How often should you sweep your chimney for insurance?

Insurers care about chimneys for two reasons: fire risk inside the flue and water entry where the chimney meets the roof.

The fire side

Wood burning leaves creosote in the flue, and heavy buildup can ignite. A chimney fire that damages the house is generally handled as a fire loss, but the cracked flue liner, damaged crown, or failing masonry behind it may be treated as wear and maintenance. Some insurers ask whether you have a wood stove or fireplace insert and may want proof of a professional installation or inspection. A yearly inspection by a certified sweep, with cleaning when needed, is the standard to follow; heavy use and smoldering fires call for cleaning more often.

The water side

Many chimney leaks are not chimney problems at all. They come from step and counter flashing, a cracked crown, a missing cap, or a chimney wider than 30 inches that lacks a cricket to divert water, which building codes call for on new work. Flashing that simply wore out is maintenance and not covered; flashing torn loose by wind or a falling limb usually is.

Keep records

• Save receipts and inspection reports from each sweep
• Photograph the crown, cap, and flashing once a year
• Fix small mortar and flashing issues before they become interior water damage

Those records help if an adjuster later questions whether damage was sudden or long-term. See how adjusters separate wear from storm damage and interior water damage coverage. Robust Roofing's guide to chimney flashing leaks covers the roof side in detail.