How To Install A Bathroom Exhaust Fan Roof Vent

Apply roofing adhesive on the underside of the flanges to seal.

How to install a bathroom exhaust fan roof vent.

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Next make sure it is securely fastened on both ends of the pipe. Apply a bead of asphalt roof cement on the bottom of the vent. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent.

I see many questions about leaking bath exhaust vents. Center the nail between two rafters. If you have access to the attic the fan can vent either through a gable wall or roof. This involves running ductwork from the fan usually though an attic and out through the roof.

Install the roof vent by sliding the top flange under the shingles above it and resting the bottom flange on the shingles below. Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof. Draw a mark on the bathroom ceiling where you d like to install the vent fan. In order to accomplish this the roof has to have a hole cut in it.

Nail the lower corners with roofing nails and tar the heads. If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. Climb into the attic and clear away any insulation from around the hole. Learn the secrets to running anew exhaust line through the outside wall install a fan and connect the ducting and electrical.

The lower half of the flange sits on top of the shingles. I recommend replacing the vent pipe with insulated vent pipe. I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.

Secure the vent flanges with roofing nails before installing the shingles. It is because of this that many builders tend to advise against this method. Avoid venting through a soffit vent or ridge vent. Most bath vents for homes are 3.

If you vent through the roof condensation will drip back into the interior. From inside the attic drive a nail through the roof directly above the bathroom vent fan. For optimum performance locate it between the shower and the toilet. Next make sure you have one of the new roof exhaust vents on the roof and properly sealed.