black roof stains Gloeocapsa magma India

Guarding Against the Bloom: Micro-Biocide Metallurgy and Algae Inhibition in Tropical Shingle Systems

• September 21, 2026
• admin

In humid tropical and coastal belts across South India, a familiar aesthetic defect appears on sloped roofs within 24 to 36 months of installation: dark, unsightly black streaks and brown staining cascading down the slopes. Homeowners often mistake this discoloration for accumulated industrial soot, dirt, or mold. In building biology, however, this staining is caused …