Chimney sweeping and cleaning in Littleton.

1. What the brush takes out.

   Smoke leaves a film on the flue wall as it cools on the way up. At first the film is dry, flaky soot; with cool, slow fires it turns into a crusty tar, and left long enough it hardens into a glaze that a brush barely moves.

   A sweep brushes that deposit from the flue wall, the smoke shelf over the damper and the floor of the firebox, and removes it entirely instead of leaving it to feed the next fire.

   

2. How often, measured in inches.

   How much you burn sets the schedule more than the calendar does. The Chimney Safety Institute of America’s rule of thumb is to sweep when the deposit is 1/8 inch thick, and sooner if it looks glazed.

   NFPA wants a yearly inspection, and that visit is when the thickness gets measured, which is why sweeping and inspecting so often share an appointment.

   In the Census Bureau’s 2020 to 2024 survey the estimate for Littleton homes heated mainly with wood is zero, so most local fireplaces are lit now and then. A few fires a winter can still leave a deposit; the yearly look is what shows it.

3. A clean flue, and why it matters.

   Creosote burns, and that is what makes it dangerous: a chimney fire starts when the deposit catches inside a flue built for smoke, not flame. With the deposit gone, a stray spark finds nothing to burn.

   A clean flue also draws better, so smoke goes up and out of the house instead of backing into the room when you open the damper or light the fire.

   

4. Stoves and inserts.

   Turn a stove down for a long, slow burn and the smoke runs cool, which is when creosote forms fastest. It collects first in the connector pipe between the stove and the chimney.

   When a stove is cleaned we go over the connector and its joints, the flue or liner above, and the cap, so the whole path the smoke takes is clear.

5. The top of the stack.

   By the time smoke reaches the cap it is as cool as it will get, and that is where soot clings. Mesh that has filled in chokes the draft, yet it is also what holds back embers, so the top of the stack is cleaned with the rest.

   

6. A smoky smell in summer.

   The odor is creosote. A used flue always holds some, but warm, humid air and a downdraft carry it into the room. Sweeping removes the source, and a damper that seals plus a cap keep the remainder where it belongs.

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