How To Install A Bathroom Exhaust Fan Roof Vent

This involves running ductwork from the fan usually though an attic and out through the roof.

How to install a bathroom exhaust fan roof vent.

Apply roofing adhesive on the underside of the flanges to seal. Install the roof vent by sliding the top flange under the shingles above it and resting the bottom flange on the shingles below. Draw a mark on the bathroom ceiling where you d like to install the vent fan. It is because of this that many builders tend to advise against this method.

The lower half of the flange sits on top of the shingles. Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof. Apply a bead of asphalt roof cement on the bottom of the vent. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.

The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent. Next make sure it is securely fastened on both ends of the pipe. I see many questions about leaking bath exhaust vents. Here is the link to th.

In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. 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. Next make sure you have one of the new roof exhaust vents on the roof and properly sealed. Center the nail between two rafters.

For optimum performance locate it between the shower and the toilet. 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. Slide the vent under the shingles so they cover the top half of the vent flange. Secure the vent flanges with roofing nails before installing the shingles.

Climb into the attic and clear away any insulation from around the hole. Most bath vents for homes are 3. Avoid venting through a soffit vent or ridge vent. I recommend replacing the vent pipe with insulated vent pipe.

If you have access to the attic the fan can vent either through a gable wall or roof. Nail the lower corners with roofing nails and tar the heads. If you vent through the roof condensation will drip back into the interior. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.