Soft washing is safe, and on the newer Star housing stock it is genuinely important. Modern construction leans heavily on hardie and stucco, and both are materials where a pressure washer causes damage that will not be apparent until well after whoever did it has gone.
There is an assumption that a recently built house can take anything. Hardie board and stucco are both porous systems that rely on staying sealed, and pressure forces water through them into the sheathing behind. The wall looks perfect that day, which is the whole problem.
New builds carry a film of concrete dust, drywall residue and site grime that is alkaline and lightly bonded. That responds to the right cleaning solution at $0.18 per square foot far better than it responds to force, and force risks the cladding.
Some siding manufacturers set out cleaning requirements, and pressure washing outside those can affect a warranty on a house new enough to still have one. That is worth checking before anyone points a wand at it.
New driveways and patios are pressure washed at $0.20 per square foot, including the haze fresh concrete often carries. Surface type decides method, every time.
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Yes, and it is the appropriate method. Pressure forces water through both into the sheathing behind.
New does not mean impervious. Hardie and stucco rely on staying sealed, and pressure compromises that.
Possibly. Some manufacturers specify cleaning requirements, which is worth checking on a newer home.
With appropriate cleaning solution at low pressure. It is alkaline and lightly bonded, so chemistry works better than force.
House washing is $0.18 per square foot; flatwork pressure washing is $0.20 per square foot.
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