Household Casebearer Moth, Clothes Moth

This bug we find on our siding every spring and summer. How do we exterminate this bug? Is it an infesting type, or do we like it for eating the spider webs? With it getting into our house occasionally, do we have to worry? We live in Edmonton, Alberta, Canada. I am wondering how these pests survive the winter?

This tiny little bug moves around with this "bag" around him made of silken fiber and sand particles, lint, paint fragments, and other debris. The case has a slit-like opening at each end, and the larva is able to move around and feed from either end. Plaster bagworms are similar in appearance and closely related to clothes moths. The bag resembles a flattened, gray, watermelon seed-shaped case about 1/4 - 1/2 an inch long. The Plaster bagworm is also knows at the Household Casebearer or the Concrete Bag Worm because the bag looks like a speck of splattered concrete or plaster. They usually cause little if any damage, feeding primarily on old spider webs.