Not recommended for DIY due to specialized skills, inherent safety risks (fire, carbon monoxide), and strict code compliance requirements. Professional installation is strongly advised.
Chimney liner installation requires precise sizing calculations based on appliance BTUs and chimney dimensions, specialized materials for specific fuel types (gas, oil, solid fuel), maintenance of critical clearances to combustibles, and ensuring proper draft and exhaust of combustion byproducts. Failure to comply can lead to fire hazards, carbon monoxide poisoning, and appliance malfunction, necessitating professional expertise in DuPage County's varied housing stock.
Project Guidelines & Rules
General Requirements & Permits
4 Rules
Permit Requirement
A building permit is required for all chimney liner installations to ensure compliance with local codes and safety standards. (Refer to your local municipality's building department for specific permit application procedures and fees).
Qualified Personnel
Installation, repair, or replacement of chimney liners shall be performed by qualified and licensed contractors or individuals competent in chimney and venting systems, or under direct supervision of such professionals. (IRC R104.1)
Manufacturer's Instructions
All components and systems, including the chimney liner, connector, and associated parts, shall be installed strictly in accordance with the manufacturer's installation instructions and listing. (IRC R104.1, G2407.1)
Applicable Codes
This playbook is based on the 2024 International Residential Code (IRC), 2023 National Electrical Code (NEC) for any electrical components, and the Illinois Plumbing Code (which references the International Fuel Gas Code for venting) as adopted by DuPage County.
Material Standards
4 Rules
Liner Material Suitability
Chimney liners shall be listed and labeled for the specific appliance and fuel type they serve (e.g., gas, oil, solid fuel). Compatibility with the appliance's flue gas temperatures and chemical composition is critical. (IRC R1001.11, G2427.10.1)
Metal Liner Specifications
Metal liners for gas appliances shall be of stainless steel, aluminum, or other approved corrosion-resistant material suitable for the flue gases. Stainless steel (e.g., 316L for natural gas/propane, AL29-4C for high-efficiency condensing appliances) is commonly used. (IRC G2427.10.1.1, UL 1777 or equivalent for relining)
Thermal Protection
Existing chimneys relined with metal or other approved materials shall be provided with thermal protection (insulation) where required to prevent excessive surface temperatures on adjacent combustibles and to maintain flue gas temperatures for optimal draft, especially in DuPage County's climate. (IRC R1001.11.1, G2427.10.1.1)
Existing Masonry Chimneys
Existing masonry chimneys serving appliances shall be relined in accordance with UL 1777, UL 641, or other approved standards if they are deteriorated or inadequate for the appliance being served, or if converting to a different fuel type. (IRC R1001.12, G2427.10.1)
Installation Standards
6 Rules
Liner Sizing
The cross-sectional area of the chimney liner shall be sized in accordance with the appliance manufacturer's instructions and the tables/methods specified in IRC Chapter 24 (Fuel Gas) for gas appliances, ensuring adequate draft and prevention of condensation. (IRC R1001.11.2, G2427.5, G2427.10.1.2)
Chimney Termination Height
The chimney shall extend at least 3 feet above the point where it passes through the roof and at least 2 feet higher than any portion of a building within 10 feet horizontally. (IRC R1001.3)
Liner Joints & Sealing
Joints in flexible metal liners shall be smoke-tight and secured with approved methods. Rigid liners shall have tight-fitting, corrosion-resistant joints, sealed with an approved high-temperature sealant compatible with the liner material. (IRC R1001.11, G2427.6.2)
Insulation for Performance
Liners in exterior chimneys or those subject to significant heat loss, common in DuPage County's cold climate, shall be insulated to prevent condensation, improve draft, reduce creosote buildup (for solid fuel), and protect the chimney structure. (IRC G2427.10.1.1, UL 1777)
Condensate Drainage
Where a chimney liner is used with a condensing appliance (e.g., high-efficiency furnaces), a means for collecting and safely draining the acidic condensate shall be provided and properly routed to an approved drainage system. (IRC G2427.10.1.1)
Chimney Cap & Flashing
A corrosion-resistant chimney cap, designed to prevent rain, snow, and animal entry while allowing proper exhaust, shall be installed at the top of the chimney flue. Flashing shall be watertight and properly integrated with roofing materials. (IRC R1001.3, R905.2.8.2)
Venting & Appliance Connection
4 Rules
Appliance Connector Requirements
Chimney connectors for appliances shall be of approved materials, correctly sized, and installed with proper pitch to the liner. Connectors shall not pass through any floor or ceiling, nor through any fire-resistance-rated wall or enclosure. (IRC G2427.6.1, G2427.6.5)
Multiple Appliance Venting
Where multiple appliances are connected to a single common liner, the common vent system shall be appropriately sized for the total input rating of all connected appliances, and connectors must enter at different levels to prevent blockage. (IRC G2427.6.2)
Combustion Air
Adequate combustion air shall be provided for all fuel-burning appliances connected to the chimney liner, in accordance with IRC Chapter 24 (Fuel Gas) Section G2407, to ensure safe and efficient operation. (IRC G2407.1)
Carbon Monoxide Detectors
Approved carbon monoxide alarms shall be installed in existing dwellings where fuel-fired appliances are installed or chimneys are present, as required by DuPage County ordinances. (IRC R315.2)
Clearances & Fire Safety
3 Rules
Chimney Connector Clearances
Chimney connectors shall be installed with minimum clearances to combustible materials in accordance with their listing or IRC Table G2427.6(1) for specific connector types. (IRC G2427.6.3)
Chimney Clearance to Combustibles
Masonry chimneys shall maintain a minimum of 2 inches (51 mm) clearance to combustibles. Exception: This clearance may be reduced or eliminated for masonry chimneys equipped with a listed chimney lining system in accordance with UL 1777 that provides equivalent thermal protection. (IRC R1001.13, R1001.11.1)
Firestopping
All spaces between the chimney and floors or ceilings shall be firestopped with noncombustible materials to prevent the passage of flame and smoke. (IRC R1001.13.1)
Inspection & Testing
3 Rules
Required Inspections
The local building department requires inspections, typically including a rough-in (pre-connection) inspection of the installed liner and a final inspection of the completed appliance and venting system. (IRC R109.1, check with your local municipality for specific requirements).
Draft and Leakage Testing
Upon completion, the installed system shall be tested to ensure proper draft, complete evacuation of combustion byproducts, and absence of leaks. A smoke test or pressure test may be required depending on the liner type and local official discretion. (IRC G2427.1, G2427.10.1.1)
Carbon Monoxide Safety Check
The operational integrity of the entire appliance and venting system shall be verified for proper combustion and absence of carbon monoxide leakage into the occupied space using appropriate detection equipment. (IRC G2407.1, good practice)
