I've had a few really dirty roofs the last few weeks so I thought I would do a "show and tell" with the class. Anybody else have some really bad ones they want to share? Lets see some pics...
We did a roof last week that was plagued with moss. The one photo looks like a gutter but it is actually a very narrow strip of roof over the front door. We treated the roof and killed all the algae, moss and lichen. We explained to the HO that the moss is now dead and will rot away.