Styrofoam ceiling beams are a type of faux wood beam used to decorate otherwise plain ceilings, according to the Home Guides by San Francisco Gate. While these beams provide no load-bearing benefits, they are inexpensive, lightweight, and relatively easy to install.
Styrofoam ceiling beams often use lightweight wood planks as a core, with shaped styrofoam wrapped around three long sides; in other cases, the shaped styrofoam has no core. The styrofoam is molded to resemble rough-hewn or smooth wood, then painted. These faux beams are installed using construction-strength glues and screws, hand-cut and hand-fitted to each individual ceiling. Depending on the type of faux beam purchased, they may be installed flush with the ceiling or suspended. By themselves, faux beams are never load-bearing beams; they must be modified to support chandeliers or other secondary fixtures.