Roof algae and black streaking on shingles
Why it happens here
The dense tree canopy over Forest City Road and Bear Lake keeps shingles shaded and damp. That moisture feeds algae, which eats into the shingle mat and makes the roof look old even when it still has life left.
Our approach
We soft wash the roof with a mildicide that kills the algae at the root, then recommend algae-resistant shingles on replacements. For roofs with heavy shade, we also check attic ventilation to reduce moisture from below.