The difference between an exterior paint job that lasts 8–12 years and one that starts peeling in 3–4 years is almost entirely prep. Paint is the finish. Prep is what makes it stick. Here's what proper exterior prep involves and why every step matters in the DMV climate specifically.
STEP 1: PRESSURE WASHING
Nothing goes on a dirty surface. Every exterior paint job starts with pressure washing the entire surface — siding, trim, soffits, fascia. This removes dirt, mildew, pollen, and chalked-off paint residue that would prevent adhesion. We use a low-pressure soft wash with a cleaning solution on siding (high pressure can damage wood fiber and drive water behind panels) and higher pressure on masonry and concrete.
The surface needs to dry completely before any work continues — typically 24–48 hours depending on temperature and humidity. Painting over damp surfaces is one of the most common causes of premature paint failure.
STEP 2: SCRAPING AND SURFACE REPAIR
Any paint that's peeling, bubbling, or loosely adhered has to come off before repainting. Painting over failing paint transfers the failure to the new coat — you'll peel again within a year. On older homes, peeling paint should be tested for lead (homes built before 1978) before scraping — lead paint requires specific containment and disposal procedures.
After scraping, bare wood needs to be primed before topcoating. Any rotten wood needs to be replaced or stabilized with a consolidant and filler — paint doesn't fix rot, it just covers it temporarily.
STEP 3: CAULKING AND SEALING
All gaps at windows, doors, trim joints, corner boards, and where siding meets trim need to be caulked before painting. Failed caulk lets water behind the siding, which causes rot, paint failure, and eventually structural damage. We use a paintable elastomeric caulk that flexes with the expansion and contraction cycle the DMV's temperature range puts on exterior materials — cheaper caulks crack and fail within a few years in this climate.
STEP 4: PRIMING THE RIGHT SURFACES
Bare wood always gets primed before topcoating — end grain especially, which is the most vulnerable to moisture absorption. Stain-blocking primer on any areas with tannin bleed (common on cedar and redwood). Spot-priming repaired areas. On a full repaint of a home that was well-maintained, full-surface priming may not be necessary — but any bare or repaired areas always do.
WHAT THE HOMEOWNER NEEDS TO DO
- Move vehicles from the driveway and away from the house perimeter
- Remove or relocate potted plants, furniture, and decorations near the house
- Trim back vegetation that's grown against or near siding — anything touching the house stays wet, accelerating paint failure and inviting rot
- Arrange for pets to be kept away from the work area
- Identify the location of any exterior outlets, hose bibs, and HVAC equipment so we can protect them
Timeline note for the DMV: exterior painting requires several consecutive days without rain and temperatures between 50°F and 90°F. That puts the ideal windows in late spring (May–early June) and early fall (September–October). Summer is workable but the afternoon humidity and heat slow dry times and require scheduling morning application. We plan exterior jobs around the forecast and communicate any weather-related adjustments in advance.
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