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I have to submit an estimate on a cedar roof.I have done a number of them over the years but not enough too consider myself an expert.The question i have is this roof has very heavy moss although the roof is not yet rotted. i scrapped a section with a paint scraper.Anyboby have experience with this heavy moss,Am i better off scraping first.I would say it is too heavy for a low pressure wash.Also what is approx. going rate it is about 3500sq.ft. Thanks in Advance