Roy Sakamoto
  • Clovis, CA
  • United States
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Roy Sakamoto's Discussions

Whole house air leakage

Started this discussion. Last reply by Ed Minch Apr 1, 2014. 14 Replies

I have reviewed, tested, studied, asked, and analyzed the many facets of whole house air leakage.  I am still somewhat unsure what constitutes a respectable level of air leakage to a home.  Newer…Continue

 

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Ed Minch replied to Roy Sakamoto's discussion Whole house air leakage
"This is definitely worth investigating if you are an air sealer and are forced to use the ACH50 metric. First look at a 1500 ft2 ranch on a slab at 50'X30' with an 8' ceiling.  It has a volume of 12,000 ft3, and a surface area,…"
Apr 1, 2014
Cameron Millard replied to Roy Sakamoto's discussion Whole house air leakage
"Air sealing can also provide an opportunity to reduce contamination from dirty attics and crawlspaces though, but you are right that ventilation is key which is why I think crawlspace fans are a good idea."
Apr 1, 2014
Cameron Millard replied to Roy Sakamoto's discussion Whole house air leakage
"This jives with my experience trying to air seal a very small house - lots of caulk and foam and not much of a result (only a few hundred CFM after several hours of work).  Bigger homes seem easier to reduce in my experience."
Apr 1, 2014
Ed Minch replied to Roy Sakamoto's discussion Whole house air leakage
"Dob Do the math on that one - any volume based measure favors big houses because the volume is not what is leaking - the surface area is.  A small house has more surface area per ft3 than a big house, so gets penalized.  I have measured…"
Mar 27, 2014
David Eakin replied to Roy Sakamoto's discussion Whole house air leakage
"Don, I'm not sure I follow. Is it because the 2012 IECC does not include the basement area as conditioned space, or that slab houses are viewed as being "leakier" than houses with double the flooring footprint and having a basement,…"
Mar 27, 2014
Ed Minch replied to Roy Sakamoto's discussion Whole house air leakage
"Don H- +1 to everything you said.  Something to add is that it depends entirely on the metric you use. If you use ACH50 which is becoming the norm where the 2012 IECC is used, you must seal every square foot of envelope on a 1200 ft2 house on a…"
Mar 27, 2014
David Eakin replied to Roy Sakamoto's discussion Whole house air leakage
"I have been thinking quite a bit about this topic recently, and the more I think about it the less convinced we are on the right track. First - blower door tests DO NOT give an indication of air infiltration; they give a slight indication of the…"
Mar 27, 2014
Richard Beyer replied to Roy Sakamoto's discussion Whole house air leakage
"Old homes are not great candidates for ASHRAE standards. It can be achieved with risk. Unless the energy rater understands all the hidden problems associated with the old home in question, air sealing can present some long term health issues with…"
Mar 26, 2014
Barbara Smith replied to Roy Sakamoto's discussion Whole house air leakage
"This report has some numbers from the Wisconsin Weatherization Program. http://homeenergyplus.wi.gov/docview.asp?docid=24319&locid=25 For example, Figure 7. shows the blower door readings before and after weatherization,…"
Mar 25, 2014
Don Hynek replied to Roy Sakamoto's discussion Whole house air leakage
"This doesn't have to be that complicated…. If your goal is to save energy, the answer is always "get it as tight as possible" If your goal is to save energy and assure indoor air quality, the answer is "build tight and…"
Mar 24, 2014
Roy Sakamoto replied to Roy Sakamoto's discussion Whole house air leakage
"Thank you for your reply.  You have some good points to watch out for."
Mar 24, 2014
Cameron Millard replied to Roy Sakamoto's discussion Whole house air leakage
"Roy, I have not tested for humidity post-retrofit, but that isn't a bad idea. I do know the crawlspace fan works to dry out the crawlspace; we had a client with a flooded basement and installed a vent fan which dried it right up in a few…"
Mar 24, 2014
Roy Sakamoto replied to Roy Sakamoto's discussion Whole house air leakage
"Thank you for your input.  I am curious if after you complete sealing the rim joists or other areas whether you performed any moisture tests after the sealing to determine the moisture content.  Our area does not normally have moisture…"
Mar 23, 2014
Cameron Millard replied to Roy Sakamoto's discussion Whole house air leakage
"I've tackled quite a few air sealing projects on homes built in the 1800's in the Colorado Rockies.  They can be quite a challenge to air seal, even at the 10% required by our utility for rebate funds.  If the crawlspace is…"
Mar 20, 2014
Roy Sakamoto posted a discussion

Whole house air leakage

I have reviewed, tested, studied, asked, and analyzed the many facets of whole house air leakage.  I am still somewhat unsure what constitutes a respectable level of air leakage to a home.  Newer homes built to higher standards are not a problem but when you get into older homes with varying degrees of air leakage depending on when they were built and by whom presents some interesting situations.  The recommended rates of leakage on older homes do not present the same situation as new homes as…See More
Mar 14, 2014
Roy Sakamoto is now a member of Home Energy Pros
Apr 23, 2012

Profile Information

Company
Action Air Conditioning, Heating and Plumbing
Professional Certification
C-20, C-36, NATE, BPI
Professional Interests
Whole house analyst, Energy remodeler, energy auditor, energy analyst

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At 3:01pm on April 23, 2012, Diane Chojnowski said…

Hi Roy,

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!

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