Pressure washing stonework

Is it safe to pressure wash exterior stonework to clean it up?

Asked by Jenny on 15th Jan 2023
Expert Trade Answers
"Yes, absolutely. Just don’t go close enough to damage the stone or blast out the mortar.
Power washing is the best and most effective way to clean masonry."
Answered on 15th Jan 2023 - Member since Nov 2022 - report
"You can pressure washer stonework although if the mortar joints are weak in places it could blow them out which would mean you would need to re-point places"
Answered on 15th Jan 2023 - Member since Dec 2022 - report
"We have pressure washed stonework for years, care must be taken if the stone face is laminating or the lime mortar joints are perished, try to concentrate on the stone face.
No problems."
Answered on 15th Jan 2023 - Member since Oct 2022 - report
"Very dependent on the machine being used. We have a DOFF machine which has a very high temperature. Using a high temperature and lower pressure works well when cleaning more delicate projects."
Answered on 7th Feb 2023 - Member since Feb 2023 - report
"Yes but if pointing loose you could remove this also . But its not a problem"
Answered on 15th Jan 2023 - Member since Sep 2017 - report
"yes if its not a soft stone like sandstone, keep the pressure quite low to start off, if you are only washing moss and algea it should be ok but if your trying to remove carbon deposits or old stone you will need to use acid to break it down, or use someone experienced in stone cleaning, hope this helps"
Answered on 15th Jan 2023 - Member since Apr 2019 - report
"Hi, I would recommend soft cleaning with the right treatment applied first."
Answered on 15th Jan 2023 - Member since Jan 2023 - report
"It depends on what is needing cleaned off, paint, carbon etc. A DOFF system is the preferred method of cleaning sandstone."
Answered on 15th Jan 2023 - Member since Aug 2020 - report
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