Toolbert
Stainless
- Joined
- Nov 29, 2003
- Location
- Vashon Island, WA
I've long been aware that you aren't supposed to pressure-wash composition roofs. But I have a moss problem and for other reasons, the usual moss-killing chemicals are not an option.
An acquaintence is recommending that I go with a "new" pressure washing company, dedicated to cleaning comp roofs using a 1000 psi 10 gpm pump and a special roof-cleaning wand, that his company says is faster and far less damaging to comp roofs than "traditional" pressure washing at 2500 to 4000 psi, 3 gpm. Says while it's still damaging, it's ... less damaging.
I've spent a couple hours googling and reading and have found absolutely nothing that gives an objective opinion of this "new" method. Most of the shingles in question are "50 year" architectural grade, 5 to 10 yrs old. I gotta do something, but the last thing I want to do is destroy all that roofing 40 years before it's time.
Anyone have specific knowledge of this high-flow, relatively low pressure cleaning? I need to decide whether the damage is an acceptable tradeoff.
thx
Bob
An acquaintence is recommending that I go with a "new" pressure washing company, dedicated to cleaning comp roofs using a 1000 psi 10 gpm pump and a special roof-cleaning wand, that his company says is faster and far less damaging to comp roofs than "traditional" pressure washing at 2500 to 4000 psi, 3 gpm. Says while it's still damaging, it's ... less damaging.
I've spent a couple hours googling and reading and have found absolutely nothing that gives an objective opinion of this "new" method. Most of the shingles in question are "50 year" architectural grade, 5 to 10 yrs old. I gotta do something, but the last thing I want to do is destroy all that roofing 40 years before it's time.
Anyone have specific knowledge of this high-flow, relatively low pressure cleaning? I need to decide whether the damage is an acceptable tradeoff.
thx
Bob