A more common type of growth on roofs is of course moss.
Green mossy things on my roof.
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Moss growing on a roof lifts the shingles and allows water to seep underneath and rot the roof deck.
Moss on a roof begins with a thin dusting of green that you may notice only from low angles.
The cost depends on the size of your roof the amount of moss and the labor rates in your area.
This thin layer on the top of the shingles expands and becomes wide thick and mat like.
Roof moss and lichen are not only unsightly but can damage the roof over time.
If you notice green white or gray spots on your roof moss and lichen are likely the culprits.
As a rule of thumb professionally removing moss will cost about 5 of what it would take to replace your roof altogether.
Moss is darker green much thicker holds more water and also grips into the surface of the shingles.
The seams between the shingles and the shingles edges also develop moss because they tend to be especially shaded.
Here we discuss the causes of algae moss lichens or fungal growth on roof shingles the effects of these conditions and how to cure or prevent them.
The third most common type of growth on a roof is algae.
To remove moss you first have to kill it.
These are probably not good things for your composition shingles.
Asphalt roof shingle defects.