If your home is in an area that has hot, humid summers, you may have a problem with roof moss. Moss not only damages a roof, it detracts from the exterior appearance. You can use household bleach to kill the growth, but the chemical runoff will also kill any vegetation it touches. Chlorine bleach can also lighten roofing material and corrode gutters and downspouts. A better way to kill the moss is to use an eco-friendly method.
Set up a ladder up so you can climb on the roof to kill the moss. Make sure the ladder is on level ground and doesn't wobble or lean. Grab the brush and rake and climb the ladder up to the roof.
Scrape any thick accumulations of moss off the roof with the back end of the garden rake. Do this to speed the elimination process.
Push the moss off the roof by using the long-handled brush. To protect a shingled roof, start at the top and work your way down to the bottom. The brush will kill the moss by ripping up its shallow roots from the roofing material.
Rake the moss up off the ground and put it in a wheelbarrow. Dump it in an area away from the house.
Kill the moss on a clear day when the roof is dry and not slippery from dew, rain, snow and other elements.