Here are some clues to follow.
White spots on roof shingles.
If the streaks don t bother you or you re not ready to invest in a new roof install zinc or copper strips available at roofing centers along the top course of shingles.
White or less black roof surfaces may also be found below copper or aluminum flashing whose salts run down the roof surface in wet weather preventing algae or moss growth and leaving a white area on an otherwise stained roof surface.
It s a combination of algae and fungus and usually has a light mint green color.
Consumer reports reveals the best roofing shingles from its comprehensive tests including 3 tab architectural and multilayered architectural asphalt shingles.
Set the garden hose on the spray setting with the highest pressure water and hold the nozzle close to the shingles when rinsing.
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White stains on roof surfaces may be from wash down of pigments in paint on surfaces above the roof such as a gable end or dormer wall.
The area can be cleaned.
It doesn t trap as much water against the surface of the roof as moss but it can be acidic and has strands that can penetrate into the shingles.
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Owens corning supreme 33 33 sq ft shasta white 3 tab roof shingles.
They re asphalt shingles not wood.
This will remove any stains that were loosed up by the oxygen bleach.
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Browse owens corning roofing shingles by color shingle lines price features wind resistance and or warranty to find the right roof for your home.
Allow the oxy bleach mixture to sit on the shingles for about 15 minutes.
Metal salts washing down the roof surface from metal chimney flashing are often enough to kill of biological organisms that otherwise stain various roof surfaces.
Roof shingles consist of a series of individual overlapping components that when laid together in rows or courses starting at the bottom edge of a roof form a barrier designed to repel water snow and ice.
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The white stains shown on this wood shingle roof are in fact not a stain but an absence of lichens or moss.
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White stains on wood shingle roofs.
What are roof shingles.
Trees plant debris stains.
Algae lichens and moss for example.
Roof shingles are installed in such a fashion that each seam or joint is overlapped by a shingle further up the roof.
From your description you may have lichen growing on the surface of your roof.
Use a garden hose to rinse the stains and cleaning solution from the roof.