This video details how to install roof vents in a r.
How to install a 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.
Next find a spot on the roof for your exhaust vent draw a square outline the same size as your vent and remove the shingles from that area.
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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.
First off i m not a professional roofer this is for the diy jack of all trades guys and gals out there.
Next position your ladder against your home and climb up to your roof.
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.
Installation first requires a wood frame made of 2x4s installed from the attic between two studs.
This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.