Adjusting Bath Fan Use in Winter

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Do you really need to run it when you shower?

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You may have heard or read somewhere that you should run your bathroom exhaust fan whenever you take a shower and then let it run for a while after you’re done with the shower. Showers increase the humidity in the bathroom. Sometimes it gets high enough to cause condensation to appear on the mirror and other surfaces in the bathroom. And that can result in mold growth.

So you should always run your bath fan when you shower. Or so they say.

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Adjusting Bath Fan Use in Winter

Prime: 
prime

Subtitle: 
Do you really need to run it when you shower?

Images: 

You may have heard or read somewhere that you should run your bathroom exhaust fan whenever you take a shower and then let it run for a while after you’re done with the shower. Showers increase the humidity in the bathroom. Sometimes it gets high enough to cause condensation to appear on the mirror and other surfaces in the bathroom. And that can result in mold growth.

So you should always run your bath fan when you shower. Or so they say.

read more

Four Sources of Crawl Space Moisture

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To stop moisture problems in vented crawl spaces, you have to know where the moisture comes from

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Here in the southeastern U.S., we have a lot of crawl spaces. Most are vented. Even most new ones are vented. It’s not because it’s the best way to keep them dry. That’s certainly not true. We have enough research on crawl spaces to know better. No, they’re vented because foundation vents got into the code decades ago and, once there, they’ve been difficult to dislodge.

So if you have a vented crawl space, especially in a humid climate, it most likely has moisture problems. And where does that moisture come from? Let’s take a look.

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Four Sources of Crawl Space Moisture

Prime: 
prime

Subtitle: 
To stop moisture problems in vented crawl spaces, you have to know where the moisture comes from

Images: 

Here in the southeastern U.S., we have a lot of crawl spaces. Most are vented. Even most new ones are vented. It’s not because it’s the best way to keep them dry. That’s certainly not true. We have enough research on crawl spaces to know better. No, they’re vented because foundation vents got into the code decades ago and, once there, they’ve been difficult to dislodge.

So if you have a vented crawl space, especially in a humid climate, it most likely has moisture problems. And where does that moisture come from? Let’s take a look.

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Is It Possible to Get Condensation on a Sponge?

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A little building science puzzler on moisture and the properties of materials

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I recently taught a class called What the Duct!? at the Builders’ Boot Camp in Virginia. Paul Francisco was one of the other instructors (teaching about indoor air quality), and on the last evening at dinner, our conversation turned to building science. (Imagine that!)

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