Roof with debris prior to cleaningAs happens to some customers of insurance companies when the policy is changed to a new company the underwritting inspection can reveal the need for roof cleaning. The report often describes the presence of organic material on the roof. So needs to be cleaned and documented for the insurance company.
The back of the house has a flat roof and over hanging branches from spruce trees. Being flat there is not a lot of rain fall that pushes the debris off the roof. The interesting thing is even with a strong back pack blower the needles did not move they stayed clumped on the roof.
The customer is changing insurance companies and the inspection of the house resulted in some changes be made. The reason I was working on the house is they requested the roof be cleaned so that water would not get under the shingles and or the roof's life span be shortened. The insurance company also requested that the trees near the house also be pruned or removed. This will let in more light and help prevent the mold and mildew from reforming.
This first picture shows the worst accumulation of mold moss and lichen has formed under where the tree is. It also gives me a chance to show the before and after picture when the growth has washed off in the rain. The greatest change shows up after a couple of rain storms that washed the dead moss and mold off the roof. It just brightens up. Right after the application some of the stuff on the roof stays and has a dirty brown link since it is still clinging to the roof. Since no pressure is used in the application process the final effect to be fully visible takes some time to show up.
An insurance company did a site visit of a new customer to finalize the underwritting of the policy. They requested that the roof be cleaned of organic material and it must be done promptly. Getting the call to clean the roof I let the customer know that I do not use a pressure washer to clean a roof rather low pressure application of a cleaning solution that kills all material on the roof that grows.
Arriving at the house there certainly was a lot of dark streaking on the roof and at the bottom of each shingle at the edge a bunch of growth was there. Looking at it since it was so low I thought it was lichen. But as I got closer and started to look it turned out to be moss that was lining the edge along the shingle. Sort of like a fringe.