How to Prevent Algae Growth
In general, algae spores spread in two ways – by wind or by animal, which is
why it is not unusual to find neighborhoods where algae growth is visible on multiple roofs. Since stopping the spreading of algae is difficult to stop, here are some of the best preventative actions to alleviate conditions that promote algae growth:
- Allow more sunlight to hit your roof by trimming tree branches.
- Ensure your rooftop is clear of debris such as leaves, sticks, acorns, etc.
- Regularly clean your gutters out to allow for proper water drainage.
The use of algae resistant roofing shingles on your roof replacement or new home roof installation will help significantly decrease algae buildup. Algae resistant roofing shingles are manufactured with granules containing copper which hinders the growth of blue-green algae. CertainTeed offers a variety of shingle designs and colors that carry the StreakFighter© Algae Resistance label, which indicates that they are warranted against algae for up to 15 years. If algae staining becomes apparent on shingles covered by the algae-resistant warranty, CertainTeed and most manufacturers will give customers the option of either cleaning or replacing the contaminated shingles.
Going to Combat with Algae
Unfortunately, the discoloration caused by algae is difficult to completely remove from roofing shingles, though, it can be lightened. To ensure proper maintenance, cleaning and repair of your roofing system, we suggest you contact a credentialed roofing contractor as they have the expertise and experience needed to take proper action.
A recommended way to clean your roof would be using a 50:50 combination of laundry grade liquid chlorine bleach and water. This method is only temporary and can cause slight discoloration of your roof. However, other cleaning chemicals and methods should not be used as they are not covered in the product warranty, unless approved by CertainTeed.