A single wall pipe will require 18 inch clearance to the ceiling while double wall pipe needs an 8 inch clearance to the ceiling.
How to put correct pipe pipe roof.
Start from the top of the roof and remove the old shingles along with the flashing underlayment and vents.
You will need to cut the opening to the roof to extend the chimney pipe.
Cut and use template to mark and cut sheet to fit pipe at 45 angle.
To find pipe end shape not hole in sheet enter 0 for sheet thick.
Water and waste head down the pipe while gasses are vented up and outwards.
Apply roofing cement around the pipe and underlayment as it penetrates the roof to create a weather tight seal.
When calculating your chimney pipe size subtract 1 5 inches for each joint overlap.
Also remove and discard the existing pipe flashing and any old roof cement.
Hammer down any large nails that are exposed by the removal.
The stack also allows fresh air in to keep water running smoothly through your piping.
A double wall pipe needs a 12 inch clearance space.
The stack pipe leads the whole way out through your roof and further underground in the opposite direction to main sewer lines.
Prepare the roof vent pipe by removing up to three courses of shingles above the existing pipe flashing to ensure that the back flange is covered by the shingles.
No sales pitch or other fluff.
Go into your attic.
The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof.
Inspect the underlying roof sheathing for damage and make any needed repairs.
See our full range of installation.
With the pipe in a vertical position trace around the pipe using a pencil.
Select angle increment and hit full set to generate and print a full set of oval templates for currently entered pipe diameter.
