Crystal Air Duct Solutions blog

Why You Should Sweep Your Chimney Before Winter

Creosote, nests and blockages to clear before the first fire of the season.

Short answer

Sweep your chimney before winter to remove creosote, which can catch fire, and to clear nests and debris that block the flue. A fall sweep and inspection also checks the damper and chimney cap before you light the first fire.

Published 2026-09-14 · By the Crystal Air Duct Solutions team

Creosote

Every fire leaves creosote on the flue walls. A thick layer can ignite, so a yearly sweep keeps it in check.

Nests and blockages

Birds and animals nest in uncapped chimneys over summer. A cap with a spark screen keeps them out and helps stop embers from escaping.

Signs you need a sweep

Smoky smell indoors
Poor draft or smoke coming back into the room
Black flakes in the firebox
Animal sounds in the chimney

Written by the team at Crystal Air Duct Solutions, an owner-operated duct and dryer vent company in Malibu, CA. Our owner has more than 20 years of experience.