When you research roof cleaning on the Internet, you will find claims, counter-claims, arguments and outright confusing and conflicting information among the different roof cleaning methods.
We have attempted to provide some clarification here regarding the three main types of roof cleaning methods most widely available to consumers:
- No Pressure “Soft Wash” Cleaning Method
- Low Pressure Cleaning Method
- High Pressure Power Washing Method
No Pressure “Soft Wash” Roof Cleaning
No Pressure = No Damage! The Soft Wash Roof Cleaning method uses less pressure than a garden hose, Soft Wash Roof Cleaners usa a ratio of Sodium Hypochlorite (the same chemical used in swiming pools) to apply an algae killing solution that is mixed specifically formulated for roof cleaning. In most cases, they don’t even have to get on your roof. Like the low pressure method landscaping needs to be kept watered during the application process.
Low Pressure Cleaning Method
The Low Pressure process incorporates a lye based soap solution “sodium hydroxide”, that is sprayed on the roof and soaks for approvimately 20 minutes. It is safe on landscaping around the home, providing you water the areas down during the application process.
This process uses a 1100 psi power washer connected to a 30″ surface washer to pressure clean your roof. During this process your home will experience granular loss. This does damage the shingles like a high pressure rinse or scrubbing would.
High Pressure Power Washing Method
Roof cleaning contractors that use high pressure power washers to remove roofs stains are blasting the limestone granulars off as they clean. This method is damaging to your roof shingles, but it’s also not an effective way to remove organisms that cause roof stains. The high pressure power washing method leaves the organisms behind, so the algae will often return.