Questions About Preparing an Older Carlsbad Home for Exterior Repainting
Older Carlsbad houses raise the same handful of questions when the prep work starts, and most of them come from what turns up once the old paint is scraped back. The answers below come from the repair side of exterior painting: what lies under 1950s and 1960s paint, how crews deal with it, and why some of it has to wait before a brush goes near the wall.
What is usually under the paint on a 1950s cottage?
Cottages and bungalows in the northwest part of town, around Olde Carlsbad and The Barrio, were built with wood lap siding, wood window frames and wood trim. Over seventy years, each of those boards has collected layers of paint, often six or more, and each layer has its own age and chemistry. The old ones are oil based and hard. The newer ones are acrylic latex and flexible. When the layers disagree with each other, the top ones lift, which is why a house can look freshly painted on one wall and be peeling on the next.
Beneath the paint there is often hidden repair history: patched boards, filler that has shrunk, nail heads that have rusted out, and caulk lines laid over caulk lines. A crew reads that history as it scrapes, and the decisions about what to cut out and what to keep come from it.
Does lead paint matter on a house this old?
Lead was banned from household paint in the United States in 1978, so a house built before then may have lead in the older layers. The federal EPA Renovation, Repair and Painting rule sets out lead-safe work practices for paid work on pre-1978 housing: containment, wet scraping, no open flame, no power sanding without a vacuum attachment, and a thorough cleanup. A contractor working on a house of that age should know the rule and be certified under it.
In practice this changes how prep is done. Dry scraping is out, sheeting goes down around the foundation, and loose chips get collected rather than swept into a garden bed. It also changes the order of repairs. Cutting out rotted boards, which is going to release paint dust, is done with the same containment as the scraping.
How is rotted wood found, and what happens next?
A screwdriver does most of the finding. Crews probe the bottoms of window trim, the ends of fascia boards, the corners of sills and anything near a downspout, pressing hard enough to dent sound wood but not hard enough to damage it. Soft wood that crumbles is cut out. A small area gets rebuilt with exterior epoxy, and a long section gets a new board. Either way, the replacement wood is primed on every face, cut ends included, before it goes up.
The repair is not the end of it. Anything that was wet enough to rot is also a clue to a leak, a missing flashing, or a gutter that overflows, and those get pointed out so the water source is fixed rather than painted around.
What do hairline cracks in stucco mean?
Stucco is cement plaster, and cement cracks as it cures and as the house moves with the seasons. Thin cracks in a 1960s ranch home, such as the ones around Calavera Hills and Lake Calavera, are common and usually cosmetic. They still need filling, because water goes into them whenever it rains or a sprinkler hits the wall. Wider cracks, cracks that step, and diagonal cracks that run from the corner of a window point to movement and belong to a plaster contractor before any painter arrives.
Filling a hairline crack takes an elastomeric patching compound pushed in with a putty knife, then a primer coat over the patch, since the compound is porous and shows through the topcoat as a dull streak if it is left bare.
Why does white powder keep coming through the paint?
That powder is efflorescence, a mineral salt carried to the surface by moving water. It means the wall is wet from somewhere, and painting over it only hides it for a few months. The salt pushes through the new coat as blisters or a chalky film. The fix starts with finding the water: a leaking hose bib, an overwatered planter against the wall, a failed window flashing, or soil piled over the base of the stucco. The salts get brushed off, the source gets corrected, the wall dries, and then a masonry primer goes on.
Can the whole house just be pressure washed first?
Washing helps on sound surfaces, and it is hard on old ones. Water driven upward under lap siding soaks the sheathing behind it. A hot narrow jet digs the soft wood out of old redwood and leaves ridges. Open stucco cracks take water straight into the wall. For these reasons crews on old houses use a wide fan tip, aim downward, keep the wand back from the wall, and sometimes switch to a low pressure rinse with a soft brush. After a wash, the wall needs several dry days before any repair starts, since filler, caulk and primer all cure badly on wet surfaces.
How long should repairs cure before painting?
The product label sets the answer, and it varies with depth, temperature and humidity. Exterior epoxy filler may be hard enough to sand within hours and ready for primer the next day. A deep fill of patching compound can stay soft in the middle for longer than the surface suggests. Caulk skins over first and cures from the outside in, so a thick bead painted too early wrinkles. The rule of thumb on the job is to wait until the repair is fully hard, then sand it flush, then prime it.
Weather decides the rest. Marine fog on the coast side of Interstate 5 keeps the air damp in the morning, and winter rain slows everything. The best days for repairs are dry afternoons, and the best season is the long dry stretch when Carlsbad collects most of its sunshine.
What about the old Carlsbad houses with unusual details?
Houses near the Old Santa Fe Depot, built in the early part of the twentieth century or earlier, can have wood details that have been replaced piece by piece over the decades, with different woods and different paints layered together. Those are the jobs where more of the trim gets probed and more boards get replaced, and where the schedule has to allow for surprises once the scraping begins.
Do newer communities need this kind of prep?
Newer homes in Aviara, La Costa and Bressi Ranch have younger stucco and fresh sealant, so the prep is lighter, but the same problems show up in smaller form. Sealant joints on sun-facing walls shrink and split, hairline cracks open at window corners, and wood trim in shaded corners can go soft where a gutter overflows. The probe and the moisture check apply just as much.
Prep on an older Carlsbad house is mostly repair work, and the paint goes on last, after every soft board and cracked joint has been fixed and has had time to dry.