Demolish existing chimney to the roofline. Rebuild from that point upward in reinforced masonry, per DCLU standard details, and dowel new rebar into existing chimney a minimum of 12 inches. Tie reinforced portion to the building at the roofline, and provide an engineered external brace in the upper portion of the chimney. Add a UL listed metal chimney transition assembly and a factory built metal chimney above. Tie the metal chimney at the roof level and brace the upper portion back to the roof for extensions per the manufacturer s recommendations.
Private engineer designs all reinforcement and connections to the building.
Call for final inspection when work is complete. DCLU recognizes that previous policies may not have required this type of repair in the City of Seattle. However, these policies are less restrictive than rules other jurisdictions have put in place after earthquakes. If a decision is made to remove or cap the chimney, verify first that it is not needed for venting other appliances. Standard Chimney Repair Details Below are links to standard chimney repair details approved by DCLU that may work for your chimney.