Install Bath Fan Vent On Metal Roof

Apply roofing adhesive on the underside of the flanges to seal.

Install bath fan vent on metal roof.

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. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. The internal construction of the house does not permit me to vent the bathroom fan elsewhere. Start in the attic and drill a hole through the roof in the desired vent location.

I intend to install the roof vent cap in the section to the right of the section where the plumbing vent is shown. 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. Fwiw here is a url to the photo of the roof. Climb into the attic and clear away any insulation from around the hole.

We explain how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just about any other bathroom ventilation design or installation question you may have. For optimum performance locate it between the shower and the toilet. From the roof find the nail and use the utility knife to cut roof shingles from around the nail. Also this is the section of roof that gets hit directly with heavy winter winds.

Center the nail between two rafters. From inside the attic drive a nail through the roof directly above the bathroom vent fan. Try to keep it close to the fan location. This will involve determining the placement of the vents.

Use rigid metal ducting aluminum or galvanized steel with lengthwise seams facing up and joints sealed with foil tape or duct mastic or rigid plastic pipe. 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. Secure the vent flanges with roofing nails before installing the shingles.

Use a marker or a chalk line to mark the spot on the roof surface where the vent will be placed. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.