How to Remove Moss from Shingles to Preserve the Roof
Along the roof where there is more shade from nearby trees, you may have noticed that the normally dark shingles have a green appearance. That green substance is moss. While moss may look pretty and give a more natural, woodland appearance to your home, it can actually damage the roofing system.
Moss grows in shady areas of the roof. So it is prone to appear on the northward facing part where sunlight is the weakest. Once moss begins to build up, it will start to grow under the shingles and push them upward. Thick moss will also hold in more moisture. With the roof covered in moss and shingles buckled up, the moisture can invade your home to cause rot and decay.
Remove Moss from Shingles
There are several ways to remove moss from the shingles. The method you select will depend on the state of the existing roof system, the amount of work you want to place into the task, and your budget. One of the simplest, and messiest, ways to remove moss is to scrub it off .Also, take into account the height and architectural complexity of the roof, as you will need to use a ladder to get up high to treat the problem.
Replace the Roof
Based on the state of the roof, you may simply replace the entire roofing system. This strategy is ideal if your roof has overall damage or when the shingles have reached the end of their lifespans. If the roof is still in good shape, then you can clean the moss off using these other methods.
Prepare Foundation Plants and Roof for Cleaning
Before selecting a cleaning method, you want to wet all plants, flowers and bushes along the foundation. This makes it easier for the moss to slide off once you toss it over the roof. You can also cover over the plantings using plastic sheeting. After the cleaning, make sure to wash off the moss that may have collected on the plantings.
Scrub Off the Moss
One of the simplest, and messiest, ways to remove moss is to scrub it off. You want to wet down the moss with a garden hose. Using a soft-bristle brush, work at the top of the roof and make your way down. Gently rub the moss off the shingles without ripping and scouring the area.
If the moss is stubborn and parts of it can’t be removed with a scrub brush, you can make a homemade cleaner. Mix 2 gallons of water with one of these household cleaners: 8 ounces of mild dishwashing liquid, white distilled vinegar (1 and a half to 3 and a half cups), or 1 cup of oxygen bleach. On a cloudy day, wet down the roof and apply the cleaner. Let it sit for 40 minutes before scrubbing the roof and rinsing it off.
There are also dry and wet commercial cleaners available. Some of these cleaners can be applied without rinsing them off. Instead, the rain will mix with the cleaner and remove it as well as the moss from the shingles.
Some common types of commercial cleaners include Bayer 2-in-1 Algae and Moss Killer, Wet & Forget, and Moss B Ware. Before using any cleaner, make sure to read and follow the manufacturer’s instructions for proper application. You will want to protect your plantings and other outdoor structures before applying the commercial cleaners.
Avoid Using Power Washers
It is true that you could use a power washer to blast the moss off the roof. However, high water pressure could further damage shingles that are already chipped or worn out. The water blast can also strip off the shingle’s granules that help protect your roof from adverse weather. If you decide to use a power washer, use the lowest pressure setting and stand at the top of the roof to wash the moss downward.
Prevent Moss from Returning
Once the moss is removed, consider adding copper or zinc strips to the top ridge of the roof. These metals naturally kill off algae and moss. You should also prune tree limbs so that more sunlight can reach the shingles.
Is it bad to have moss growing on your roof?
Moss are greenish miniature plants with woodland appearance that grow in shady areas of the roof and can actually damage the roof. It’s bad to have moss growing on your roof as it can severely damage the structural integrity of the roof. Moss are also an indication of moisture which when gets beneath the tiles leads to wood root and leaks. Moss also harbor bugs and rodents which are a nuisance.
Should you remove moss from roof?
Yes! You should try and remove moss from your roof to prevent them from damaging your roof. There are several ways to remove moss from the shingles. The ideal method is usually dependent on the state of the existing roof system, your budget and the amount of labor required done to remove the moss. You should be keen to spot and remove moss early enough before the roof gets severely damaged.
Does vinegar kill moss on roofs?
Yes? Vinegar is quite effective in killing moss and lichens. This is because vinegar contains chemicals such as chlorine which are acidic and kills living plants. Just mix 1½ to 3½ cups of white distilled vinegar with 2 gallons of water and pour it on moss. Leave it to soak for up to 24 to 48 hours. The use a brush to remove the dead moss or lichens
Does baking soda kill moss on roofs?
Baking soda can kill moss on roofs. Moss dies when it is exposed to alkaline, which is why this solution works so well. But you do need to be careful when using it, especially if you have new cedar shingles. If the solution gets onto the bare shingles, it will cause them to fade very quickly.
What can I put on my roof to stop moss growing?
Laying copper or zinc strips along the roof ridge is a good way to stop moss growing. A 2-inch strip is wide enough to keep the average-sized roof moss free. Cutting back trees and plants that overhang your roof will also help. It will make the roof too hot for moss to grow freely.
Will bleach damage asphalt shingles?
Provided you do not use bleach too often it will not damage asphalt shingles. It is important to dilute it properly. Mixing 1.5 cups with 3 cups of water is sufficient to remove most roof staining. Also, you should only use oxygen bleach. The chlorine type is too strong.