How To Install Roof Vent For Bathroom Fan

Climb into the attic and clear away any insulation from around the hole.

How to install roof vent for bathroom fan.

Apply roofing adhesive on the underside of the flanges to seal. Table of contents hide. Apply a bead of asphalt roof cement on the bottom of the vent. If the hole is too big you ll need to patch the ceiling.

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. Cut a piece of drywall to make the ceiling hole the right size for your fan. How to install a bathroom fan vent in the soffit. Attach the drywall filler to a larger piece of wood set it in the hole and drive screws through the ceiling into the wood.

Nail the lower corners with roofing nails and tar the heads. Draw a mark on the bathroom ceiling where you d like to install the vent fan. In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. 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.

Slide the vent under the shingles so they cover the top half of the vent flange. Then drill a hole on the roof top. For optimum performance locate it between the shower and the toilet. The lower half of the flange sits on top of the shingles.

Next we must slip a worm drive metal clamp on the inside part of duct liner. The patched areas can be repaired with spackling later. 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. Check the damper and the screen in prior to installation.

To vent a bath fan through the roof you must first prepare a ductwork connecting the roof top to the bathroom. Secure the vent flanges with roofing nails before installing the shingles. Center the nail between two rafters. From the roof find the nail and use the utility knife to cut roof shingles from around the nail.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. Over there mount the vent hood using tri polymeric locking seal paste and put the nails to strengthen it.