Maintenance Guides / Exterior & Structure

Treat roof moss and algae

Difficulty: moderateTime: 60 minsEst. Cost: $50 - $300

Why it matters

Moss lifts shingles and traps water underneath. Visible black streaks signal Gloeocapsa magma algae. Critical in PNW and SE climates.

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How to do it

  • 1

    Inspect roof for visible moss or black algae streaks.

  • 2

    Apply moss/algae treatment using a low-pressure sprayer.

  • 3

    Allow treatment to kill growth over 3-7 days.

  • 4

    Rinse gently with garden hose (never pressure wash).

  • 5

    Reapply annually or as growth returns.