The owners of this home in Washington DC hired our Washington DC chimney repair team to rebuild their leaning chimney in Washington DC. Above is a picture of the chimney. You can see that the chimney is leaning towards the house. This occurred because the mortar joints had deteriorated. The mortar joints had deteriorated over time from moisture getting into the chimney. It is possible that the moisture may have come from the concrete crown and worked its way down the chimney or it may also be from the condensation of the flue gasses in the chimney or both. In this particular case, I believe it’s a result of both. This project reminded me of a previous rebuild.
Here we are starting the demo and taking the chimney down. The leaning chimney could not be corrected without rebuilding it.
Once the chimney was rebuilt we installed a stainless steel liner for the fireplace and the gas boiler and water heater in the basement. We install the liners after the brickwork, so they are not in the way while we are laying the bricks. During the demolition of the chimney, we removed the old terracotta flue liners to make room for the stainless steel liners.
Once the liners were installed, we insulated around the liners with a minimum 1″ of Premier Mix poured insulation which is a mixture of vermiculite and Portland cement. This plus 4″ of solid masonry is required for the liners to meet the manufacturers UL Listing for zero clearance.
In the basement, we installed two stainless steel tees inside the wall for the water heater and gas boiler to hook up to.
We parged the smoke chamber of the fireplace with Chamber Tech 2000 to seal any gaps and to correct the corbelling bricks.
Once the liners were installed, we completed the rebuild by pouring a new floating cast concrete crown and installing new copper counter flashing that is tucked into the mortar bed joints of the chimney. The chimney will be painted at a later date along with the rest of the house.
The chimney has been completely rebuilt including the liner, crown, and caps.