Interior painting, patching and touch-ups in Los Angeles

Fresh joint compound is far more porous than a wall painted five years ago. Roll straight over an unprimed patch and it dries to a different sheen, a shade deeper than the wall around it. Painters call that flashing. Spot-prime the patch and it doesn’t happen.

Color is the other half, and it fails two different ways. A formula off the old can in the garage, or off a fan deck code somebody penciled on a stud, matches a color that hasn’t existed on that wall in years, because sun and cleaning have faded and burnished what’s up there. Scanning the wall itself gets closer and still misses. The scanner averages a coin-sized spot, it reads nothing about sheen or burnish, and a match that looked right under the store lights goes off in the warm afternoon sun through a west window. Coating the whole wall and breaking at the inside corners is what makes it disappear. Builder flat in a rental is worse again, since it burnishes wherever hands and furniture touch it.

Ceilings and raking light

Low light travels across a ceiling from every window and shows up every hump, edge and sheen change. A patch that vanishes at 10am announces itself at 4pm. On a ceiling the break is the whole ceiling.

Roughly half the housing in the City of LA predates 1960, and that bracket covers two different walls. Up to about 1935 you get three-coat plaster keyed through wood lath. From the mid-thirties into the fifties it’s usually two coats over gypsum rock lath. Pull a switch plate and look at the cut edge. Drywall reads about half an inch. Rock lath and plaster reads about three quarters. Three-coat over wood lath reads closer to a full inch.

Now press the wall around the damage. If a wood lath wall flexes, the keys behind it have snapped off, and painting over a field that moves puts the crack back within a season, so plaster washers go in before any filler. Rock lath has no keys to lose. When that one moves you’re chasing lath that has pulled away from the studs, and it gets screwed back before a trowel comes out.

Calcimine ceilings

Houses from about 1900 to 1940 often carry a chalk-and-glue distemper coating on the ceiling plaster. Latex grips it a few months, then releases in sheets the size of a dinner plate. Rub a damp white rag across it. If the rag loads up with white chalk, that’s calcimine, and it gets washed off or sealed with a calcimine recoater.

Pre-war trim and whatever is already on it

Interior casing, baseboard and picture rail in a 1910s or 1920s LA bungalow is Douglas fir, and it’s about as likely to be stained and clear-finished in shellac or varnish as it is to be enameled. Painted fir trim in these houses is often a later remodel, not the original. The prep splits on that. Waterborne enamel over aged oil gloss that hasn’t been sanded peels off with painter’s tape or a fingernail, and waterborne over old shellac is no better.

The alcohol test gets misread all the time. Wipe a hidden spot with denatured alcohol, and a film that goes tacky and lifts means latex or shellac. Alcohol is the solvent shellac is made with, so clear-finished 1920s casing reads exactly like latex and a homeowner walks away thinking the trim is safe to recoat. Follow with mineral spirits or acetone if you want to separate the two. Or skip the guessing on any unknown aged finish, scuff-sand it, and put down a shellac-based or bonding primer, which sticks over oil, shellac and old varnish alike.

Post-war tract stucco across the Valley and the South Bay chalks on the south and west elevations, where decades of UV break the binder down and leave loose pigment behind. Wipe a dark rag down the wall. Color on the rag means the binder is gone and anything coated over that is sitting on powder, so the wall gets washed and conditioned first. White bloom near the base of a wall is efflorescence, salts dropped by water moving through. Paint over it and you have hidden a leak.

A fresh stucco patch stays strongly alkaline while it cures, and ordinary paint over it turns gummy. Either it waits or it gets an alkali-resistant primer. Watch also for a band of failed paint and mineral crust at knee height on the irrigated side. That’s the sprinkler. LA water is hard enough that repainting the band without moving the head puts the failure back inside a year. Redwood in LA is an outdoor material, siding and exterior trim and mudsills, and bare redwood pulls brown tannin through waterborne primer, so those boards get shellac or a stain-blocking primer first.

The days you can’t paint outside

Santa Ana conditions from September into February drop humidity into single digits, and exterior latex skins over before it has leveled. You get lap marks and grit blown into the wet film. The other end of the day matters as much. A coat has to be dry before the marine layer comes back and the dew lands on it, so a shaded elevation stops in the early afternoon. October through March you want a couple of dry days behind a fresh coat, because a storm arriving twelve hours later washes streaks down the wall. Surface temperature only bites on a cold January morning on a north wall that hasn’t seen sun yet.

