Roof cleaning does involve a few steps and the first step should always include identifying the required treatment.
What You Need To Know About Cleaning Asphalt Shingles
Per the manufacturer, asphalt shingles should not be walked on, or have any cleaning agent or water applied to the shingles using pressure that exceeds a typical garden hose. This is around 70 psi. So when it comes to cleaning your asphalt-shingle roof, it is important to use low pressure and the correct chemicals to maintain the longevity and integrity of the shingles. Cleaning your roof at very low-pressure will provide you with a way to kill and treat algae in an effective way, but not cause harm or damage to the integrity of your roof.
This is a process that is better known as soft-washing. This means that the chemicals clean the surface rather than high pressure. It is the best and safest method to clean asphalt shingles and your roof.
Step-By-Step Guide On How To Clean An Asphalt Shingle Roof
1. Protect Your Vegetation
Before you start doing Roof cleaning and Repair, it is important to ensure the surrounding vegetation has been pre-soaked using water. This ensures that cells in the plants are completely saturated which means the plants won’t absorb any chemicals through their leaf layers. It is also important to rinse the plants again once you are finished cleaning your roof for added plant insurance and protection.
2. Mix The Roof Chemicals Into A Garden Sprayer
Since the common algaecide used in the pressure-washing industry is Pool Shock (12.5% Sodium Hypochlorite), here is a guide on the chemical ratios you should be using when you plan to clean roof shingles. The guide below ranges from the least to the most concentrated mixtures.
– 25% Sodium Hypochlorite, 75% water
This mixture is used for light Gloeocapsa Magma stains. This is not the right mixture for hearty algae or fire moss.
– 50% Sodium Hypochlorite, 50% water
You can use this mixture on Gloeocapsa Magma or black streaks, or for light-black algae.
– 75% Sodium Hypochlorite
This is the mixture to use for lichen, fire moss, and hearty algae.
It is recommended to use the 50/50 mixture for most shingle roofs as this will ensure the chemicals are “hot” enough to achieve desirable results.
3. Start From The Top
It is best to start from the highest point of the roof and work your way down. Make sure you apply even coats of the chemical.
4. Double Treat Problematic Areas
If the algae have not turned white or disappeared within 5 minutes after you have applied your first coat, reapply another coat over the problem areas. If the second application is still not working, you can use a stronger solution of the chemicals combining a mixture of 75% Sodium Hypochlorite with 25% water.
5. Re-Soak Your Plants
Spray your plants with water again in case they were exposed to the Pool Shock mixture that was applied to your roof. This is one of the steps that many inexperienced companies skip, and it could end up costing you your vegetation and surrounding landscape. Rinsing and re-soaking your plants after applying chemicals to your roof will protect your plants and ensure they continue to thrive after completing this type of treatment on your roof. It is particularly important to include this step when you are aware that some of the oversprays have landed upon your plants.
6. Safely Come Down From Your Roof
After you have applied the treatment all you need to do is to allow this process and the chemicals to get to work. After 2 weeks check on your roof again to assess whether a reapplication is necessary.
Hiring a reputable and experienced roof-cleaning company is the best option if you cannot walk on your roof. They have the correct equipment and tools to protect your roof along with your surrounding vegetation. Keeping your shingles clean is important to ensure a long-lasting roof. Algae can drastically deteriorate your shingles making them weak and brittle. Hiring a roof cleaning company or applying the treatment mentioned above will kill and get rid of algae, keeping your roof clean for up to 3 years.