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Old 08-31-2011, 12:26 PM
Zen Lawn Zen Lawn is offline
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Why can't a pressure washer be used to soft wash?

I apologize if this has been covered before- I did search the forum and couldn't find where this subject was posted...

From what I understand, a soft wash is often defined as using low pressure, high volume with chemicals to clean roofs (especially asphalt shingles) to prevent unnecessary wear.

If using a tip that lowers the pressure enough that you can use it on your hand without taking off the skin, wouldn't that be comparable to a 12v softwash system? Wouldn't the black or white tip be safe to use on asphalt shingles?

Also, I've heard pressure limits set at 300 psi and 550 psi for composite. Could I get something comparable with a high pressure nozzle (for garden hose) or a pressure wand? What does 300-550 psi look like?

James
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Old 09-01-2011, 11:09 AM
Zen Lawn Zen Lawn is offline
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Maybe this subject has already been beat to death and I still haven't understood it yet...
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Old 09-01-2011, 05:27 PM
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HighTide HighTide is offline
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Yes, I soft wash houses all day in the way you just described. However regarding the cleaning of roof shingles, you will not be able to get a strong enough chemical on the roof by downstreaming via the pressure washer. A 12 volt pump is the most popular means to get the stronger chemicals applied to a roof. Spray the roof chemicals on then go collect your check!
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Old 09-02-2011, 07:23 AM
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JCinNJ JCinNJ is offline
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Quote:
Originally Posted by HighTide View Post
Yes, I soft wash houses all day in the way you just described. However regarding the cleaning of roof shingles, you will not be able to get a strong enough chemical on the roof by downstreaming via the pressure washer. A 12 volt pump is the most popular means to get the stronger chemicals applied to a roof. Spray the roof chemicals on then go collect your check!
+1 - with the dedicated roof pump you can apply full strength or go the other direction and apply so weak you can drink it.

With downstreaming a full strength mix still gets diluted and becomes even weaker
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Old 09-02-2011, 09:55 AM
Zen Lawn Zen Lawn is offline
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JC and Hightide- I understand now- a lot has to do with the mixture percentage.
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Old 10-09-2011, 02:08 AM
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Roof Cleaning Raleigh, NC Roof Cleaning Raleigh, NC is offline
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Rain knocks some of the granules loose. Think what 300 psi would do.
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