White stains on asphalt shingles

vintage1937 Posts: 1, Reputation: 1

New Member

Feb 19, 2011, 04:52 PM

White stains on asphalt shingles

What causes white stains on asphalt shingles at the bottom of ledder fed by Cental AC handler?
Jim

hkstroud Posts: 11,929, Reputation: 899

Home Improvement & Construction Expert

Feb 19, 2011, 08:40 PM

What's a ledder?

Add your answer here.

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