How Much Class A Chimney Pipe Thru Roof

With offsets tallied and the roof penetration point determined you can calculate how much chimney pipe you need.

How much class a chimney pipe thru roof.

While you re still on the roof attach the storm collar to the chimney pipe. This is a bit of an odd measurement and chimney clearance case because the chimney side is actually about 8 away from the roof edge. These work better on smaller round chimneys and may be ideal for a stove chimney in a metal roof. Instead of having to cut flashing materials yourself you can buy a fitting boot for your chimney pipe.

The flashing is installed over the hole that was cut in the roof so the class a chimney pipe could pass through it. Make sure to put a bead of silicone around the storm collar where it meets the chimney pipe. Their jobs are to protect your home from the weather getting in through the hole in the roof. The 3 2 10 rule ensures code compliance and proper venting.

The roof flashing and storm collar necessary chimney components and they go hand in hand. Chimney planning step 2. Determine the number of chimney pipe lengths required the chimney must extend at least 3 feet above the highest point where it passes through the roof and be at least 2 foot higher than any part of the building within a horizontal distance of 10 feet figure 2. This article series describes b vent metal chimneys used for gas fired appliances.

The rock vent class a roof support is designed to provide support for the chimney pipe at the roof line. We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys. A different type of flashing is a chimney pipe boot. In fact you ll need two elbows if offsetting class a chimney pipe an elbow to start the offset and another one to end the offset.

The chimney pipe must protrude through the roof a minimum of 2 feet and it must be at least 10 feet away from the roof line. To guarantee you have enough pipe you must follow the 3 2 10 rule. The height of the chimney above the roof surface measured at the up slope side of the chimney from the roof surface to the chimney top should be at least three feet the green line in our photo. While many stove pipe and direct vent pipe systems use 90 degree and 45 degree elbows class a chimney pipe systems do not allow for more than a 30 degree elbow.