Roof ridge vents are fitted along the peak of your roof, replacing single ridge tiles. They harmonize nicely with the style of your roof and siding. Though it is true that it is simpler to install a ridge vent before shingling, it is possible to retrofit one onto an already shingled roof.
Step 1 – Be Prepared
Make sure the ladder you are using is secure at the top and the bottom. Be cautious around power or any other wires. Make sure the weather is cooperative; you don’t want it to be a wet or cold day. Don’t start when the morning dew is still on the roof. Wear rubber-soled, non-skid tread shoes so that you don’t slip while on your roof. Lastly, keep a bucket or special area of the roof for loose nails and other things you need to discard. That way, you won’t step on them and fall.
Step 2 – Measure Your Insulation
Because installing a ridge vent without first attaining proper attic insulation is not recommended, measure the thickness of your attic floor insulation. If the attic is finished, measure the wall and ceiling insulation. Then, check with your hardware supplier to ascertain whether or not you need to add more.
Step 3 – Make Room
Tear off your roofing or cut back shingles. Be careful to only remove the amount recommended by the vent manufacturer, which is generally 6 inches from the end of your ridge or a foot from the chimney. Use a utility knife to cut away the felt paper. Pull out any staples and roofing nails.
Step 4 – Put Down Chalk Lines
Snap a chalk line on either side of the ridge. The vent instructions included by the manufacturer will indicate how far from the peak the line should be. Generally, it’ll be 1 to 1.5 inches away on both sides.
Step 5 – Cut
Use your circular saw to cut the sheathing. Be sure not to cut the rafters. Cease cutting about 12 inches from the end of the ridge, or use the manufacturer recommended measurements. Finish the cut with your hammer and chisel.
Step 6 – Put in Roofing
Add roofing up to your cut vent hole. The venting may come in two forms: in pieces or in a continuous strip. If it is a continuous strip, cut it into 2 and work from each end toward the middle. Keep the pieces stretched taut so that they aren’t in danger of sagging.
Step 7 – Nail
There are nail holes provided (about every 12 inches). Put in the nails, making sure they enter the sheathing as well.
Step 8 – Cut Away the Underside
Cut the underside of this sort of vent so that it seals at the end. Other kinds of vents have rake vent caps. Just be sure that yours is sealing against the roof on either side.
Step 9 – Cut Ridge Caps
Cut ridge caps as you would for any roof. Put each into place so that it wraps the ridge vent. Use a 5 inch reveal on the ridge caps.
Step 10 – Nail
Use long roofing nails, such as 2 inch nails, to completely enter the sheathing. Make sure you put them in so that they are flush and not indented.