When I speak to home owners about moss Roof Cleaning, I’m very open about the fact that the black streaks we normally treat are harmless and doesn’t effect the life of the shingles. The algae causing the black streaks on your roof is actually a cyanobacteria called Gloeocapsa Magma.

Moss or lichen on the other hand will cause damage to your roof if left untreated.  A moss roof cleaning is necessary because moss on a roof is caused by lots of moisture and lots of shade. The moss spores arrive on your roof carried by wind or animals and can easily spread throughout neighborhoods. Unlike algae, moss can be detrimental to asphalt shingle performance.

Moss can thrive on roofs because it’s a non-vascular plant that obtains water through its leaves and not through a root system. Here in North America, moss tends to grow on north facing roof planes that receive less direct sunlight and stay damp longer than south facing planes.

Addition moss roof cleaning factors include trees that overhang a roof constantly shade any sunlight and our humid coastal climate helps to holds in moisture and acts as a food source for moss. All these conditions create the perfect environment for moss. Cutting back trees is recommended if you have moss growing on your roof. This will let some sunlight in and prevent it from growing back once cleaned

Moss Roof Cleaning Recommendations

According to the Asphalt Roofing Manufacturers Association, Moss can cause the leading edges of the shingles to lift or curl, which increases the risk of shingle blow-off during wind events. In severe cases, moss build-up can cause lateral water movement resulting in moisture damage to the roof deck or may even cause leaks.

The most effective method of moss roof cleaning begins with a light brushing of the roof with a stiff bristle brush to remove the large growth. Next, a strong antimicrobial mix of six percent liquid chlorine bleach and water is applied to ensure the entire plant is treated. Moss roof cleaning requires more work then cleaning the algae causing black streaks normally encounter here in Hampton Roads Virginia.

Moss roof cleaning is more costly because it has to be manually brushed to remove the larger chunks before treating with the potent antimicrobial cleaning solution. This means we must access the roof increasing danger to employees and consequently, increasing the price. This is especially true for steeper roof pitches. Some applications may even require a man-lift.

Next we apply a strong antimicrobial cleaning solution with a softwash sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes, and then rinse thoroughly with low pressure water. We’re sure to take proper precautions to protect landscaping and surrounding areas from the cleaning solution runoff.

Do you have moss or those unsightly black streaks ruining the appearance of your home? The sooner you take care of it the cheaper the cost so don’t wait, if you see moss or lichen growing on your roof, call your Softwash Super Hero.

We’ll get a quote out to you instantly to bring back your home’s natural appearance while also protecting your largest investment.


Call Neptune Clean today: 757-384-0411