Cleaning Black Roof Algae Tampa Florida Guide

Many more roofs seem to be developing unsightly dark black streaks. You may have seen this on a friend’s or relative’s roof, but if those lines are on your neighbor’s roof, yours may be next. It’s likely that it’s already discoloured. Those stripes are definitely unsightly, but it gets even worse.Do you want to learn more read the article

The streaks in the shingles are algae (gloeocapsa magma) consuming the limestone filler. When asphalt shingles were mostly replaced with the thicker, more wind-resistant fibreglass shingles we have today, this filler was applied to shingles about 30 years ago. Algae are drawn to limestone.

The discoloration appears to be concentrated on roofs facing north. It’s similar to moss growing on a tree’s north side. Since north-facing roofs receive the least amount of sunlight, they retain moisture from rain and morning dew for longer periods of time. This, combined with the smorgasbord of limestone, provides the ideal environment for any algae spores that might land on the roof.

When algae spores fall on a roof, they aren’t actually black. If only a north-facing roof has black streaks, the other roof faces are most likely infested as well. Just yet, the algae spores haven’t turned black. To shield themselves from ultraviolet rays, they build the dark sheath. Unfortunately, since dark colours absorb more heat than light colours, this dark pigment will influence energy bills.

The distribution of the algae (and the black streaks that accompany it) from roof to roof is akin to dandelions spreading from yard to yard. If your neighbour has them, you will most likely have them as well. Another resemblance is the most successful way to get rid of them. When you mow your lawn, you can get rid of a lot of dandelions… for a short time, so killing them is the only way to drive them away. The same can be said for algae on a roof.