Use a flexi metal connector to take up any misalignment.
Flue installation through tiled roof.
The flue must rise high enough to create a 2 3m horizontal clearance between the top of the last length of pipe and the surface of the roof.
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Position the vent pipe up to the bottom of the roof.
With the pipe in a vertical position trace around the pipe using a pencil.
This flashing is used to provide a weatherproof seal where the flue passes through a tiled or slate roof.
Use reducer adaptors for varing pipe diameters.
This is the conclusion of the 2nd of a 2 part video series showing the installation of a kitchen vent flashing.
Most installers or roofing contractors will use a slate piece or a metal or lead piece that fits onto a flat or pitched roof with a gromit where the flue pipe goes through.
Go into your attic.
For an internal twin wall system rising up through the roof surface you must consider all four of the following building regulation requirements.
This is normal but the most important thing to remember here is that it won t seal if you do this while it s raining especially on a flat roof.
Check the joint between the roof terminal and flashing is watertight and secure the roof wall clamp.
Firstly you ll want to know your chosen engineer is fully competent and experienced at fitting flues through roofs.
The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof.
Take it up through the soffit remove a roof tile and use a tile slate pipe flashing to exit pipe through and seal.
You may need an experienced roofing contractor.
Google roof pipe flashings for products and install info.
It is the responsibility of the installer to ensure that the flue installation through the roof is weatherproof i e no rain must ingress into dwelling roof space.