Venting a dryer through the roof is not much different than venting it from the wall of the home. The difference is that you must make sure that your roof does not leak after the vent is installed. You will need to use a dryer vent cap that is designed for this type of installation. Once you have the dryer duct work routed to the roof area you will have an idea of where to install the dryer vent cap.
Things You'll Need
- Dryer vent cap
- Tape measure
- Reciprocating saw
- Flat crowbar
- Silicone caulk
- Caulking gun
Locate the position that the roof vent cap will be placed. From inside the attic drive a nail through the roof at the center of the proposed location.
Measure for obstructions on top of the roof. Go to the roof and use a tape measure and make sure there is at least two feet of distance between the nail and chimney or other exhaust pipes.
Place the dryer vent cap over the nail and trace the pipe onto the roof. Use a reciprocating saw and cut the hole in the roof where you just marked it.
Insert the dryer vent cap into the hole. Now you will need to determine which nails need to be removed from the shingles so that the rear of the flashing of the dryer vent cap will set under the shingles.
Remove the dryer vent cap after you have seen which shingles you must place the flashing under. Use a flat crowbar to remove the nails that are located right at the slits of the shingle.
Insert the back flashing under the shingle and insert the rest of the roof dryer vent cap into the hole.
Nail the dryer vent cap to the roof. Apply a thin coat of silicone caulk over the exposed nail heads using a caulking gun. Nail the shingles where necessary.
Go inside the attic and attach the dryer duct work to the dryer vent cap pipe. Tighten the duct work by using a screwdriver to secure the clamp.
Tips & Warnings
- It may be necessary to cut some shingles directly under the flashing near the hole. You want the flashing portion of the dryer vent cap to sit flush just like shingles do.