Install Bathroom Exhaust Fan Roof

Secure the vent flanges with roofing nails before installing the shingles.

Install bathroom exhaust fan roof.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. A single exhaust exits through the roof figure a. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. Most roof overhangs today have continuous soffit ventilation strips.

Start in the attic and drill a hole through the roof in the desired vent location. Make sure to check my other vide. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. Climb into the attic and clear away any insulation from around the hole.

The installation is easiest if you re replacing an existing fan. You mount a switch in each bathroom. Access the attic and bring your light cordless drill screws and bathroom fan housing. Try to keep it close to the fan location.

This system is quiet too. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. Leave the drill bit sticking through the roof so you can find the hole. For optimum performance locate it between the shower and the toilet.

The next best location for a bath fan cap is a wall that s at least three to five feet from a roof overhang. Place the fan in the cut out hole so that the bottom edge of the fan is flush with the bottom of the ceiling drywall. You can use the existing switch wires and ductwork. Sinnisjinsulator video includes how to and tips on attic bathroom fans and proper placement and insulation of exhaust hose.

Use the information below to select a fan. 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. You will need a partner for this step as you cannot see the ceiling from this position. Attach the bathroom fan to the joist.