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On the job site, how can I tell if the roof is satisfactorily cleaned?

April 26, 2017cleaned Job roof satisfactorily site

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On the job site, how can I tell if the roof is satisfactorily cleaned?

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Once the roof has been cleaned and dried, press a 3-4″ long piece of 2″ masking tape to the roof using hand pressure. Then, peel the tape off the roof. If it comes off easily, and or is laden with dirt, degraded roofing materials and other particulates, the roof is not cleaned satisfactorily. Reclean and dry the roof and repeat this test. This test should be conducted in several areas around the roof, especially in ponded or other dirty areas.