Proper Clearance Between Chimney And Roof

If you ve been researching class a chimney pipes you ve probably heard of the 3 2 10 foot rule numerous times.

Proper clearance between chimney and roof.

If you choose the latter method ensure the chimney pipe maintains proper clearances. Chimneys should extend upwards. And a rain cap protects the inside of the flue. This guideline is the same for exposed naked chimney s as it is for enclosed chimney s in a chase.

The 10 2 rule is the guideline for determining the amount of chimney required for proper operation and draw of your wood burning fireplace or stove. The sketch at left shows the proper minimum chimney height and roof clearances for a masonry chimney. What is the 2 foot 10 foot 3 foot rule. Nail the flashing in place right after you put down the tar paper or weather membrane.

The plan on the left shows a code compliant chimney through floor or roof framing with a 2 air space between the masonry chimney walls and the combustible framing. A clearance gap of inches is required between a manufactured chimney and combustibles. The proper name for the connection between a manufactured chimney flue and the. The difference between a chimney cap and.

The chimney must extend at least 3 above the highest point where it passes through a roof. Open valleys have metal flashing to protect this critical area of the roof. Type b vents ceiling floor wall clearances b vent clearances to combustibles clearance distances for a b vent to combustible materials in floors walls ceilings attics roofs. Masonry chimney clearances ibc code change proposals s232 12 and s237 12 by jim buckley chair.

We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys. A rain cap or deflector is required on all manufactured chimneys. This rule refers to the proper height of the chimney pipe above the roof. Determine proper chimney height using the 10 2 rule.

One of the most important aspects of the planning process is installing the proper amount of chimney pipe above the roof. Positing a chimney on the home relative to the rest of the home may cause it to draw better. Masonry chimneys must terminate. This article series describes b vent metal chimneys used for gas fired appliances.

Any portion of a masonry chimney located in the interior of the building or within the exterior wall of the building shall have a minimumair space clearance to combustibles of 2 inches 51 mm. At least 3 feet above the highest point of contact with the roof structure the vertical green arrow in our sketch at left and. This guideline has 3 main. Masonry chimney roof clearance requirements.

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately.