How to Cut a Hole for Your Roof Air Vent

What You'll Need
Roof air vent
Duct tape
Roof tile tar

Cutting a hole to fit a roof air vent does not have to be a very complicated process. If you have any doubts about cutting a hole in your roof you can always have experienced roofers fit the vent for you, but most people with a small amount of home improvement knowledge can complete it to a suitable standard. Whether you are a hardened home improvement fan, or a beginner in DIY, fitting a vent can be done in a day if you follow a few simple guidelines.

Step 1 - Cutting a Hole

Before you begin cutting your hole, you will need to mark out the area where you intend your vent to go. If you are fitting a gable end vent, for example, this is much simpler than fitting a large air vent into the middle of your roof. Putting your vent into the middle of the roof requires that you remove any tiles or slate that may be damaged when you make the hole. Keep these pieces safe for use later. Once the roof has its shingles removed you can begin cutting. Remove any drywall from the inside, and then cut through to the outside of the roof. Be careful not to damage any foundation beams, supports, or other essential columns.

Step 2 - Fitting the Air Vent

Place the air vent into the hole and then screw it tightly into position. The hole should be just large enough to accommodate the vent, but not much bigger. When the air vent is screwed into place, you can place caulk around the edge of the frame and then seal over the inside with tape, such as duct tape. This should be pressed hard into the wall, so that the tape and caulk are secure. This will help prevent the vent from collapsing. Once this is complete, connect any fans or other motors to your vent, and operate them in order to make sure that the vent is fitted securely and the caulk and tape is not affecting the turning of fans.

Step 3 - Filling the Hole

Now that you have fitted the vent, you should go around to the outside of the roof again and replace the tiles and shingles that you removed earlier. Some pieces will need to be cut in half, or left out altogether, in order to ensure that there is no obstruction of the vent. Once these tiles or slates have been replaced, you should add caulking all around the outside, and then pour a layer of waterproofing roof tar over the surface. This will help to ensure that any cracks left accidentally during the replacing will be watertight. The caulking and tar should be left to dry thoroughly before any fans or motors in the vent are operated again, but the vent should now be safely installed in your roof.