One item under the Home Maintenance banner is Moss Removal from the roof. In some parts of the country it is a regular roof maintenance item.
There are several products on the market for cleaning the roof of moss. If you’re in a hurry, there are commercial products available -try and find one that is harmless to your roof, of course, but also to the vegetation (shrubs and and lawn) adjacent to the house and garden.
HOW TO CLEAN A ROOF
What I did first was to take a stiff push broom, or the like, and dislodge the larger growth, leaving only the smaller stuff on the surface of the shingles. If untreated, it will make a return appearance. Apply the solution in accordance with the manufacturer’s instructions and rinse it all down.
If you’re not in a hurry there is another, more benign method I used to kill moss on my garden shed roof. It had a pretty official looking growth of moss on the north-facing side. I brushed off the larger growth that was easily removed and went up there with a box of Tide Powdered Laundry Detergent. I spread the Tide all over the upper elevations of the roof and went away. Meanwhile, the rain dissolved the Tide and it ran down over the entire roof, killing the moss. I did it in the autumn and actually forgot about it. By spring the roof was moss-free and clean.
The video talks of the effect copper has on roof moss, algae and lichens. A copper strip (approx. 3″ wide) can be tucked under the shingle cap course -to run the length of the roof to thwart the growth of moss. It works in a similarly to throwing Tide on the roof. The results take time. Copper is an expensive way to go but, once installed, should solve the problem without having to revisit.
Regarding Roof Safety: Falls from roofs injure and kill thousands of people annually. Roofs are slippery and when wet, even more so. It cannot be overly stressed the importance of sturdy shoes and practicing situational awareness. Ladder Safety comes into play as well. Before you attempt going up on a roof, go over your job plan and think about what could go wrong. Take preventive measures. Always utilize Safe Work Practices. A fall from a roof of 11 feet will only give you a 50:50 chance of survival.
Further on-topic information: