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Old 04-22-2012, 10:44 AM   #1
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Pressure washer nozzle Q

I have a 4k 4gpm pump. I am wanting to reduce the pressure but not flow using the correct orifice # for a 40 degree tip. What would be a good orifice # for washing decking when stripping old stain? Thx!


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Old 04-22-2012, 11:09 AM   #2
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Please excuse my ignorance, but if it is a wood deck the wood will "hair up" from the PW blast before any stain can be removed. The only way I understand that stained wood can be returned to a natural state is by sanding it down to bare wood. Others in the know will be along shortly though. good luck


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Old 04-22-2012, 11:30 AM   #3
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Jeeps right, unless it's a soild stain or paint that peeling off the deck a pressure washer is not going to take it off. Stain is just that, a stain deep in the grains of the wood.
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Old 04-23-2012, 10:15 AM   #4
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Although you can strip-off paint, you cannot "strip-off" stain. It is proper procedure to pressure wash (clean) a deck, and allow it to dry, before re-staining.

Some information here, including recommended pressure:
- Build Well -
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Old 04-23-2012, 11:58 AM   #5
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nozzles site fro ACR, but I think you are using way TOO much pressure for a deck. Dial back you unloader to 1200 psi
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Old 04-23-2012, 12:03 PM   #6
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Like Randy said, dial back the unloader or go with a tip some where's .072 orifice and that should lower you pressure to about 1000 psi. You will need a good deck stripper followed up with a neutralizer/brightener.


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