David Myers
New member
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I think the 2000 may be close, but I really have to say you need to reevaluate your method. The method you are thinking of using is not efficient for this type of high volume work.
500 foot perimeter x 30 feet high at least a $1500~$1800 job and done in 6 hours with an 8gpm pressure washer.
To answer your question between, 20-40 gallons depending on how your experience, how you spray,wind, and other factors. You will also double to triple the time it will take, have a lot of ladder work-movement etc, vs down streaming. I would strongly recommend you downstream this job. You can certainly use a dedicated pump, but IMO you would be creating far more work for yourself than is necessary. Feel free to call me if I can help you David.
When you call Paul get some blue voodoo as well.