD & FIBERBOARD ROOFING
FIRE RATINGS for ROOF SURFACES
FLASHING on BUILDINGS - home
FLAT ROOF MOISTURE & CONDENSATION
HAIL DAMAGED SHINGLES
HEAT TAPES & CABLES for ROOF ICE DAMS
HOT ROOF DESIGNS: UN-VENTED ROOFS
ICE DAM PREVENTION on ROOFS
ROOF DIAGNOSIS & REPAIR - home
LOW SLOPE ROOFING - home
MASONITE WOODRUF FIBERBOARD ROOFING
MEMBRANE & SINGLE PLY ROOFS
METAL ROOFING - home
MODIFIED BITUMEN ROOFING
NOISE CONTROL for ROOFS
PLASTIC ROOFING TYPES
PVC, EPDM, RUBBER ROOFING
ROLL ROOFING, ASPHALT
ROOF ARCHITECTURAL STYLES - PHOTOS
ROOF CLEANING RECOMMENDATIONS
ROOF COLOR RECOMMENDATIONS
ROOF INSPECTION SAFETY & LIMITS
ROOF NOISE TRANSMISSION
ROOF REPLACEMENT SNAFUs
ROOF SLOPE DEFINITIONS
ROOFING CONTRACTOR SELECTION
ROOFING MATERIALS, Age, Types
SLATE ROOFING - home
SNOW GUARDS & SNOW BRAKES
STAIN DIAGNOSIS on ROOFS
STANDARDS for ROOFING
STRESS SKIN INSULATED PANELS
TEST LABS - ROOF SHINGLE
TILE ROOFING - home
TRUSS UPLIFT, ROOF
TRUSSES, FLOOR & ROOF
UNDERLAYMENT REQUIREMENTS on ROOFS
VENTILATION, ROOF SPECIFICATIONS - home
WALK-ON ROOF SURFACES
WARRANTIES for ROOF SHINGLES
WIND DAMAGE to ROOFS
WOOD SHAKE & SHINGLE ROOFING - home
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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