The chimney liner is the single most safety-critical component of your chimney system. It serves three essential functions: it contains the combustion gases and heat from your fireplace or heating appliance within the flue, it protects the surrounding masonry from the corrosive effects of combustion byproducts, and it provides a correctly sized passage that promotes proper draft and combustion efficiency.
Many older homes throughout Long Island -built in the 1950s, 1960s, and 1970s in communities like Levittown, Bethpage, Massapequa, Hicksville, Huntington, and Smithtown -were constructed with unlined chimneys or clay tile liners that have since cracked, offset, or deteriorated. Operating a fireplace or heating appliance connected to a compromised liner is dangerous and, in many jurisdictions, a building code violation.
Capstone Chimney & Masonry installs UL-listed stainless steel and aluminum chimney liners throughout Nassau County and Suffolk County. We carry 316L alloy liners for oil-fired systems (the most corrosion-resistant option), 304 alloy liners for wood-burning systems, and smooth-bore aluminum liners for natural gas and propane appliances. All liners are sized to the specific BTU output and flue collar diameter of the connected appliance, ensuring optimal draft and efficiency.
A properly installed liner also extends the life of the surrounding masonry. Without a liner, acidic condensation from combustion gases attacks mortar joints and brickwork from the inside, accelerating deterioration that is expensive to repair. Stainless steel liners are virtually impervious to these byproducts and, with occasional inspection, will outlast the masonry surrounding them.
Liner installation is also commonly required when converting a heating appliance -for example, switching from oil to gas, or adding a wood-burning stove to an existing flue. Code requires that the liner be correctly sized for the new appliance; an improperly sized liner from a previous installation is a common source of draft problems and appliance inefficiency.
We serve chimney liner installation customers across Long Island, including Huntington, Northport, Cold Spring Harbor, Commack, Hauppauge, Smithtown, St. James, Stony Brook, Port Jefferson, Setauket, and throughout the North Shore. In Nassau County, we regularly install liners in Garden City, Mineola, Rockville Centre, Freeport, Long Beach, Great Neck, Manhasset, Oyster Bay, Jericho, and Woodbury.
If you suspect your liner is damaged, if your heating system is more than 20 years old and has never been inspected, or if you're planning an appliance conversion, contact Capstone Chimney & Masonry at (631) 449-3086 for a camera inspection and liner consultation. Free chimney liner estimates available throughout Nassau and Suffolk County on Long Island.