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.

If you have access to the attic the fan can vent either through a gable wall or roof. I recommend replacing the vent pipe with insulated vent pipe. It is because of this that many builders tend to advise against this method. Apply roofing adhesive on the underside of the flanges to seal.

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. Apply a bead of asphalt roof cement on the bottom of the vent. This involves running ductwork from the fan usually though an attic and out 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. The lower half of the flange sits on top of the shingles. Next make sure it is securely fastened on both ends of the pipe.

Center the nail between two rafters. 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. From inside the attic drive a nail through the roof directly above the bathroom vent fan. Slide the vent under the shingles so they cover the top half of the vent flange.

Climb into the attic and clear away any insulation from around the hole. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. If you vent through the roof condensation will drip back into the interior. For optimum performance locate it between the shower and the toilet.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. In order to accomplish this the roof has to have a hole cut in it. Draw a mark on the bathroom ceiling where you d like to install the vent fan. Most bath vents for homes are 3.

I see many questions about leaking bath exhaust vents. Install the roof vent by sliding the top flange under the shingles above it and resting the bottom flange on the shingles below. Learn the secrets to running anew exhaust line through the outside wall install a fan and connect the ducting and electrical. In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.