The Plaster Bagworm, is another kind of case-making moth and may also feed on fabrics like its cousin the Case-making Clothes Moth. However, more commonly they may be found feeding on various bits of detritus and debris found around the home, such as dead insects in window sills, spider webs, and other organic matter. Occasionally they may be found in large numbers feeding on the fungus that grows on wood, and perhaps could be a sign in the structure of water leaks or excessive moisture accumulating on wood.

The larvae also create their silk case to live in, carrying it around with them, and as active larvae may be found resting on a wall or furniture. The case is similar to that of the case-making clothes moth, but the ends seem to be more tightly pinched and there often are tiny grains of sand or dirt incorporated into the case along with the silk.

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