Exterior Paint / Siding Estimator

Why Power Washing is Ruining Your Siding (And What to Do Instead)

The pressure washer feels like the pro move, and it is the most common way DIYers wreck a paint job before it starts. At 2,000-plus PSI the stream drives water behind vinyl and lap siding, where it sits against the sheathing and rots things you will not see for two years. It also furs wood fibers and blasts off paint that was still bonded, doubling your scraping work.

The contractor way is boring and it works: garden hose, TSP or a dedicated house wash, and a soft-bristle car-wash brush on an extension pole. Scrub top-down, rinse, and let it dry. If you absolutely need a pressure washer for grime or mildew, keep it under about 600 PSI with a wide 40-degree fan tip, hold the wand moving, and never aim up under siding laps. While the house dries, it is a decent weekend to knock out other exterior wood — our deck and fence material calculator sizes stain for those projects the same afternoon.

The “Chalk Test”: How to Know if Your Exterior Paint is Failing

Rub your palm flat across the wall in a few spots and look at your hand. A light dusty film means the paint is chalking — weathering, but still serviceable after a good rinse. Heavy chalk that covers your palm means the binder is breaking down, and paint rolled over chalk sits on powder and flakes off with the next hard winter.

Chalking paint needs a thorough wash and a bonding primer before anything else goes on top. No topcoat fixes a failing substrate; it just delays the callback. Do the test on each wall separately — south-facing walls chalk years faster than the north side of the same house, and they often need different prep.

Renting an Airless Sprayer vs. Rolling: The Honest Math and Time Comparison

Airless rentals run roughly forty to eighty dollars a day, and a sprayer puts two coats on a house in the time rolling takes to finish one. The honest catch: masking takes hours, cleanup takes another hour of flushing the pump, and overspray does not respect property lines — cover your neighbor’s car even when the wind looks calm, because wind changes mid-pass.

The honest verdict: on stucco, brick, or houses over about 2,000 square feet, the sprayer earns its rental fee because rollers fight texture all day. On smooth vinyl under 1,500 square feet, rolling is slower but cheaper and more forgiving for a first-timer. The middle ground — textured wood at 1,500 to 2,000 square feet — comes down to whether you value your weekend or your rental fee. And if the power blinks mid-project, our home generator size calculator sizes backup power for the washer and sprayer.

Dealing with Peeling Paint and Bare Wood Spots

Scrape only what wants to come off. A carbide scraper pulled flat along the siding removes loose paint without gouging, and you stop when you reach paint that is stuck. Feather the edges with 80-grit so the transition disappears under the new coat, and wipe the dust.

Then the order that actually holds: caulk the gaps first, let the caulk skin over, spot-prime every bare wood and bare metal spot with exterior bonding primer, and let the primer dry fully before body paint. Priming over caulk seals both at once; caulk over paint is a peel waiting to happen. Bare wood left unprimed under topcoat drinks the paint unevenly and flashes dull patches in raking light forever.

Why You Should Never Paint Exterior Walls in Direct Sunlight

Paint on a sun-baked wall dries before it levels. The brush and roller marks set in place, the film skins before it bonds, and the lap marks show from the street. Work the shade around the house: east walls in the afternoon, west walls in the morning, and take the south wall early or late.

Watch the conditions, not the calendar: air and surface between 50 and 90 degrees, no rain forecast within 24 hours, and stop early enough that the coat sets before evening dew settles on it. Dew on uncured paint leaves a shiny, sticky film that no amount of second-coating fixes cleanly. Those forced drying hours are a good time to plan the interior rooms that are next — our interior room paint estimator sizes those gallons while you wait on the weather. And if the project includes opening up exterior walls, size the cooling for the new layout with our room AC BTU calculator.