The federal RRP rule covers anyone paid to disturb painted surfaces in housing built before 1978, which is a large share of what’s standing here. There is a minor repair threshold of six square feet of interior painted surface per room, or twenty outside. Above that the rule applies. Window replacement and demolition are never exempt at any size, and the threshold disappears if the work involves torching, a heat gun above 1100 degrees, or machine sanding without HEPA exhaust.

Over the threshold the firm needs EPA lead-safe certification, a certified renovator has to be on the job, work gets contained, and you get handed the EPA “Renovate Right” pamphlet before anything starts. Testing out is allowed. A certified renovator with an EPA-recognized kit, or a certified inspector, can show a component isn’t lead-based, and the rule stops applying to it. California never took the program over, so EPA enforces it here.

Popcorn ceilings and pre-1980 texture

Ceiling texture, joint compound and 9x9 floor tile from before 1980 can contain asbestos. Coating a popcorn ceiling doesn’t disturb the material and doesn’t trigger the asbestos rules. Scraping, sanding or wire-brushing does, and that’s a different job with a different rule on it. SCAQMD Rule 1403 wants a survey by a California Certified Asbestos Consultant before the material is disturbed, and it follows the federal definition that leaves out residential buildings of four dwelling units or fewer. A house, a duplex or a fourplex sits outside the rule. A larger apartment or condo building doesn’t. Unit count means nothing to Cal/OSHA, though. Title 8 section 1529 covers anyone disturbing asbestos for pay in any building, and the CDPH training requirements ride along with it.

How you coat one is a separate question from any of that. A roller on a ceiling that has never been painted grabs the aggregate and pulls it down in clumps, and you finish with a worse ceiling and pre-1980 material on the drop cloths. A virgin acoustic ceiling gets sprayed, a light mist coat first so the texture has something holding it before the wet coat lands. One that has already been painted once will usually take a roller.

Painting is exempt from a building permit under the LA building code, and the County and the independent cities read the same way. That is no exemption from RRP or Rule 1403, and Title 24 has nothing to say about repainting a room or a set of doors. Alarms are the other thing that gets missed. Paint clogs the sensing chamber and voids the listing, so smoke and CO alarms come down, go in a bag, and go back up at the end. A ceiling repaint is often when somebody notices the alarm is stamped 2011.

The paint counter here isn’t the one the rest of the country shops at either. SCAQMD Rule 1113 holds architectural coatings sold in the basin to VOC limits well under the national numbers, which is why traditional solvent-borne alkyd enamel is not something you can walk out with in LA County. On old oil trim that leaves one route. Scuff-sand it, prime with a bonding or shellac-based product, then finish in a waterborne alkyd, which levels close to the old stuff and cures hard.

California has a narrow exemption that lets some minor work be done without a CSLB contractor license. It’s Business and Professions Code section 7048, and the price is only one part of it. The work has to be casual, minor or inconsequential. Labor, materials and everything else added together have to come to less than $1,000. No building permit can be required. The job can’t be one piece of a larger project, and a bigger job can’t be split into smaller contracts to fit under the number. The exemption also drops away for anyone who brings in another person to do the work or help with it, or who advertises in a way that might suggest to the public they’re a contractor.

A single room, one ceiling, a few doors and jambs, or a patch after the plumber left will usually sit under $1,000. A whole-house interior, a full exterior, a sprayed kitchen, popcorn removal, or anything staged off scaffolding is past that on labor alone, and gets matched to a licensed contractor, usually a C-33. Lead containment pushes small jobs over too. And EPA certification is a separate question from the state license. A firm disturbing paint in a pre-1978 home needs it whether the job is $400 or $40,000.

Start with the year the house was built and which city you’re in, since that decides lead, asbestos and how the prep has to be done. Then say what you want painted: walls only, walls and ceiling, trim, closet interiors, and how many doors, counting jambs and casings or not. Give the room dimensions and the ceiling height. If there’s a can of the old paint in the garage, a photo of the label beats any description of the color.

Photos help more here than on almost any other job. One wide shot per wall from the opposite corner, plus a close-up of every damaged spot with a tape measure in frame. If there’s texture or old repair work, take one along the wall with the light raking across it. Tell us whether the leak behind a water stain has been fixed, and whether a young child or a pregnant occupant lives in a pre-1978 house. Send that and you get a firm price before the visit is scheduled.