Install a Ridge Vent

Snap a chalk line along the center of the ridge peak.

Read your product instructions for cutting the correct size slots for your roof support system (roofs are constructed with or without a ridge board). Snap parallel lines on both sides of the peak, based on whether or not your roof has a ridge board. In general, measure 3/4 to 1 inch from the centerline if you do not have a ridge board, 7/8 to 1 3/4 inches if you do.

Mark the end of the slot 6 inches from the inside of each end wall.

With a utility knife, cut out the shingles within this marked area and remove the scrap. You're now ready to cut through the wood sheathing.

Remove the debris from the slot. You're now ready to install the ridge vents.

Center the vent using the alignment guides. For the best appearance, align the ridge vent end flush with the end of the house.

Pre-fasten the first section with 2-inch roofing nails through the pre-drilled sections.

Attach the remaining sections.

Using a utility knife, cut the last section to the proper length.

Insert an end plug and secure the final section. It should be flush with the end of the house.

Cut the cap shingles and nail into place using 2-inch roofing nails.

Cut the end of the vent to fit flush with the end of the ridge vent. Be sure to insert the end plug.

Align the joined ridge vent sections over the slot cut in the ridge peak.

Fasten them in place with 2-inch roofing nails.

Place straps over the joints, and fasten them into place with roofing nails.