How To Install A Bathroom Exhaust Fan Roof Vent

Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof.

How to install a bathroom exhaust fan roof vent.

Apply a bead of asphalt roof cement on the bottom of the vent. In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. For optimum performance locate it between the shower and the toilet. Most bath vents for homes are 3.

Install the roof vent by sliding the top flange under the shingles above it and resting the bottom flange on the shingles below. I see many questions about leaking bath exhaust vents. This involves running ductwork from the fan usually though an attic and out through the roof. Learn the secrets to running anew exhaust line through the outside wall install a fan and connect the ducting and electrical.

Center the nail between two rafters. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Next make sure you have one of the new roof exhaust vents on the roof and properly sealed. Here is the link to th.

I recommend replacing the vent pipe with insulated vent pipe. Avoid venting through a soffit vent or ridge vent. From inside the attic drive a nail through the roof directly above the bathroom vent fan. Climb into the attic and clear away any insulation from around the hole.

In order to accomplish this the roof has to have a hole cut in it. Secure the vent flanges with roofing nails before installing the shingles. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.

If you vent through the roof condensation will drip back into the interior. 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. 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.

It is because of this that many builders tend to advise against this method. Next make sure it is securely fastened on both ends of the pipe. If you have access to the attic the fan can vent either through a gable wall or roof. Apply roofing adhesive on the underside of the flanges to seal.