All roofs face more punishment than your walls and doors. Facing the sky directly, roofs embrace the impact of hailstones during hailstorms, rainfall, snow, and the heat of sunlight and UV radiation. Aside from these bringers of devastation, natural undergrowth can kill off your Calgary AB roof in no time. If you want to know how to remove moss from your roof, it pays to know the proper procedure.

This Old House has an excellent guide on removing mold and moss growth on your roof. With their procedure, you can kiss this particular headache goodbye. Read more about it below:

Getting Algae and Moss Off the Roof


What causes the mold on my roof? How can I get rid of it? How can I keep it from coming back?

— Trudy, Muskegon, Michigan


This Old House replies: The black mold-like stains and streaks that appear on roofs, particularly light-colored asphalt shingles, is actually a blue-green algae (Gloeocapsa magma). Commonly found in climates with warm, humid summers, it does no damage to the roofing, but it certainly does looks bad.

You could replace all the roofing with new shingles dark enough to disguise the staining, or with shingles laced with copper granules, which are lethal to algae. But that would only make sense if the shingles were worn out.

The less expensive solution is to spray wash the roof with a 50 percent mix of water and bleach to get rid of the algae. (No pressure washers, please. They’re likely to damage the shingles.) Just be sure to wet your foundation plantings first, and rinse everything in clean water when you’re done. Plants don’t like bleach, and wetting them with plain water first protects them.

To keep the algae from coming back, insert 6-inch-wide strips of zinc or copper under the row of shingling closest to the roof peak, leaving an inch or two of the lower edge exposed to the weather. That way whenever it rains, some of the metal molecules will wash down the roof and kill any algae trying to regain a foothold on your shingles.

You can probably see this same principle working on roofs in your neighborhood. Look for chimneys with copper flashing; the areas directly below the flashing will be free of any algae stains. (Read the entire post here)

Years of expertise has taught even the best Calgary AB roof maintenance and services contractors that a huge ounce of prevention can defeat tons of cure. Roofing maintenance truly plays an important role in extending roofing lifespan and performance.

One of the things contractors have to understand is to know the primary causes of moss growth on residential roofing. This post from The Record will give you an excellent idea so you can nip mold growth right in the bud.

What Causes Moss To Grow On Your Roof

The growth of moss on your roof is more than an unsightly blemish that detracts from the appeal of your home. Moss is a nuisance that threatens the integrity of your home and the health of you and your family.

The shingles on your roof offer an ideal environment for moss and algae to grow because it is an area of your home that is moist and humid, which when combined with the indirect sunlight of shade from trees, allows moss to thrive. The accumulation of leaves from the trees and other organic debris that collect on your roof give moss the necessary nutrients to grow.

Moss holds water on the surface of your roof like a sponge and, over time, the shingles crack and pull apart as the water freezes and thaws, allowing water to leak in and rot your roof. In addition, because moss flourishes near the edge of shingles, it can pry the shingles apart as it expands.

When it comes to moss and your roof, an ounce of prevention goes a long way to saving your roof. Proper care and maintenance can eliminate conditions that promote the growth of moss of your roof and regular roof inspections can detect the early signs of moss growth so you can take steps to discourage the spread of the moss.

Trimming tree branches that are near or touching your roof will deter the growth of moss or algae. Keep your gutters clean and remove any leaves and debris so water can drain properly, eliminating conditions that will allow moss to grow.

You should also ensure your roof is well-ventilated roof to promote air circulation in your attic, preventing condensation from forming in your attic and lead to the growth of moss on your roof.

In some cases, mold growth can become extreme and overtake the roof’s foundational materials. When this happens, it is unfortunately time to replace your old roof. In fact, when you see these signs, it is definitely high time that you considered replacing your roof to improve your property’s condition and protection against the elements.

Good Housekeeping has an excellent article on knowing when your roof is “shot” and needs to get replaced. Read it here.

8 Warning Signs That Your Roof Is Shot

Know when it’s time to run for cover — and by that, we mean call in the pros.

A solid roof above your head is pretty crucial if you’ve become accustomed to having a warm, cozy, and leak-free home. Here’s how to notice and deal with potential issues before they become big ones.

1.Your roof’s 25th birthday is approaching.

“An asphalt shingle roof should last between 20 and 30 years,” says Claude McGavic, executive director of The National Association of Home Inspectors. “If you have a 40-year-old roof,there could be a problem — even if it looks good from the ground.”

How much time you’ve got left: Five to 10 years, depending on your roof’s condition. If you live in a development and your neighbors are all starting to replace their roofing, that could be a sign that you should do the same.

2. The shingles are curling.

Shingles can curl in two ways: There’s cupping, which happens when the edges of the shingles turn upward; and there’s clawing, which is when the edges stay flat and the middle starts to come up. “Both are signs of weathering and indicate that problems — potentially leaks — are relatively close to fruition,” says Mark Graham, vice president of the National Roofing Contractors Association.

How much time you’ve got left: “Depending on the extent of the curling, it could be anywhere from a year to five years before you need a new roof,” says Graham.

3. Entire shingles are missing. (Read full post)

Now that you know proper roof maintenance and how moss affects your roof in the most extreme cases, you can now provide excellent maintenance to your roof. However, if you need a professional to do the job without fail, you can count on No Payne Roofing to help with your Calgary AB roof maintenance or replacement — just contact us today!