Reasons Why You Have Moss On Your Roof
That green stuff growing on your roof may look rustic and woodsy, but it can be a sign of future repair expenses. Moss doesn't directly damage roofs unless it gets under and lifts up shingles, but it is indicative of damaging moisture conditions. Find out below why you have moss growing on your roof and what you can do about it.
Reason #1: You have too much shade
While shade trees are a lovely addition to the yard, they can be tough on your roof. Moss needs shady, moist conditions to thrive. If your trees overhang the roof they are both providing the necessary shade and likely trapping moisture near the shingles. Your best option is to trim back the trees to allow a little sun to shine directly on the house.
Reason #2: The roof is dirty
A dirty roof is more likely to foster moss growth. Moss tends to grow on organic matter resting on the roof, not on the shingles themselves. Fallen branches, leaves, and pine needles are the biggest culprits, although even a thick layer of dust and dirt can provide a home for moss. Get out your hose and most powerful garden sprayer attachments and hose down the roof periodically to keep it clear of debris.
Reason #3: Your house is north-facing
A north-facing house, especially one with a steep pitch that leaves one side in shadow for most of the day, is more likely to develop moss. This is especially true in wet or humid climates. You can't do much about the orientation of your home, but you can choose roofing materials that are more moss-resistant, like treated asphalt shingles or metal roofing. Consider upgrading to one of these materials the next time you need a new roof.
Reason #4: There is no zinc strip installed
Another reason you may get moss is because of one missing preventative measure – the zinc roofing strip. Moss can't grow in a zinc-heavy environment, so roofers install a strip of this near the ridge of the roof. Each time it rains, the zinc leaches down the shingles and creates an invisible moss barrier. Call a roofer and get one installed if you suspect that you don't have one and don't plan to replace the roof for a while.
Any moss treatment does need to begin with removal of the existing moss first. For this, call in a roofer to complete the job. They are trained to walk on your roof and clean it using methods that won't damage your shingles.
For a roofing contractor, contact a company such as Crown Remodeling LLC.