Unfortunately you will have to get on the roof in order to treat the moss.
How do you remove moss from a roof.
If the water will not reach the peak of the roof from the ground you can spray while standing on a ladder.
You may also want to use a safety rope.
It is only advisable to use a pressure washer because you no longer need to worry about the condition of the old roof.
Check out our article on how to remove black algae stains on roofs to find out more.
Even so you will always need to mount the roof later on in order to remove the dead moss.
After cleaning you ll also need to put some defensive measures into play to prevent roof moss from growing back.
Once you get on the roof tie one end of the rope around a secure structure on the roof such as a chimney.
Whenever possible work with a second person who can hold the ladder and monitor you while you re on the roof.
Your roofers will need to remove all the shingles on your old roof or they may need to remove the largest chunks of moss with a pressure washer and then apply the new roof.
If you want to see quicker results consider sprayer an algae and moss killer like wet forget on the roof when you install the copper strips.
Liquid moss killers cover the roof more evenly than dry powders and they let you stay on the ground for the application.
Before you clean moss off a roof you ll need to consider how you want to kill the plants and remove the dead layers of moss.