It is funny. I have seen so many companies try to make the lifetime warranty with an every 6 months booster treatment work. It never has anything to do with keeping the roof clean but rather keeping in the home owners wallet with a reoccurring revenue business model. In every case these companies and even franchises either fail or do not grow as expected.
The American consumer has been programmed to expect a warranty on everything. If it doesn't have a long enough one you can even purchase an extended warranty. TVs have warranties, lawn mowers have warranties, dishes have warranties. However these warranties are not guarantees. A guarantee is much different than a warranty.
Webster online defines a guarantee as this,
1guar·an·tee noun \ˌger-ən-ˈtē, ˌgär-, ˌga-rən- also ˈger-ən-ˌ or ˈgär-ən-ˌ, ˈga-rən-ˌ\
Definition of GUARANTEE
1 : guarantor 2 : guaranty 1 3 : an assurance for the fulfillment of a condition: as a : an agreement by which one person undertakes to secure another in the possession or enjoyment of something b : an assurance of the quality of or of the length of use to be expected from a product offered for sale often with a promise of reimbursement 4 : guaranty 4 See guarantee defined for English-language learners » See guarantee defined for kids » Examples of GUARANTEE
The washer comes with a guarantee against major defects. They wanted a guarantee that the document was authentic. They want the new contract to include a guarantee of job security. The U.S. Constitution includes guarantees against unreasonable searches. He cited the First Amendment guarantee of free speech. And as key pieces of the infrastructure are knocked out, there is no guarantee that they will be repaired or rebuilt, at least not as they were before. —Naomi Klein, Harper's, October 2007
1 a : a real covenant binding the grantor of an estate and the grantor's heirs to warrant and defend the title b : a collateral undertaking that a fact regarding the subject of a contract is or will be as it is expressly or by implication declared or promised to be 2 : something that authorizes, sanctions, supports, or justifies : warrant 3 : a usually written guarantee of the integrity of a product and of the maker's responsibility for the repair or replacement of defective parts See warranty defined for English-language learners » See warranty defined for kids » Examples of WARRANTY
So on Average, how long will a roof stay clean after being soft-washed? I'm hoping this is a simple question answered in the form of the number followed by the word years? Also in order to complicated the question a little more, if a roof was cleaned in florida at the same time as a roof in PA, the roof in PA should stay clean longer, bc of how fast the algae grows in the florida climate correct?
My soft washing process lasted about 5 years on shingle roofs here in Florida, about 3 years on tile. In the begining I had about 20 test roofs in a neighboorhood called Orange Park Village on Red Bug Lake Rd in Casselberry, Fl that when they reached a year old I gave a year warranty. Then at two I gave a two year warranty, and so on. Shingle roofs are by far the easiest roofs to keep clean from black GM streaking.
In PA you actually have a very favorable climate for growing roof funk. Much like FL you are surrounded by water on almost three sides. Your winter keeps the GM growing season short but you still have a great deal of humidity. I bet you will see simular numbers as FL.