This building needed to upgrade/convert the heating system. They needed to make sure the chimney was up to code and gas tight. We scheduled a site visit and could see cracks in the chimney from the top and at the base so we recommended relining. The chimney was rectangle and a 10gage lining (which is the ideal material to use for relining) would not fit we recommended a ProForm chimney lining which would allow us to use the maximum amount of space inside this narrow chimney.
We lined this structure with 90’ of UL1777 listed Pro Form flex chimney lining. This allowed us to use the maximum space inside this chimney which narrows as it goes from top to bottom. Beneath the breeching we transitioned to stainless steel and landed the lining on a steel plate. We provided the DOB required gas tight cleanout and drain. At the existing breeching we tied into the newly installed lining with a stainless steel tee connection. The chimney itself stands 5’ off the center of the main roof on the bulkhead. We erected scaffolding to access the top of the structure for the duration of the project. The chimney terminated with a stainless steel chase wrapped on all sides. The pipe protruded 3’ out the top of the chimney.
After we lined the chimney and connected it to the breeching we then performed a pressurized smoke test on the chimney lining as required by the DOB. That is done normally with a witness, usually an engineer. Once we smoke tested the chimney lining we were able to issue the chimney affidavit that the New York City Department of Buildings and Con- Ed requires.