Make a template using cardboard that s the width of your overhang with a hole the size of the vent cut in it.
How to fit a roof tile vent.
Trim the tiles so that the vent fits neatly into the hole.
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Next using your drill bit as your center use your ruler and a marking pencil to measure the same size space onto your roof.
The size of the rectangle will depend on the size of the vents but.
Use a tall ladder to reach a taller overhang.
Have a partner hold the ladder steady so you can work safely.
Step 3 add the vent once the tiles have been cut install the outside piece of the vent.
Make sure the strap is attached to the batten so that it is approximately in the centre of the flashing.
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Secure the flashing by drilling one end of the strap that comes with the roof vent to the roof batten under the flashing.
Bend the strap up and over the lip of the roof vent.
Using your ruler measure the open area of the vent the part that will sit flush with your roof.