Always install flashing around a chimney and other valleys where two roof planes meet as these areas are more prone to leaks if not protected.
How to install a roof vent shingles.
Remove the shingle caps.
To install the vent the roofer slips the flange the metal lip of the vent under shingles at the upper part of the hole and rests the flange on top of the shingles at the down slope part of the hole.
Go into your attic.
This is an area of the roof which requires extra care and skill.
For most asphalt shingle ridge caps there are two.
Cut the ventilation opening.
Check around the edges of your attic for any wiring.
There are a number of key steps you need to take to avoid mucking this part up.
Install new field shingles.
Drive a nail through your attic to mark where you want your vent.
When laying shingles work from the bottom to the top of the roof.
Start by removing the nails holding the ridge cap shingles in place.
Install the ridge vent shingle over style install the ridge vent aluminum.
Slide the top and sides of your vent underneath the surrounding shingles and leave the bottom side of the vent exposed and laying over the shingles.
Installing soffit intake vents.
How to install a roof vent method 1 of 3.
Next hammer in a nail every few inches to secure the vent to your roofing structure.