David Butler
  • Male
  • Huachuca City, AZ
  • United States
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David Butler's Discussions

Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)

Started this discussion. Last reply by David Butler Jan 2. 5 Replies

My new home, currently under construction, has a full basement, half of which will remain unfinished, i.e., no drywall or ceilings. We intend to use that area for storage. My specs call for 2"…Continue

RESNET gets serious about modeling platform consistency

Started Jan 12, 2018 0 Replies

A critical element in ensuring the consistency of HERS Ratings is enhancing the consistency which RESNET accredited HERS Software Programs calculate the HERS Index Score. There are currently…Continue

Belgium’s Lavish Energy Use Sheds Light on More Than Just Its Roads

Started this discussion. Last reply by Don Hynek Dec 18, 2017. 1 Reply

As an avid amateur astronomer, the mitigation of light pollution is one of my passions, notably dovetailing with my professional passion for efficient design. The most efficient outdoor lighting…Continue

 

David Butler's Page

Latest Activity

David Butler replied to John Lile's discussion Air Sealing Manufactured Home
"Notwithstanding the typical low budget for these homes, it seems like encapsulating the crawl might actually cost less in some cases."
13 hours ago
David Butler replied to Green Energy of San Antonio's discussion Does Radiant Barrier Still Work 10 Years Later?
"Since you posted promotional content in a discussion forum, let's have some discussion.... Your web page claims your radiant barrier saves up to 35% on energy bills. That claim defies logic, since A/C typically represents less than 35% of…"
Sep 11
David Butler replied to David Wentling's discussion ERV recommendations
"Thanks, Luke. I agree it wouldn't make sense to design an ERV to accommodate high interior moisture loads. I think the simplest strategy for that is to not rely on an ERV to exhaust excess interior moisture, as they're not designed for…"
Sep 5
David Butler replied to David Wentling's discussion ERV recommendations
"@Luke, since you work for a well-known ERV manufacturer, I'm curious if you have access to latent performance data (other than the single point @ summer conditions typically published). A graph would be ideal. I think most practitioners fail to…"
Aug 22
David Butler replied to David Wentling's discussion ERV recommendations
"I think you're overreacting to the need for humidity control in your location. If indeed there's a need to remove any moisture, an ERV is the least effective way to do that. Moreover, I advise against locating an ERV supply in a closet, as…"
Aug 21
David Butler replied to David Wentling's discussion ERV recommendations
"test"
Aug 20
David Butler replied to David Wentling's discussion ERV recommendations
"I generally recommend against using an ERV as primary ventilation for bathrooms & laundry since the enthalpy core acts to minimize moisture transfer from "high to low" (referring to partial vapor pressure of outdoor and indoor air).…"
Aug 20
David Butler replied to Noah Ray Sanders's discussion Foam/Fiberglass Hybrid Insulation
"Good point about 'fire rating'...  Depending on attic configuration, exposed spray foam insulation must either have a thermal or ignition barrier (typically an intumescent coating), although a few foam products are rated as…"
Aug 19
David Butler replied to Harry Silver's discussion Price-induced decisions that cause electricity demand response: A computational tool
"The LinkedIn group (RESNET BPI) is dead.  It still exists but the group search engine was eliminated so there's no way to access prior discussions. You can only read what appears on the current group feed. The main LinkedIn search engine…"
Aug 13
David Butler replied to Harry Silver's discussion Price-induced decisions that cause electricity demand response: A computational tool
"@Harry, as you can tell from the sound of crickets in response to your posts on demand response modeling, there's apparently little interest in this topic among EE and home performance professionals. You may want to check out the Home…"
Aug 12
David Butler replied to Rob Madden's discussion Where is the money in energy auditing / home rating?
"Ok, now I understand. I think that happens pretty much everywhere. But forgoing energy retrofits at resale doesn't affect code compliance. And in cases where the energy code would apply (i.e., a major renovation or addition), the…"
Jun 14
David Butler replied to Rob Madden's discussion Where is the money in energy auditing / home rating?
"@Eric, please elaborate re: "80-90% of realtor/loan closer will kill energy codes""
Jun 13
David Butler replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"@Dennis, without defending Big-8, I would point out that condensation (on duct surface) is a function of how well the vapor barrier (the outer layer) is sealed. This issue is exactly the same with conventional foil-faced fiberglass duct wrap. It,…"
May 20
David Butler replied to Danny Gough's discussion REALLY????
"Bradford wrote: >I do not see that amount of moisture on that size of coil as a problem, let alone a 3 SF residential coil with limited outside air. Probably not. But to Danny's point, a lot of folks in residential building science &…"
May 16
David Butler replied to Danny Gough's discussion REALLY????
"@Bradford, Danny is referring to residual moisture that remains adhered to the coil after the compressor cycles off. Due to adhesion, a meaningful amount of bulk water will remain on the coil rather than dripping off into the catch pan. Eventually,…"
May 16
David Butler replied to Danny Gough's discussion REALLY????
"Depending on loads and how the stat is managed, there's usually one extended off-cycle per day, long enough for coil to fully dry. But if you still want continuous blower (for other reasons), at least employ an air handler, stat, or 3rd party…"
May 12

Profile Information

Company
Optimal Building Systems
Role in Home Performance Marketplace
Building energy modeler, Researcher (Lab. academia. etc.), Other
Professional Certification
Other
Website URL
http://optimalbuilding.com
LinkedIn Profile
https://www.linkedin.com/in/davidbutler52/

Comment Wall (1 comment)

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At 9:43am on November 1, 2011, Diane Chojnowski said…

Hi David,

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 add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

Latest Activity

Profile IconChris Crawford, Jerry Herron, Baker Electric Home Energy and 1 more joined Home Energy Pros Forum
1 hour ago
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"Yup,  I'm not sure you want to even try tightening up a modular home built before…"
12 hours ago
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"You made some very important observations. It's really important to think about how tight you…"
12 hours ago
Tom Wilson replied to John Lile's discussion Air Sealing Manufactured Home
"Unless the home is on a permanent block or concrete foundation, attempting this is a lost cause.…"
13 hours ago
Tom Wilson replied to John Lile's discussion Air Sealing Manufactured Home
"Actually, it was only in 1976 that any standards at all were applied to mobile homes:  U.S.…"
13 hours ago
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"You didn't mention anything about the age of these homes.  Early mobile/modular homes…"
13 hours ago
David Butler replied to John Lile's discussion Air Sealing Manufactured Home
"Notwithstanding the typical low budget for these homes, it seems like encapsulating the crawl might…"
13 hours ago
Chris Clay replied to John Lile's discussion Air Sealing Manufactured Home
"Thanks Ed, Yes the duct system is outdoors. It came from the factory that way. After working on…"
17 hours ago
Ed Minch replied to John Lile's discussion Air Sealing Manufactured Home
"Chris I agree, and then notice that puts the duct system outside of the house.  So the duct…"
17 hours ago
Home Energy Magazine posted an event
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Getting to Zero Forum: OCTOBER 9-11, 2019 OAKLAND, CALIFORNIA at Oakland, California

October 9, 2019 at 6pm to October 11, 2019 at 7pm
The Getting to Zero Forum is a solutions-based event Dedicated to zero energy and zero carbon…See More
21 hours ago
Chris Clay replied to John Lile's discussion Air Sealing Manufactured Home
"Hi John, The primary air barrier of all mobile home is the subfloor and that is what should be air…"
22 hours ago

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