Why Do Interior Walls Crack in Temecula Homes Before Painting

A hairline crack above a door and a crack that runs the height of a corner can look like cousins, yet the first is cosmetic and the second keeps opening, a pattern the notes at temecula interior painting stevie rep describe in older Temecula, CA homes. Interior painting in the Temecula Valley often starts with finding out which kind of crack is on the wall.

Why walls crack here

Houses built on valley soil settle unevenly over the years, and the swing between hot days and cool nights moves framing a little. Drywall tape joints, door corners and the line where a wall meets the ceiling are the weak points. Newer tracts near the Santa Margarita River and older homes closer to Murrieta Creek show the same cracks for the same reason: the frame moved, and the rigid paint film did not.

Caulk or joint compound

A crack that moves needs caulk, because paintable acrylic caulk stretches. A crack that has stopped moving is filled with joint compound or spackle, which sands smooth. The mistake is filling a moving crack with hard compound, which reopens within a season. Painters check by pressing on both sides of the crack and watching for movement.

Feathering a patch

A patch should disappear into the wall, which means the compound is spread wide and thin, well past the crack on each side. Sanding with fine sandpaper on a block tapers the edge until a hand run across it finds no ridge. Textured walls need the texture matched with a stipple brush or spray can before paint.

Spot priming

Joint compound is porous and soaks up paint differently from the wall around it, so a patched spot shows through the topcoat as a dull flat patch, a defect painters call flashing. A coat of primer over each patch seals it. In a bright room with large windows, the spot shows under sunlight even if it looked fine under work lights, so the patched wall is checked with a raking light before color goes on.

Cracks that return

A crack that reopens after patching points to continuing movement, and a larger repair may be needed before repainting. Cracks wider than a pencil line, cracks with offset edges and cracks that run from a window corner toward the floor are worth a closer look than a paint job alone gives them. For ordinary hairline cracks, flexible caulk, patient sanding and a primed patch under two coats of paint hold up well.

The patch is the part of the job nobody sees afterward, which is the point of doing it carefully.