I’ve got moss growing on a section of my roof. This part is facing north and mostly shaded. The moss is getting thick and I’m afraid it will cause some kind of damage. What do you have that I can spray for moss on the roof top?
Moss growing on roof shingles will happen when moisture accumulates that doesn’t get a lot of sun to dry it out. And when the roof shingles are on a relatively flat section, the odds of moss or algae growing are greatly increased.
To kill off the unwanted moss, get some MOSS KILLER. This comes in a handy ready to spray jug that simply needs to be connected to your garden hose and you can start spraying. The best way to use it is covered in our MOSS CONTROL article but here is the short summary.
Basically you should wet the area down with some fresh water before spraying. Next, lightly treat using one quart of Moss Killer per 500 sq/ft of roof area. After spraying, if possible you should scrub the product in with a brush or broom. Getting it to penetrate insures a faster kill and if you don’t get it to penetrate enough, you’ll need to treat more than once so scrubbing the moss directly can be important. This is especially true if the moss growth is thick which can happen after a year of growing.
In most cases you’ll see the moss dying in 1-2 weeks and within 1-2 months, it will start flaking and falling off the shingles.
Here are direct links to the information and products listed above:
Moss Article: http://www.bugspray.com/moss.html