Two Rules for Humidity

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Subtitle: 
To prevent moisture damage from humid air, just do these two things

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Because I’ve written so much about moisture in buildings, I get a lot of questions on the topic. Some are about walls. Some are about the attic. Some are about windows. Some are about the crawl space (which generates the most questions on this topic).

The key to answering a lot of those questions boils down to an understanding of how water vapor interacts with materials. Once you know that, it’s easy to see the two rules for preventing damage from humidity.

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Two Rules for Humidity

Prime: 
prime

Subtitle: 
To prevent moisture damage from humid air, just do these two things

Images: 

Because I’ve written so much about moisture in buildings, I get a lot of questions on the topic. Some are about walls. Some are about the attic. Some are about windows. Some are about the crawl space (which generates the most questions on this topic).

The key to answering a lot of those questions boils down to an understanding of how water vapor interacts with materials. Once you know that, it’s easy to see the two rules for preventing damage from humidity.

read more

Four Sources of Crawl Space Moisture

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Subtitle: 
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.

read more

Measuring (and Understanding) Humidity

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Humidity sensor recommendations for building professionals and homeowners

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Author’s Note: I can’t even start this blog before thanking Lew Harriman of Mason-Grant Consulting. Lew very patiently and gently hammered me into a much better understanding of humidity in air and its measurement. While any errors or lack of clarity regarding humidity and its measurement are mine, much of the insight and many of the resources mentioned here are Lew’s.

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