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.
How much class a chimney pipe thru roof.
The flashing is installed over the hole that was cut in the roof so the class a chimney pipe could pass through it.
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.
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.
We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys.
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 is a bit of an odd measurement and chimney clearance case because the chimney side is actually about 8 away from the roof edge.
Instead of having to cut flashing materials yourself you can buy a fitting boot for your chimney pipe.
A different type of flashing is a chimney pipe boot.
Chimney planning step 2.
To guarantee you have enough pipe you must follow the 3 2 10 rule.
Make sure to put a bead of silicone around the storm collar where it meets the chimney pipe.
The roof flashing and storm collar necessary chimney components and they go hand in hand.
This article series describes b vent metal chimneys used for gas fired appliances.
These work better on smaller round chimneys and may be ideal for a stove chimney in a metal roof.
Easily adjusts to any roof pitch and fits pipe diameters of 5 to 8 10 and 12.
Transitioning from single wall black stove pipe to insulated double wall class.
The 3 2 10 rule ensures code compliance and proper venting.
While you re still on the roof attach the storm collar to the chimney pipe.
With offsets tallied and the roof penetration point determined you can calculate how much chimney pipe you need.
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.
