Pressure Washing and Prep in Pasadena

Preparation is most of the labour on an exterior repaint and effectively all of its lifespan. On a Pasadena house the sun exposed walls need more of it than the shaded ones, because ultraviolet has spent years degrading the old film into a layer of loose powder that nothing new will stick to. Cinemadumeep sells this as its own service, partly because some houses need the wash and the prep and do not yet need the paint.

Chalk, and Why It Ends Repaints Early

Run a hand down a faded west wall and look at your palm. If it comes away coated in colour, that is chalk. The resin holding the pigment has been broken down by ultraviolet and is releasing pigment particles at the surface.

Chalk is not dirt. It is the top layer of the coating itself, and it is not attached to anything. Roll a new finish over it and that finish bonds to loose powder rather than to the wall, which produces exactly the failure that gets blamed on cheap paint. It looks fine for a season and then lifts in sheets, usually in the second or third summer, usually on the sun side, because that is where the chalk was thickest.

The fix is mechanical. Wash it off, let the wall dry, and rub test again. If colour still transfers after a proper wash, the wall gets a masonry bonding primer designed to penetrate residual chalk and give the topcoat something to key into. Skipping that primer to save a day is the single most expensive shortcut available on an exterior.

How We Wash

Pressure is a tool, not a virtue. High pressure on stucco drives water into the wall, and high pressure on old wood siding erodes the soft summer growth and leaves a furred surface that will never look right under paint. It can also blow water past flashing and into a wall cavity, which is a problem you will not see until it becomes a much larger one.

So we wash at the lowest pressure that removes what needs removing, use a detergent where the soiling is greasy, and give the whole envelope time to dry before anything else happens. In dry inland weather that is usually a day, longer on a north wall or anywhere shaded by mature planting. On stucco we allow more, because the substrate holds water well past the point where the surface looks dry.

Where there is mildew, and there is more of it on the shaded north side than people expect, it gets treated rather than merely blasted. Mildew is biological and it grows back through paint if the spores are still there.

Scraping, Sanding and Feathering

Failed film comes off back to an edge that will not lift, tested by pushing a scraper under it. Then those edges are sanded so the transition from bare substrate to sound coating is a gradual ramp rather than a step.

That feathering is what stops a repair from telegraphing. Low afternoon sun on a west wall is the most revealing light a house gets, and an unfeathered scrape line shows as a hard shadow the whole length of the wall for the life of the paint job. It costs an hour with the right paper. It is worth every minute.

Lead Safe Practice on Older Houses

A large share of Pasadena’s housing stock was built well before the 1978 ban on lead in residential paint. The Craftsman bungalows, the older Spanish Revival houses and most of what stands in the historic districts all fall on the wrong side of that date.

Disturbing those coatings means containment sheeting on the ground, wet scraping rather than dry, no open flame and no uncontrolled power sanding, and a cleanup that leaves the soil under the wall as clean as it started. It adds days and it adds cost. It is also a legal requirement and a genuine health matter, since the dust ends up in the ground where children play. We do not price a version of the job without it.

Caulking, Priming and the Order of Operations

Caulk goes on after the surface is clean and primed where needed, not before. Joints on the sun side open wider than joints on the shaded side because the daily temperature swing there is larger, so the sun elevations get a closer look and often a full re-caulk while the north wall needs only spot work.

Primers are not interchangeable. A bonding primer solves adhesion over a chalky or glossy surface. A stain blocking primer stops tannin bleeding through from redwood and cedar, which is a real issue on the older siding here. A masonry primer handles the high alkalinity of newer stucco. Choosing one product for all three jobs saves a trip to the supplier and costs you the coating.

When the Wash Is the Whole Job

Sometimes a house that looks tired is simply dirty. Dust off the foothills, road film, a season of Santa Ana winds and a north wall growing a little mildew add up to a building that reads as needing paint when the film underneath is intact and well bonded.

We will tell you if that is your situation. A wash and some spot caulking on a sound exterior buys a few more years for a fraction of the price of a repaint, and there is no sense in spending the larger number early.

Call (626) 333-4716 and we will look at it properly.