Pressure Washing · Morro Bay
Pressure Washing in Morro Bay
What is holding the color on a Morro Bay slab is living growth, not dust, and pressure on its own takes the top off it and leaves the rest to come back. The second constraint is where the water goes, because this town drains to the bay.
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Concrete that never finishes drying grows something pressure cannot finish
A patio in San Luis Obispo gets six or seven hard dry hours most days between May and October, and that dry spell is what keeps growth from ever getting established in the pore. Morro Bay slabs frequently do not get it at all. The fog can hold from dawn to dusk, so the shaded side of a walkway stays damp for weeks at a stretch, and what takes hold there is a green black film that keys down into the concrete rather than sitting on top of it. That is why a Morro Bay slab looks dirty in a way that sweeping never touches.
It also changes what a wash is actually doing. High pressure takes off everything above the surface, so the slab comes up looking right on the day, but the part living inside the pore is untouched and this town hands it moisture again that same night. Inland you can get away with that because the next four dry months do the killing for you. Here the regrowth clock is measured in months. The honest version of this job in Morro Bay is pressure plus a treatment that kills what is in the pore, otherwise you are buying the same slab twice a year.
Then there is gravity. Morro Bay lots step down toward the water, so anything lifted off a driveway or a path runs downhill to the street on its own, and the street drains toward the bay and the estuary. That is not an abstract concern in a town built around an estuary and a working harbor. It means the heavy material gets swept and lifted dry before any water is turned on, and the rinse gets directed into planting or held back rather than allowed to sheet into a curb inlet.
What changes in Morro Bay
Green film, not gray dust
Around Paso Robles and Templeton a slab is carrying harvest dust and tire black, and volume of water does most of the work. In Morro Bay it is a living film that has keyed into the pore of the concrete. Blasting it removes the color and leaves the organism, which is why the same patio here looks clean in March and green again by August.
Everything you loosen runs downhill to the bay
On a stepped lot above the water there is nowhere for slurry to sit, so it heads for the street, and Morro Bay street drainage ends up in the bay and the estuary. Heavy material comes off dry first, rinse water gets pushed into landscaping, and the low end of the run gets blocked off. On a flat Atascadero lot none of that sequencing is necessary.
Blown sand is an abrasive, and it gets under everything
Up at the north end and around the Cloisters, wind carries sand off the dunes onto driveways and paths all year. Running a surface cleaner straight over dry sand grinds it into the concrete and takes the machine with it. Sand comes off first, dry, before any pressure goes near the slab. That step is pointless three miles inland and essential here.
Salt weathered concrete wants less pressure, not more
Flatwork near the waterfront and at the bottom of the hill has taken decades of salt, and the surface paste on old coastal concrete is softer than it looks. A narrow tip lifts it and leaves permanent wand striping. Wide fan and a surface cleaner, always. The wooden decking along the water is not a pressure job at all and never will be.
How often, here
Most Morro Bay flatwork wants doing once a year, and a north facing path or a shaded side yard down toward the estuary can want it inside six months. Compare that with Paso Robles, Templeton and Creston, where the dirt is dust rather than growth and a slab comfortably goes two years or more because the dry summer sterilizes it for you. San Luis Obispo sits between the two. Baywood-Los Osos is on a similar cycle to Morro Bay but its worst concrete is usually under tree shade, where here it is simply anything the fog reaches, which is nearly everything.
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Questions from this area
Why does the green come back on my Morro Bay patio a few months after pressure washing?
Where does the wash water go when you pressure wash a property in Morro Bay?
Can you pressure wash a steep hillside driveway in Morro Bay?
Can you pressure wash the black growth off a Morro Bay house or roof?
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