Syverson Pressure Washing

06/02/2026

How many of you have seen these dark streaks on a roof and assumed it was time for a replacement?

Most people do. But that streaking is not age and it is not damage. It is a living organism called Gloeocapsa Magma, a type of algae that forms when airborne spores land on your shingles and begin to feed on the limestone filler inside them. As it spreads it creates that dark, almost black streaking pattern you see across the surface. It holds moisture against the shingle, accelerates deterioration over time, and makes a roof look far older than it actually is.

Here is why that matters beyond just curb appeal.

For homeowners selling a home, that algae gives buyers immediate leverage. It raises questions about the condition of the roof, it creates doubt, and it hands buyers a reason to negotiate the price down or walk away. First impressions drive decisions and the roof is one of the first things a buyer sees.

For homeowners with insurance, it can be an even bigger problem. A lot of people do not know that insurance underwriters look at something called pride of ownership when assessing a property. If your roof looks neglected, it signals to an underwriter that the home may not be well maintained overall. That can result in reduced coverage, higher premiums, or in some cases a denial of coverage entirely.

The good news is that in most cases this does not require a replacement. It requires the right treatment.

If your roof looks like this, reach out before you make any decisions. We will take an honest look and tell you exactly what your options are.

Syverson Pressure Washing
(507) 990-9251

06/02/2026

Luke Miller is a realtor who reached out to me about a property in Saint Charles, Minnesota. The family he was representing had a 50 year old slate roof that looked like it was done. Instead of replacing it, Luke wanted to see if we could restore it first.

Slate is a completely different animal compared to asphalt or cedar. This was not a simple soft wash and rinse. We applied a high concentration of sodium hypochlorite, scrubbed the entire surface intensely to make sure we broke through all the buildup, let it dwell, and then rinsed it aggressively. It took real effort to get this roof to where it needed to be.

First photo is before. Second is during. Third is after, still drying in the sun.

A full slate roof replacement on a home like this runs around $50,000. We restored it instead and saved the family roughly 90% of that cost. It looks brand new.

Restore before you replace. Reach out before you make any decisions.

05/30/2026

We are excited to announce that Five West Kitchen + Bar and Smoak BBQ have both come on as monthly exterior window cleaning clients with Syverson Pressure Washing.

If you are in Rochester, stop in and grab a meal at either spot before June 6th. Then come back after. Take a look at the windows and see the difference for yourself.

We do not just talk about quality. We show it.

Raising the Standard in Rochester, one property at a time.

Syverson Pressure Washing

05/14/2026