Venting Exhaust Fans Through the Roofing System

Living Home

February 15, 2022
4 min read
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Vent an exhaust fan the appropriate method– through a roofing hood.

Household Handyman Next Job

Intro

Vent your bath and kitchen area exhaust fans through the roofing through an unique roofing hood. Venting through a roofing vent or tiring them in the attic might trigger wetness issues and rot.

Tools Required

Products Required

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Job step-by-step (3 )

Action 1

Vent exhaust fans through a roofing hood

Roofing system vent hood information

The very best exhaust fan venting is through smooth, stiff ducts with taped joints and screwed to an unique vent hood. Although this isn'' t constantly possible in attic crawl areas, you need to constantly insulate the duct to avoid condensation issues. You can discover 4-in. duct currently covered in insulation in your home centers. If you'' re lured to vent your exhaust fan through an existing roofing vent, and even vent it into the attic, put on'' t do it. Initially, you'' ll partly obstruct your roofing vent with the piping, lowering the circulation of cooling air through your attic. Second, throughout cold winter seasons, you'' ll be blowing warm, damp air onto a cold surface area (the roofing vent and roofing plywood). The water will condense and leak into the insulation listed below and maybe into your house. Unique restroom fan roofing vents with an internal damper that opens just when the fan is blowing will send out damp air outdoors and keep cold air out of your house.

How to Fix a Restroom Fan

Action 2

Setting Up a Vent Hood on the Roofing System

Start in the attic and drill a hole through the roofing in the wanted vent area. Attempt to keep it near to the fan area. Leave the drill bit sticking through the roofing so you can discover the hole. From up on the roofing, utilize a jigsaw or reciprocating saw to cut a 4-in. round hole. Next, ration a square somewhat bigger than the extending part of the vent. Eliminate the asphalt shingles with a hook blade suited an energy knife. Carefully pry up the shingles around the hole, including the vent to move under the very first course.

Utilize an In-Line Fan to Vent 2 Restrooms

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Action 3

Apply asphalt roofing cement

Use a bead of asphalt roofing cement on the bottom of the vent. Move the vent under the shingles so they cover the leading half of the vent flange. The lower half of the flange sits on top of the shingles. Nail the lower corners with roof nails and tar the heads.

Selecting a Whole Home Fan

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