This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
How to install a roof vent.
To install a roof vent start by installing air vents along the edges of your attic which will allow the moisture to escape from your home.
Your roofer will build this frame just a little larger than size of the vent leaving 1 8 inch of extra room on each side.
Locate the drill bit.
Next position your ladder against your home and climb up to your roof.
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Installation first requires a wood frame made of 2x4s installed from the attic between two studs.
This video details how to install roof vents in a r.
First head up to your attic and determine where you want to install your roof vent.
Drill a hole upward through the middle of the area you desire and leave the drill bit sticking up through the roof so you can find it from the outside.