Painting Foam Trim Bands on Stucco Homes

Foam trim never gets sanded hard. The running record temecula exterior painters ptag online holds shows that the pop-out bands around windows on stucco homes built in the 2000s in Temecula, CA fail from chalking and dings, so exterior painting of them is mostly washing, priming and careful brush work.

What the band is made of

A foam band is an expanded foam core wrapped in a thin cementitious coat that matches the stucco. It is light, it is quick to install, and the coat is only a fraction of an inch thick. Strong inland sun chalks the surface, and the first knock from a ladder or a landscaper's mower shows the white core.

Washing and chalk

Chalk wipes off on a dark rag. The bands are washed with low pressure water and a mild cleaner, rinsed and left to dry a full day. Pressure washing at close range blows the coat off the corners, so the wand stays back and the nozzle stays wide.

Patching dings

Dings are filled with a lightweight patching compound pressed in with a putty knife and feathered flat. Sanding is light, a scuff sand with a fine sponge, because the shell is thin and a heavy hand goes straight through to the foam. Deep gouges take a coat of acrylic bonding primer before the compound goes in.

Caulk lines where band meets wall

The line where a band meets the stucco opens as the two materials expand at different rates. Old caulk is cut out with a utility knife and replaced with a paintable acrylic latex caulk, tooled with a damp finger. Without the seal, rain gets behind the band and the foam core swells.

Primer and topcoat

A stain blocking acrylic primer goes on first, since cementitious coats are alkaline and soak up the first coat. Then two coats of flat or low sheen acrylic topcoat, cut in with a brush along the window frame and rolled with a short nap on the faces. Flat hides the uneven texture and matches stucco best, while a higher sheen on a band shows every ripple.

Colour and heat

Dark colours on foam run hot through a Riverside County summer, and the surface can move enough to crack a caulk line. Bands are often painted a shade lighter than the wall for that reason, and a mid tone keeps the surface cooler on the western elevation.