How to Install Metal Roofing Around a Stove Pipe?

Installing a stove pipe through a metal roof is essential for safe venting in a cabin, garage, or home. A proper installation ensures that heat, smoke, and fumes exit without causing fire hazards, leaks, or structural damage. Using the right flashing, chimney components, and roofing materials prevents water build-up, snow damage, and expansion/contraction issues caused by heat and cold fluctuations. Whether you’re installing a wood-burning stove or a pellet stove, following this step-by-step guide will ensure a secure and efficient installation.

Step 1: Gather Necessary Tools and Materials

Before beginning the installation, collect all necessary materials, tools, and components. A stove pipe kit includes a flashing boot, storm collar, rain cap, and a triple-wall pipe for proper insulation. Ensure you have high-temp silicone sealant, EPDM gaskets, and Sikaflex to seal gaps. Use 26-gauge steel, corrugated panels, and galvanized fasteners for durability. Other required items include:

• Measuring tape (1/8″ increments for precision)
• Tin snips, jigsaw, or metal shears
• Roofing screws (galvanized and stainless steel)
• Flashing with bendable flange to fit roof pitch (10/12, 8/12, 6/12)
• Adjustable clamp collar for securing the stove pipe
• Nails, perloins, decking materials, and rubberized sealant

Ensure you purchase fire-rated, Class A chimney pipes, which are designed to handle high-temperature combustion.

Step 2: Determine the Stove Pipe Location

Choosing the correct stove pipe placement is crucial for efficient heating and proper venting. The pipe should exit vertically through the roof peak or slightly below to prevent snow build-up. Consider the following:

• Avoiding rafters, trusses, and I-joists while cutting the roof hole
• Positioning the chimney pipe to match the roof slope and pitch
• Ensuring a minimum clearance of 2 inches from combustible materials such as planks, beams, and finished ceilings
• Checking manufacturer instructions for required diameter (typically 8-10 inches)

Best practices: For a vaulted or cathedral ceiling, use a support box to accommodate the pipe and maintain clearance. If your roof is shingled, remove a 12×12-inch section to create a square opening.

Step 3: Cutting the Roof Opening

Using a measuring tape, mark a square or round hole to match the stove pipe diameter. Drill a pilot hole, then use tin snips or a reciprocating saw to make precise cuts. Smooth out the edges to avoid flashing damage.

For proper cutting, follow these guidelines:

• Use a 90-degree angle for symmetry
• Ensure the cut matches the diameter of your flue pipe (typically 6″, 8″, or 12″)
• Create a watertight barrier using butyl tape and liquid flashing

Step 4: Installing the Roof Flashing

Slide the flashing boot over the stove pipe, ensuring it snugly fits against the metal roof. The top edge of the flashing should go underneath the upper metal panels, while the lower section should overlap the lower roofing panels to redirect water flow.

• Secure the flashing with galvanized screws and rubberized washers
• Apply high-temp silicone underneath for extra sealing
• Install a snow diverter if you’re in a cold climate to redirect snow away

For corrugated roofs, use accordion-style flashing to accommodate the roof ridges.

Step 5: Assembling and Installing the Stove Pipe

Start by connecting the first pipe section inside the cabin or home. Use a clamped collar to ensure a tight connection. Continue adding pipe sections until the flue reaches the roof exit point.

• Fasten each joint with stainless steel screws
• Use a gasketed clamp to secure the pipe sections
• Double-check clearances from walls, ceilings, and loft areas

If using a flexible chimney liner, ensure it runs perpendicular to the roof exit.

Step 6: Installing the Storm Collar and Rain Cap

Attach the storm collar around the stove pipe, ensuring a snug fit. Apply silicone caulk to seal the collar edges. Next, install the rain cap, which prevents rainwater entry and enhances venting efficiency.

• A high-quality rain cap prevents downdrafts
• For windy areas, use a wind-resistant cowl cap
• Apply EPDM sealant around the collar to prevent leaks

Step 7: Securing the Metal Roofing Around the Pipe

Reinstall the roofing panels, ensuring they accommodate the stove pipe opening. If necessary, cut and trim the panels to fit properly.

• Use a metal ridge cap to seal around the chimney
• Ensure fasteners are properly tightened to prevent loosening over years
• Use standing seam flashing for longer-lasting durability

Step 8: Final Sealing and Leak Prevention

After securing all components, apply additional sealant around the flashing, storm collar, and screw heads. Test the installation by pouring water around the flashing and checking for leaks inside the cabin.

Step 9: Safety Inspection and Testing

Light a small fire to test for proper smoke ventilation. Ensure the flue operates efficiently and that the stove pipe connections are airtight. Check for:

• Smoke exiting properly through the chimney
• Leaks, condensation, or heat escaping from seams
• Proper airflow and combustion efficiency

Perform routine cleaning and maintenance to prolong the lifespan of your chimney system.

A properly installed stove pipe ensures safe, efficient heating while protecting your roof from leaks and fire hazards. Regular inspections, cleaning, and maintenance keep your chimney system running smoothly for years. If unsure, consult professional installers or refer to manufacturer diagrams for additional insights.