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Planning a new chimney liner

Local specialists and upfront prices on every relining in Longwood, backed by our 100% satisfaction guarantee.

When the flue is too large

An oversized flue gives exhaust more room than it needs, so it moves slowly and cools on the way up. One liner maker's instructions link incorrect sizing to condensation, creosote build-up and poor draft.

Relining with a liner sized to the appliance restores a passage in proportion to the exhaust. We explain the current flue size, the size the appliance calls for and the difference a new liner would make before you decide. For a gas appliance, the same mismatch tends to show up as moisture, so the liner size is checked against the appliance instructions rather than the old flue.

Offsets and changes in direction

An offset shifts the flue to one side between the fireplace and the roof. The building code limits offsets in masonry chimneys, and at the bend the usable space inside the flue is smaller than at the top or bottom.

We check offsets during the route test and choose a liner that can make the turn without losing its shape. When an offset is too tight for the size the appliance needs, we explain the alternatives before any work is booked. The route test result is shared with you, so the reason for the chosen size is clear.

Liners for gas appliances

Gas appliance venting is sized under NFPA 54 and the appliance maker's instructions. Burning gas produces water vapor, so a liner that is too large or too cold can collect condensation.

Some gas appliance listings allow aluminum liners, while others call for stainless steel. We follow the specific appliance's instructions, and when those instructions call for a model-specific vent kit, we explain that instead of offering a generic liner. The appliance model and its vent instructions are confirmed on site before any liner for a gas appliance is priced.

Measuring the liner length

The liner has to reach from the appliance connection to the top of the chimney with a little extra for trimming. One maker's instructions measure from the bottom of the opening to the top and add about six inches.

We measure on site rather than estimating from the outside, since offsets and the connection point change the length. An accurate length keeps extra joints out of the flue and keeps the price stable. The measured length is written in the estimate next to the liner size.