The Truth about Algae on your Roof
Are you wondering what those streaks are on your roof? Have you noticed that your house looks a little dingy even though the roof is only 8 years old? Have you seen a consistent pattern in your neighborhood of the roofs all being streaked with a darker color?
Can algae grow on your roof?
You may be familiar with the issue of algae on your home or maybe you think that here in the midwest we do not have the same issues as those who live in more tropical climates. Unfortunately, it can still spread and take root on your home before you even know it’s there.
How does it get there?
Algae forms in wet and humid climates and specific to your house, on the roof, where moisture tends to dwell after dew and rain. Algae spores are carried by the wind and animals and spreads quickly throughout neighborhoods from one roof to another. It has been common to see algae on rooftops throughout an entire neighborhood that is affected.
Algae discoloration usually begins with small spots but then quickly turns to streaks on the roof. By the time you are able to see the algae, it’s probably been there for several weeks to months or more.
How can I prevent the spread of algae on my house?
There are some steps you can take to stop algae from taking up residence on your home.
Trim tree branches
Allow as much sunlight as possible to hit your roof so it will dry quickly after dew and storms
Minimize debris accumulation
Clear off debris on your roof regularly with a non-abrasive method such as a leaf blower
Direct air flow
Airflow needs to be directed down the slope to avoid debris from becoming trapped under the edge of your shingles
Keep your gutters clean to the water can drain properly away from the roof
Don’t allow gutters from an upper roof to drain onto a lower roof. Doing so will extend the time the lower roof is wet and conducive to algae growth, instead extend the downspout into a lower gutter instead
When the time comes to replace your roof apply asphalt shingles with copper granules or asphalt shingles with algae resistant technology
Adding zinc or copper strips to your existing roof is not recommended as it can break the sealant bond over time, which may result in wind damage.
Cleaning your roof is much less expensive than replacing your roof before its time. IDW’s Soft Wash system typically costs less than $800 depending on the roof size as opposed to a full roof replacement costing thousands of dollars. A clean, healthy roof is an easy, environmentally safe and inexpensive way to get rid of algae, protect your home and restore your curb appeal.