Monthly Archives: October 2017

Delamination of Composition Shingle

Think of having your roof moss pressure washed? We have often heard that “It’s low pressure” it won’t harm the shingles by using more water volume and less water pressure. While the damage to the top of the shingle may or may not be as severe. The damage often lies underneath. Watch what happens when we lightly blow across the shingles simulating a small gust of wind.

Roof Destroyed by Pressure Washing

Here’s another photo of a composition roof in Portland, Oregon that was Pressure Washed at some point. You can see the massive granule loss associated with aggressive moss cleaning techniques such as pressure washing and wire brushing.

roof moss cleaning Portland

Roof Damaged by aggressive cleaning of moss

roof cleaning damage

Pressure washing damage caused by roof cleaning