How To Install A Bathroom Exhaust Fan Roof Vent

If you have access to the attic the fan can vent either through a gable wall or roof.

How to install a bathroom exhaust fan roof vent.

Draw a mark on the bathroom ceiling where you d like to install the vent fan. Center the nail between two rafters. 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. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

Learn the secrets to running anew exhaust line through the outside wall install a fan and connect the ducting and electrical. Next make sure you have one of the new roof exhaust vents on the roof and properly sealed. This involves running ductwork from the fan usually though an attic and out through the roof. I see many questions about leaking bath exhaust vents.

Apply a bead of asphalt roof cement on the bottom of the vent. The lower half of the flange sits on top of the shingles. In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent.

From inside the attic drive a nail through the roof directly above the bathroom vent fan. If you vent through the roof condensation will drip back into the interior. Install the roof vent by sliding the top flange under the shingles above it and resting the bottom flange on the shingles below. Climb into the attic and clear away any insulation from around the hole.

Secure the vent flanges with roofing nails before installing the shingles. Nail the lower corners with roofing nails and tar the heads. Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof. Most bath vents for homes are 3.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. I recommend replacing the vent pipe with insulated vent pipe. For optimum performance locate it between the shower and the toilet. It is because of this that many builders tend to advise against this method.

In order to accomplish this the roof has to have a hole cut in it. 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. Avoid venting through a soffit vent or ridge vent. Next make sure it is securely fastened on both ends of the pipe.