How To Install Roof Vent For Bathroom Fan

How to install a bathroom fan vent in the soffit.

How to install roof vent for bathroom fan.

In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. From inside the attic drive a nail through the roof directly above the bathroom vent fan. Then drill a hole on the roof top. Secure the vent flanges with roofing nails before installing the shingles.

The lower half of the flange sits on top of the shingles. To vent a bath fan through the roof you must first prepare a ductwork connecting the roof top to the bathroom. From the roof find the nail and use the utility knife to cut roof shingles from around the nail. Several different ways you can move that hot air to the outside.

One is to route it over to a soffit vent and attach it to the back of the soffit vent but this can work against your exhaust fan because that s actually an air intake so not as good as other methods. Install the roof vent install the roof vent by sliding the top flange under the shingles above it and resting the bottom flange on the shingles below. Nail the lower corners with roofing nails and tar the heads. Attach the drywall filler to a larger piece of wood set it in the hole and drive screws through the ceiling into the wood.

Table of contents hide. Climb into the attic and clear away any insulation from around the hole. Apply a bead of asphalt roof cement on the bottom of the vent. Another method a little bit better is if you have a gable style roof and a gable vent on one end of the house you can attach this to the back of a gable vent.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. Apply roofing adhesive on the underside of the flanges to seal. The patched areas can be repaired with spackling later. For optimum performance locate it between the shower and the toilet.

If the hole is too big you ll need to patch the ceiling. Draw a mark on the bathroom ceiling where you d like to install the vent fan. Check the damper and the screen in prior to installation. Center the nail between two rafters.

Slide the vent under the shingles so they cover the top half of the vent flange. Over there mount the vent hood using tri polymeric locking seal paste and put the nails to strengthen it.