Power Washing and Roof Cleaning Forum

Jeff Wible · Approved Exterior Cleaner

Gutter Streaks Revisited?

Art O · Approved Exterior Cleaner

Hi Jeff, I asked Artifical Intelagents your question.
The phenomenon you're describing has a logical and scientific explanation. Gutter streaks and the absence of streaks in areas with valley splash guards can be understood through the principles of fluid dynamics and the way water flows within gutters.

Valley Splash Guards: Valley splash guards are designed to control the flow of water in the gutter system. They are typically placed where two rooflines meet, creating a valley where a larger volume of water is funneled into the gutter. These splash guards help to direct the water away from the point where the two rooflines meet and into the main flow of the gutter. When water is directed smoothly along the gutter's path, it is less likely to create streaks or stains. The splash guards act as a barrier that helps guide the water, reducing the chances of it splashing onto the gutter's surface and causing streaks.

Gutter Streaks: Gutter streaks usually occur when water flows chaotically or is not adequately controlled. They can result from a combination of factors, including debris, leaves, twigs, and dirt in the gutter. When water flows over these obstacles and splashes onto the gutter's surface, it can leave streaks or stains over time. Streaks can also develop when there is turbulence in the water flow due to irregularities or clogs in the gutter system.

So, the scientific explanation is that valley splash guards help maintain a smoother and more controlled flow of water, reducing the likelihood of water splashing onto the gutter's surface and causing streaks. In contrast, at the ends of the splash guards, where they terminate, water flow may become less controlled, which can result in streaks forming. It's a matter of maintaining a consistent and controlled flow versus areas where water flow may become turbulent and chaotic.

Jeff Wible · Approved Exterior Cleaner

Thanks Art,...my idea was loosely the same principle as described about the water flow from the roof. But even gutters that handle flow from the roof and no overflow also have gutter streaks. There has to be something else to the "splash guards" preventing gutter streaks. I also have a customer with a about a 3' straight piece of splash guard,..(Not sure why just in that one spot),....But under that there are no gutter streaks..... So wondering how high the splash guard has to be to be effective at preventing gutter streaks. Maybe if manufacturers would add a one or even two inch molded guard it would be the end of gutter streaks?

As I dig around I see they actually make straight splash guards. But too high and I think the concept wouldn't be aesthetically appealing..But an effective height of maybe one or two inches as I mentioned would work?

Jeff