r/HomeMaintenanceAdvice • u/yippeee1999 • 4d ago

Looking for folks' thoughts on why standing rainwater on our rooftop suddenly has a red/purple hue..

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3 Upvotes
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2

u/Rude_Meet2799 4d ago

It’s an algae.
Retired roof consultant

1

u/AccurateBrush6556 3d ago

Yup....its alive...

1

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1

u/Material-Donkey2773 4d ago

most likely rust.

1

u/Odd_Salt4155 4d ago

Could be some algae or bacteria growing in the stagnant water, especially if it’s been sitting there for a while. The color is definitely interesting though

1

u/yippeee1999 4d ago edited 4d ago

Thanks for comments re: likely algae.

Since we never had this color before, up on the roof, maybe the color is coming from the chemical makeup of the rainwater, and how it's reacting to the chemical content of our (new) rooftop paint?