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FAQ's

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We’ve gathered some of our most frequently asked questions. Find the answers to your questions here! If still have questions that we have not addressed on here, please feel free to contact us.

What are the black stains on my roof?

You most likely are noticing it the most on the north side of the roof and in shaded areas. Those “stains” are actually a type of algae (Gloeocapsa magma) that feeds on the limestone in your shingles.This algae thrives on dark, damp areas. It travels from house to house by spores that are carried by the wind.

In addition to looking ugly, the root system of the various types of algae dislodges the granules that protect and give color to your shingles. Over time, the mildew and algae slowly work to deteriorate the integrity of your shingles and gives your home an old, dirty ugly appearance. Ultimately, it reduces the lifespan of your roof.
Once it has been professionally cleaned, it should look good for 5-6 years. But it depends on environmental conditions and the number of trees in close proximity to the house. The algae will come back quicker in a wooded area as it thrives in damp, dark areas.
We use a naturally occurring bleaching and sanitation agent that is derived from simple sodium to safely and effectively free your home from bacterial and fungal infections. Our technicians will rinse your plants and spray our protective Plant Wash over any plants or bushes that are near the area we are cleaning. We suggest that our clients also spray those areas with a garden hose the evening after we are there and for a couple of days afterward to help keep them saturated.

We use both soft washing and pressure washing, depending on the surface and the job requirements. Soft washing is our go-to method for most siding, roofs, and delicate surfaces. It uses low pressure combined with specialized cleaning solutions to kill algae, mold, and mildew at the root — treating it like a pest, not just a stain. This process keeps surfaces cleaner 4–6 times longer than standard pressure washing.

We reserve pressure washing for durable areas like concrete where it’s safe and effective. On concrete surfaces, we often combine pressure washing and soft washing for the best results. First, we use pressure washing to remove heavy debris, dirt, and surface stains. Then, we follow up with a soft wash treatment that kills algae, mold, and mildew at the root — keeping your concrete cleaner for much longer.

A gentle spray of cleaning agents is applied to the affected areas and our specially formulated wash kills the algae present all the way down to the roots.
In most cases you will notice an immediate difference- especially if you have black algae stains on your roof. If you have moss or lichen, it is a growing organism that we will kill but we cannot force it off your roof. The roots go into the shingles and forcing it off would cause damage. The dead moss or lichen will eventually fall off after several hard rains over a couple of months.
Our roof cleanings include a 5-year limited warranty and apply only to full roof cleanings. For the first 12 months, if I Do Windows determines dark mold or mildew has returned, we provide a free touch-up. For years 2 to 5, we cover 50% of the treatment at the current retail price, and the property owner is responsible for the remaining 50%.

We carry liability insurance and workman’s compensation insurance. Our employees are verified through a third party security company called Ask the Seal.

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