Braced Chimney
Source: Noson, Perbix, SSD
To secure chimneys.Caution

Chimneys that extend above the roof more than twice the least dimension of the chimney tend to crack just above the roof line.Chimneys may then fall through the roof or onto walkways below creating a life-safety hazard.


Source: Noson, Perbix, SSD
Consult a structural engineer to implement one or more of the following options:

  • Remove chimney.
  • Reduce chimney height to no more than twice the smallest chimney dimension.
  • Brace the chimney.
  • Fill the chimney with concrete.
  • Install plywood reinforcing on the roof to prevent chimney bricks from falling through the roof to the rooms below.
  • Tuckpoint deteriorated mortar in the chimney.


  • The mechanical code requires specific heights and locations for the type of chimney used. These code requirements must be considered before selecting any of the options to secure the chimney.
  • Exterior walls may require additional strengthening if the wall supports a chimney and large windows.