It is not wide compared to a 40 foot wide barn roof. I installed it on the 22 foot long extension handle. I have a 3/12 slope roof. I climb a ladder and spray water up to the 18 foot peak. I use a garden sprayer to spray diluted Dawn onto the moistened roof. Then I use this brush and the handle to go up and down 4 times. The bristles work the grime loose from the panels and screw heads. Then I use the water hose to rinse the loosened grime down to the gutter. I work on 5 panels as a block. Each panel has 4 flats. The brush does 1 flat at a time. Then I shorten the handle and brush the next 5 feet. It is best to select a cloudy day to retard evaporation/drying before the final rinse.
Rating: [5 of 5 Stars!]