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I was just reading another post about this earlier...

I'm not a vet by any stretch of the imagination when it comes to roof cleaning.
But I've been in businesses for years and have family who are builders and such so if you don't mind here's my opinion on warranties...

1. They're not free
2. They should last as long as the price dictates.
3. They should be VERY specific.

In another industry we warranty our work for 10 years with very specific details on what is and is not covered. We also require the homeowner to do a maintenance through us on the job every 3-5 years or whenever"blah, blah" and give them specific signs to look for. Put this on the homeowner to save your butt.

You might consider:

1. A "X" number of year warranty if the customer does an annual inspection and "maintenance" cleaning (read: spot clean) This might be done for as little as $100.00 a year.

2. A warranty with a built in "pro-ration" clause. Meaning you warranty the roof for say 2 years. If the client calls you back to remove moss/algae in less time you charge them a pro-rated amount for the difference. For example: A $500 clean w/ 2 year warranty that gets a call back in 20 months gets $85.00 off the next roof clean.


Just some thoughts...