The problem

What’s attacking your roof?

With shingles today we are seeing an increasingly large number of roofs that are a breeding ground for organic growth. Why you might ask? With the EPA and the shingles manufactures in the mid 90’s set out to make shingles more environmentally friendly and in the process changing the composition of the shingle from a complete petroleum based product to a more organic product, one of the main ingredients that changes it all was the introduction of limestone.

When the shingles were a complete petroleum passed product there were no food sources for organic growth. Roofs still saw just as much sun and moisture in the past. Now, with the introduction of limestone that has changed everything! Now we have water, sun, and a food source for organic growth a process we like to call photosynthesis. If left untreated over time this can cause damage to your shingles, which can lead to premature failure.

Lichen on roof

Black Algae





The Solution

To have your roof professionally cleaned and maintained. Here at NortEeast PowerWashing we have the skills and the experience to not only give your roof a new look but to also extend the life of it! These days there are many forms of living organisms that can grow on roof tops and it is important to have them removed properly and safely. We hope that we can form a relationship of trust with you and be your number one choice for all you exterior cleaning needs.

Two different methods, 2 different solutions

The two methods of removal that NorthEast PowerWashing offers are a “Soft Wash” and a “Low pressure” type roof cleaning.

The “Soft Wash” method is basically what we like to call a ‘spray-and-leave’ type application with no rinsing involved. Depending on how much organic growth there is on the roof we will generally treat the affected areas of the roof twice in the same visit and on really bad roofs a third application may be necessary. With this application you can expect any black algae stains to be 80 to 90 percent gone the same day and any moss or lichen will be removed in the following rainfalls.

The “Low Pressure” roof cleaning consists of applying the solution to the roof in the same manner as the soft wash but is followed by a low-pressure rinse, removing all moss, lichen, and algae. With this process your roof will be resorted to it original look minus any damage that may have been cause by the organic growth on the shingles but is more costly due to the time involved in the rinsing process and the equipment used.

Not to make things complicated but in the cleaning process we offer two different solutions that can be used on your roof and we let you decide which to use. One being a sodium hypochlorite based and the other a sodium precarbonate.

Watch us in action

Get an inside glance of our soft/low pressure roof washing system in action. From putting down an environmentally friendly solution, to the low pressure wash, this video will show you NorthEast PowerWashing in action.




Here at NortEeast PowerWashing we have the skills and the experience to not only give your roof a new look but to also extend the life of it!

These days there are many forms of living organisms that can grow on roof tops and it is important to have them removed properly and safely.

Fully Equipped For Any Roof!

Roof Cleaning Equipt

Roof Cleaning Equipt

Roof Cleaning Equipt

Roof Cleaning Equipt

Here at Northeast Power Washing we have a small, 50-foot lift the better serve our roof cleaning customers. If a low pressure roof cleaning is desired and the terrain around the property permits, we will be using the lift. This is just one more thing that set northeast power washing apart from our competition.

Regardless of whatever size and type your roof may be we have the right equipment for the job. Be extra careful to make certain that no matter what company you choose to clean your roof they have the proper equipment to do the job without harming the roof by walking on it or using high pressure systems. Rest assured when you select NorthEast PowerWashing for the job that roof will be clean and unharmed!

What might be on your roof?

Black Algae Roof Stain

Black Algae Roof Stains

The black streaks that you see on your roof are a form of black algae, a living organism that is growing on your roof. I have a lot of old timers ask me why they did not have this problem on their last roof. I tell them that in the mid 90’s shingle manufactures changed the general composition of the shingles from a complete asphalt based product to an asphalt-fiberglass mesh. And to make the two bond correctly they introduced limestone into the mix as a bonding agent. They did this for environmental reasons and also to save on production cost, but they had no idea that they were introducing a food source for organic growth.

Lichen Growing on Roof

Lichen on roof

Lichen Growing on Roof

Lichen is one of the worst things to grow on your roof! Because of it’s root structure, the lichen roots grow around the granulars that protect your shingles, and over time will establish themselves in the fiberglass part of the shingle, dislodge the granulars from the roof and expose the underlying mat of the shingle, leaving it unprotected from the UV rays of the sun.

MOSS on the Roof

MOSS on the Roof

Moss is not as damaging as lichen but still harmful to the shingles. Most types of moss have a very shallow root structure and without much effort come right off. The problem with moss is that it loves moisture. Any time it rains or dew falls, the moss will hold that moisture close to the shingles for extended periods of time. The problem with this is that shingles where designed to be water resistant, not water proof. On shaded areas where the roof does not see the sun for long, the moss can hold the moisture close to the shingles for days, where the rest of the roof will be nice and dry. The moss will cause more of shingle deterioration and granular loss.



Slate roofs need to be treated with great care. We never get up on slate roofs! We use just the right combination of chemicals to safely remove the algae from the roof. In some cases, a lift may need to be used to access all areas of the roof.

For More Roof Cleaning Information

Visit our frequently asked questions page.