You will need to treat the roof to stop the moss from growing back.
How to remove moss from my garage roof.
An alternative to manually removing the moss with a brush and trowel is to use chemicals.
If you want to clean moss off a roof yourself you will have to plan how you are going to kill the moss and remove it effectively.
I ve got a product to paint on my garage concrete asbestos corrugated roof but first i need to get the moss off it.
I have an asbestos corrugated garage roof approximately 2 4m by 6 5m.
There are a range of chemicals to use on your roof to kill any moss and the benefit with using a chemical is that it will remove all of the smaller moss spores that you can t necessarily see and any moss that is beneath the tiles.
Liquid moss killers cover the roof more evenly than dry powders and they let you stay on the ground for the application.
The roof has started to leak in a few places mainly where the roof butts up against the main wall of the house.
Of course i don t want to scrape it off i need a product that can be sprayed or poured on to it and the moss dies and can then be washed off clean.
Even so you will always need to mount the roof later on in order to remove the dead moss.
If the water will not reach the peak of the roof from the ground you can spray while standing on a ladder.
Carefully place a ladder near the area of moss growth and don slip resistant shoes old clothes rubber gloves and eye protection.