Chimney Sweeping & Repair in Londonderry, NH

Winters are long: the Manchester Ap station averages 129 nights a year at or below 32°F and 52 at or below 20°F.^1,2 In long winters, chimneys work hard and masonry sees many freeze-thaw cycles; annual inspection and a sound cap and crown are the maintenance baseline. The median home in the town of Londonderry was built in 1986, newer than the U.S. median of 1980 and newer than the New Hampshire median of 1979.³ Londonderry's housing is newer than the national mix: 38% of units predate 1980 against 50% nationally, and 16% date from 2010 or later.³

Rainfall is substantial: about 40 inches a year, 8 days of it an inch or more.^1,2 Heavy rain tests the flashing and crown; most chimney leaks enter there rather than through the brick, and the inspection report should say which. Snowfall averages about 67 inches a year.^1,2 Snow sitting against the stack keeps masonry wet for weeks; a cap, a sound crown and sealed counterflashing are what keep it out.

Heating dominates the year: about 6,172 heating degree days against 773 cooling degree days (base 65°F).^1,2 In a heating-led climate, insulation and air sealing carry most of the energy-code weight for any work that opens the envelope. Building permits in Londonderry are normally issued by the town or township office.^4,5 Permits for a rebuild or liner, where required, go through the town or township office.