Having a thick green blanket of moss on the roof might make you think you have gone to a land of hobbit houses in New Zealand however this green substance has a sinister side. If left un-checked it can cause severe damage to roofing materials including water intrusion and wood rot!
Fortunately, there is a fairly simple process to rid this evil moss and keep it at bay.
Follow these steps to easily remove moss and keep it from coming back!
Using a soft bristle brush, scrub away the larger pieces of the dry moss. Removing these larger pieces before wetting or applying a cleaning solution will eliminate some of the mess. This is a pretty messy job once the moss is wet and being scrubbed so get those old clothes ready!
Once most of the larger moss has been scrubbed away, use a leaf blower to remove the pieces from the roof.
2)Cleaning / scrubbing
Most home centers sell specific cleaners that can be used to remove moss but a simple at home solution works just as well. Mix up a batch of 50% household bleach with 50% water. Place in a spray bottle or garden sprayer. Apply the mixture to the affected areas and let it soak for a few minutes. This process is best done on a cloudy / partially cloudy day so the solution can remain wet on the moss.
After a few minutes use the same soft bristled brush to scrub away the moss. Working from the top down. Once all the moss has been scrubbed down, wash down the shingles with a garden hose from the top down. Do not use a pressure washer on the roof, this can damage the granules on the shingles shortening the roof life.
3)Keeping moss at bay
Once the moss has been cleaned away, keep it away!
Zinc and copper are naturally toxic to moss and algae. Copper is the most toxic and works the best however is much more expensive than zinc. You can find rolls of 99% zinc at a home center for around $35 for a 50-foot roll.
The zinc should be applied at the top of the roof peak right under the roof cap shingles. Cut a strip the entire length of the area that has the moss growth happening. The zinc roll should come with nails with rubber washers included. Nail the zinc strip at 2-foot intervals along the top of the zinc strip. As rainfall happens, the zinc will wash down the shingles and prevent moss from growing back.
Moss does not grow well in direct sunlight. It is also a good idea to cut back any trees or shrubs that might be shading the roofing area from the sunlight to help inhibit new growth.
Contact us if you would like help with removing moss from your roof!