Join Date: Feb 2017
Location: 95 Greene ST Ste 401 New York, NY 10012
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.
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.
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.