Where there's smoke: 4 myths about chimneys

A wood-burning fireplace is the most inviting way to heat. Reduce the risk of chimney problems by installing a chimney cap to keep out rain, animals, and debris, and beware of these maintenance misconceptions:

MythUnused chimneys don't need inspecting.
RealityCracks can develop and weaken the structure, and obstructions like bird nests can build up. An annual inspection allows you to fix small problems before they become big.

MythFocus on structural issues.
RealityBlockages or a buildup of creosote can cause fires and carbon-monoxide poisoning. Dirty chimneys cause most chimney and flue fires, according to the National Fire Protection Association.

MythExpect to pay $40 for a basic inspection and cleaning.
RealityFraud alert! Once in your home, a cheap sweep is likely to say there's damage that will cost thousands to fix. A basic inspection and sweeping usually costs $150 to $300, the nonprofit Chimney Safety Institute of America says.

MythSome good sweeps take 10 minutes.
RealityEven a basic, level-1 inspection and sweeping takes 60 to 90 minutes. The sweep should ask about past problems. He'll turn off fuel-burning appliances that vent into any of the chimney's flues and will place drop cloths in the work area. He'll inspect the chimney and flashing. He'll clean the chimney and tidy the firebox, noting problems. A level-2 inspection, $225 to $450 and 90 to 120 minutes, is apt when the chimney has been structurally changed. Level 3 could be costlier and might even involve demolition.

Find a certified sweep at www.csia.org and check www.bbb.org for complaints.