Pressure Washing in Cambridge

Galt and Preston grew up around mills on the Grand and Speed rivers, and older streets in mill towns can still have stone steps, retaining walls and foundation walls. Mortar in walls like that may have softened over many decades, and high pressure can blast it out. Concrete, interlock and wood also react differently to water force, so each surface gets its own setting, not one setting for the whole property.

Winter leaves its mark. Road salt leaves a white film on driveways and walks, and freeze-thaw cycles open the surface of older concrete. Pressure washing lifts the film and the dirt, but it can also show how worn the surface is. On aged concrete we test a small patch and keep the nozzle back, because a flaking surface can lift.

Shade is the third factor. North-facing steps, patio stones and walks beside a house wall stay damp, and green algae turns them slick. That is a safety issue as much as a looks issue. Pressure washing starts from $350, and the price depends on the area, the material and the staining. With interlock, hard washing can flush out the joint sand, so we plan to check the joints afterwards.

What we plan for in Cambridge

• Mortar and stone: we look at old joints and step edges first, and choose lower pressure and a wider spray where mortar is soft or crumbling.
• Test patch: on aged concrete we start in a hidden corner to see how the surface responds before washing the whole area.
• Interlock joints: we check the joint sand after washing and tell you if any areas need topping up.
• Shaded walks: we treat north-side steps and paths for algae, and note where a slippery patch may return.
• Runoff: we check where rinse water drains, so it does not run toward a foundation or a neighbour's walk.

Questions from Cambridge homeowners

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