Quick answer
Pressure washing uses high water pressure and suits hard surfaces like concrete driveways and walkways. Soft washing uses low pressure and is the safe choice for delicate surfaces — siding, stucco, roofs and painted wood — where high pressure can force water behind materials or strip finishes. Using high pressure on the wrong surface is a common cause of home damage.
The key difference
It comes down to pressure. Pressure washing blasts away dirt with force — great on concrete, terrible on shingles. Soft washing cleans with low pressure and the right approach, letting you clean delicate surfaces without driving water where it shouldn’t go.
What to pressure wash
- Concrete driveways, sidewalks and patios.
- Some hardscaping and durable masonry.
What to soft wash (not pressure wash)
- Siding & stucco — high pressure forces water behind it, risking moisture damage.
- Roofs & shingles — pressure strips granules and voids warranties.
- Painted or stained wood — pressure gouges and peels.
- Windows — never pressure wash glass or seals; use the gentle pure-water method.
Why this matters in Calgary
Calgary’s freeze-thaw cycles already stress siding, sealants and roofs. Forcing water behind siding or under shingles with a pressure washer can turn into hidden moisture damage over winter. When in doubt, soft wash.
Cleaning your whole exterior
Windows, screens, gutters and panels are all part of a fresh exterior — see the spring checklist. Get a free quote and we’ll point you to the right method for each surface.
Frequently asked questions
What’s the difference between pressure washing and soft washing?
Pressure washing uses high water pressure for hard surfaces like concrete; soft washing uses low pressure for delicate surfaces like siding, stucco, roofs and painted wood, where high pressure can cause damage.
Can you pressure wash siding and roofs?
It’s risky. High pressure can force water behind siding and strip shingle granules. Soft washing is the safe choice for siding, stucco and roofs.
Should windows ever be pressure washed?
No — pressure can damage glass seals and force water inside. Windows should be cleaned with a gentle pure-water method.
