Bathroom Insulation and Ventilation

By Robert Robillard on Bathrooms

Bathroom Insulation and Ventilation

Fan Timer Switch

Run the Fan Longer!

A bathroom fan collects the bathroom’s moist air and immediately expels it outdoors. Using a fan while showering but immediately turn it off when done, does not resolve bathroom humidity issues.

The BEST advice I can give you to keep moisture down in a bathroom is to run your fan longer.  The fan must also run long enough to exhaust the moisture.

Fan Controls

It is recommended that a bath fan runs during, as well as,20 minutes after using the shower. One way to achieve this is through the use of a fan timer.

Installing a timer switch will ensure that the fan has time to work by exhausting the room or moist air that is floating in the air after the shower is complete.

Bathroom Insulation and Ventilation

Installing Exterior Vent Hood

Vent to the Exterior

Your bathroom fan MUST vent to the exterior of the house via plastic or metal vent cap, with a backdraft damper.  Most vents exit an exterior wall but can also vent out roofs and soffits.

Bathroom Insulation and Ventilation

Exterior Bath Vent Hood


Choosing the best exhaust fan system is an important part of your bathroom remodel. A quality bathroom fan, properly installed will remove moisture and odors from your bathroom which will  improve your indoor air quality.

Remember to take the time to thoroughly understand your bathroom ventilation and insulation needs and make sure that you scope them out in your next remodeling project.

Bathroom Insulation and Ventilation

Bath Remodel – American Standard Plumbing Fixtures

Bathroom Remodeling Series – Insulation and Ventilation – Video 5


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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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