Roof staining organisms such as algae, lichens and moss feed off the organic material in shingles. In other words, they eat the roof. The longer they go untreated, the more damage they will cause.
Homeowners often find confusing and conflicting information when researching roof cleaning services. To assist homeowners with making informed decisions when deciding on which roof cleaning contractor to hire, this article describes the differences between the three main roof cleaning methods.
1. The eco-friendly, non-bleach, low pressure roof cleaning method
Roof cleaning companies that use this method use high-grade eco-friendly products that do not contain toxic chemicals such as chlorine-bleach, phosphates or other chemicals that can kill vegetation and pollute waterways. This method also uses a low-pressure rinsing system, avoiding the use of damaging high pressure scrubbing or brushing.
Pros: Typically, the results with this method are instant and complete. Algae, lichens, and moss are completely gone before the contractor leaves the property. Technicians use eco-friendly roof cleaning products such as roof shampoo and equipment designed precisely for safe, gentle roof cleaning. Contractors who use this method clean the roof while preserving the integrity of the shingles and without damaging the landscaping.
Cons: This method may cost a bit more due to the cost of high quality eco-friendly products vs. inexpensive chlorine bleach mixtures.
Tip: When hiring a contractor who uses this roof cleaning method, pick one who guarantees that the algae, lichens and/or moss will be completely gone before they leave your house. Also, look for a contractor who offers an annual roof stain prevention program.
2. The chlorine-bleach roof cleaning method
Roof cleaning contractors who use sodium hypochlorite (chlorine bleach) mix it in high concentrations with other chemicals such as trisodium phosphate, also known as TSP.
They spray it on the roof and wait for it to dry and then re-apply it several times as needed. Stains and moss or lichens that don’t come off on the day of treatment may eventually come off with rain in the months to come.
Pros: The bleach method can be less expensive than other methods because the chemicals are inexpensive and the technicians generally don’t get on the roof to rinse or inspect after the application.
Cons: Strong chemical odor and results that may not be instant, particularly when moss and lichen colonies are involved. There is also a possibility of posing harm to people and pets if exposed to the fumes or fluids. The effects of bleach on landscaping can cause permanent damage to plants, trees, grass and shrubs. Contaminating bleach and phosphates can leak into waterways in watershed areas.
Tip: Roof cleaning contractors who use chlorine-bleach typically don’t advertise or divulge that they use bleach. If they need to wet down plants before, during, or after treatment or use a runoff recovery system or cover plants during the roof cleaning process, these are indicators that a harsh chemical such as chlorine bleach is being used.
3. The high-pressure power washing method
Some roof cleaning contractors use high pressure power washing methods to attempt to remove roof stains.
Pros: Can’t think of any.
Cons: Not only is this method damaging to shingles, but it’s also not an effective way to remove organisms that cause roof stains. The high-pressure power washing method leaves root systems behind, so the algae will often return rather quickly.
Tip: If you’re not sure if the contractor will be using damaging high pressure, ask him to hold his hand under the spray. If he can’t do that, then the pressure is too high and can damage your shingles.
Knowing the pros and cons of the three main types of roof cleaning services means homeowners will be well prepared to ask the right questions to make informed decisions. Not only will removing ugly roof stains greatly improve a home’s curb appeal, but the roof will be restored to its natural and healthy energy efficient state. A clean roof is a healthy roof that should last for years to come.
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