Bruce Dichter
  • Santa Rosa, CA
  • United States
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Measuring moisture intrusion

Started this discussion. Last reply by William H Nickerson Jul 28, 2013. 6 Replies

Hi, All,My normal territory is in Northern California, where it's hot and dry.  Recently, however, I helped with an evaluation in the tropics, where the temperature was regularly in the mid-80s, as…Continue

 

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Bruce Dichter replied to Green Iowa AmeriCorps's discussion French door air sealing
"Another option to consider is adding an astragal.  This is a molding fastened to the outside edge of the passive door, lapping over the active door.  Run weather stripping on the inside face that contacts the active door.  This will…"
Nov 15, 2013
Bruce Dichter replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Is it possible that the perforations in the backing of the batt insulation are intended to allow for water vapor diffusion and not serve as an air barrier?  Generally moisture will move from hot to cool, and if it gets trapped in an assembly…"
Oct 18, 2013
William H Nickerson replied to Bruce Dichter's discussion Measuring moisture intrusion
"From his one email notice I just have spent the last 6 hrs. reading and downloading and printing out all that I can about moister removal. I live in central Virginia and the last 2 two weeks seen more condensation on exposed fiberglass bats than I…"
Jul 28, 2013
Bruce Dichter's discussion was featured

Measuring moisture intrusion

Hi, All,My normal territory is in Northern California, where it's hot and dry.  Recently, however, I helped with an evaluation in the tropics, where the temperature was regularly in the mid-80s, as was the relative humidity.  It was their winter.  One of the chief goals is to reduce electrical usage, which in turn means reducing the use of air conditioning.  Much of the load on the AC is to remove moisture, so it strikes me that one strategy is to limit moisture intrusion.  But how do you…See More
Jul 25, 2013
David Meiland replied to Bruce Dichter's discussion Measuring moisture intrusion
"I think you could do a passable job with a box fan, an anemometer, and a manometer."
Jul 20, 2013
Bud Poll replied to Bruce Dichter's discussion Measuring moisture intrusion
"I have an approach for estimating air leakage using just a manometer.  Only slightly better than a wild guess, but so much of what we do is based upon guessing, a little more can only help.  An option for a blower door might be Australia,…"
Jul 20, 2013
Bruce Dichter replied to Bruce Dichter's discussion Measuring moisture intrusion
"Hi, David and Bud, Thanks for your replies.  Full disclosure: I never performed a blower door test.  The island is in Fiji, and remote even by Fijian standards.  Also, the current is 220V.  So I wasn't able to arrange the…"
Jul 20, 2013
Bud Poll replied to Bruce Dichter's discussion Measuring moisture intrusion
"Hi Bruce ad David, The outside air, temp and humidity, sets a baseline for how low you can go without some form of powered mechanicals to remove moisture and or cool the space.  Even a tight house will need to exchange a lot of air to reduce…"
Jul 20, 2013
David Meiland replied to Bruce Dichter's discussion Measuring moisture intrusion
"Someone smarter than me could calculate the rate of vapor diffusion through the various materials you mention (such as the slab floor), given a few facts. I do think it would be worth exploring how much the slab might be contributing to interior…"
Jul 20, 2013
Bruce Dichter posted a discussion

Measuring moisture intrusion

Hi, All,My normal territory is in Northern California, where it's hot and dry.  Recently, however, I helped with an evaluation in the tropics, where the temperature was regularly in the mid-80s, as was the relative humidity.  It was their winter.  One of the chief goals is to reduce electrical usage, which in turn means reducing the use of air conditioning.  Much of the load on the AC is to remove moisture, so it strikes me that one strategy is to limit moisture intrusion.  But how do you…See More
Jul 19, 2013
Bruce Dichter is now a member of Home Energy Pros
Mar 18, 2011

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Company
Living Homes Construction
Professional Certification
licensed general contractor; BPI Building Analyst

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At 6:27pm on March 19, 2011, Diane Chojnowski said…

Hi Bruce,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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