Verdant and thick moss flowing atop a roof looks really pretty. While it adds a sense of fairy tale to a home, moss adds no other value to a home. As a matter of fact, if you leave it unchecked, the moss could seriously damage your home costing you thousands of dollars in the end.

Verdant and thick moss flowing atop a roof looks really pretty. While it adds a sense of fairy tale to a home, moss adds no other value to a home. As a matter of fact, if you leave it unchecked, the moss could seriously damage your home costing you thousands of dollars in the end.

When the moss on your roof becomes too thick to the point of covering the shingles and creates some sort of decay, it will be too late to do anything—the roof just has to be replaced.

But did you know that there are easy and affordable ways you can kill the moss on your roof? That’s right! You can easily use wet or dry applications that are less costly and more convenient than removing already dead on your roof.

How Moss Destroys a Roof

North-facing roofs that receive limited sunlight are highly prone to the effects of moss. However, in such areas, moss does not sprout in equal measure at every spot.

Generally, moss grows in spots that are perennially shady and tend to be damp and cool at the same time. Hence, if you reside in a cool but damp climate, then areas on your roof that receive adequate sunlight each day may not have moss.

A roof moss starts out as a thin dusting that’s greenish in colour and only noticeable from a low angle. This thin layer atop your shingles spreads out, becoming thicker, wider and mat-like. Since the seams between the shingles and shingle’s edges are more shaded, they too form moss.

As the growing moss continues to thicken, it finds its way under the roof’s shingles, raising them up. If the shingles are wooden, the process is accelerated the more. The porous surface of the wood is a prime ground for moss growth.

After the moss has worked through the wood shingles, it becomes tougher to remove than when it is on a moderately smoother surface of asphalt or composite shingles.

When the moss becomes a thick mat, it turns into a sponge-like mass that absorbs and retains all moisture. The stored water or moisture works its way below and in between shingles before moving to lower levels of the roof felts and the structural features of your roof. Eventually, this causes rot which then leads to more decay of the rest of the roofing materials.

Dry vs. Wet Moss Killers

Dry powdered moss killers are easy to apply. You simply sprinkle the powder in several lines that are parallel to the house’s ridge, spacing lines at about 5 feet apart. As it rains, the rain water mixes the moss powder and runs down towards the eaves. After a few days, the existing moss should be able to clear.

Note that dry powdered moss killers can be tricky to apply evenly and can also leave some white marks on the roof that can only be washed away by several days of heavy showers. Also, dry powder that has just been applied can be blown off if strong winds come before the rains.

Liquid/Wet Moss killers

These come in a special container designed to easily attach to a garden hose and can be mixed on a metered source as the water flows through the pipe. The liquid moss killers can be applied from the ground when you have adequate water pressure that can reach the roof’s ridge. Since it can be a challenge tracking your progress, it becomes convenient to divide the roofing area before spraying one section after another.

Compared to the dry moss killers, liquid moss killers cover the roofing area more evenly, allowing you to apply it from the ground (although you may have to climb up the roof later to remove the remains of the dead moss). If the pipe can’t get water to the roof’s peak from the ground, then stand on a ladder and spray from it.

One really frustrating shortcoming of liquid or wet moss killers is hard to keep track of where you’ve already sprayed and where you need to spray. To fix this, try starting with a very dry roof. The wet moss killers are generally more expensive than powdered moss killers.

Common Moss Killer Products

Bayer 2-in-1 Algae and Moss Killer
Moss B Ware
Lilly Miller Moss Out!

Tools or Supplies Required

Long extension ladder
Garden hose
Putty knife and painter’s 5-in-1 tool

The information contained in this article is of a general nature only. It does not take your specific needs, objectives or circumstances into consideration, and is not financial advice, legal advice or otherwise a recommendation to purchase any financial product or insurance policy. You should seek your own independent financial advice from a qualified financial and insurance adviser before making any financial decisions, and seek your own independent legal advice from a qualified solicitor before making any decisions of a legal nature.

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