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

'Classic' discussion from HP Forum Archives: A deep dive into the merits and pitfalls of energy modeling

Started Oct 29, 2019 0 Replies

Those of you who have followed this forum for at least two years may recall the merger between Home Energy Pros and the Home Performance Forum. For the benefit of those who weren't around then (or…Continue

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, 2019. 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

 

David Butler's Page

Latest Activity

David Butler replied to Kyle Baker's discussion Thoughts on EVs? Love em or hate em?
"Jan wrote: "charging is super cheap with Tesla chargers around town" Tesla's price comparison table on its website refers to the average price of 26 cents per kWh for it's charging network. Still less than fossil fuel for sure,…"
Jan 30
David Butler replied to Kyle Baker's discussion Thoughts on EVs? Love em or hate em?
"@Kyle, I spotted an error in the article. You wrote: > Washington DC: <$0.10 per kWh (benefits of hydropower) I think you're referring to Washington State, not DC. And in the previous paragraph, you wrote: > For example, in Arkansas,…"
Jan 27
David Butler replied to Sean Wiens's discussion Insulating Chilled/Cold Water Lines
"@Sean, by closed cell foam noddles, I think Mark is referring to the Armaflex or similar. I'm guessing he missed in your original post that that's what you're planning to use."
Jan 20
David Butler replied to Sean Wiens's discussion Insulating Chilled/Cold Water Lines
"The wood itself provides some resistance (about R-1.25 per inch for a typical stud) so you just need to butt and seal the insulation tubes to the stud face. Injecting foam into the seam seems like overkill. I would just overdrill the penetration…"
Jan 17
David Butler replied to Dan Antonioli's discussion Condensation Quick Fix
"Dan wrote: "Moisture inside the barn is not the issue, it's the condensation on the underside of the metal roof. It collects and it drops." Are there animals in the barn? That moisture has to come from somewhere. I don't think…"
Jan 11
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"Yes, quite the phone session that was! Having spent time with you at the site early on, it's amazing and exciting to see it all finally come together! After having reduced those sink estimates by 2/3rds, your new total seems realistic. But as…"
Dec 16, 2019
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"The abbreviation HPWH refers to a domestic water heater, not an air-to-water space conditioning heat pump (the latter is also a chiller).  I need to know the HPWH capacity (BTUH) to heat the water via the heat pump alone so we can estimate the…"
Dec 14, 2019
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"Your consumption numbers seem rather high if not unrealistic, especially sink draws, which add up to > 24,000 gals of hot water per year... wow!  I don't have anything close at hand to cite but I think this is way out of line with…"
Dec 14, 2019
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"Sean wrote: "The only question is what will be the cost for the extra 4000K of heating needed if I go with a Hybrid... Not sure that data for this exists easily. Would depend on outdoor temps and operation time of the Hybrid which I do not know…"
Dec 14, 2019
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"you wrote: "I have calculated I would need around 114,600 gals of hot water year" Huh? That's not a credible number. It would cost close to $2,200/yr to heat that much water with an electric storage tank @ 12 cents/kWh (see last…"
Dec 13, 2019
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"Not sure how a locational bias plays into this... it doesn't take much of a swing for daily temps to bracket a given temperature. I just ran a quick script on Vancouver Intl. temp data. Over the last 365 days, daily highs & lows bracketed…"
Dec 12, 2019
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"Regarding ducted exhaust control: "For now it can be manual..." Think about what that means... For much of the time when it's useful, you'll need to switch modes twice daily, perhaps at inconvenient times. But given the scenario…"
Dec 12, 2019
David Butler replied to Sean Wiens's discussion How many BTU required to heat air
"Don't waste your time with that BTU calculator, it's not intended for what you're trying to do. Your followup post is spot-on. Allow me to summarize... It should be self evident that ducting the exhaust air makes sense whenever…"
Dec 12, 2019
David Butler replied to Haley Keegan's discussion Derating / Rating Old Insulation
"I recall BPI had an insulation derating guide for exactly this purpose, but I can't put my hands on it now. Perhaps someone else here can update that document or post a link."
Dec 11, 2019
David Butler replied to Robin Henry's discussion Floor I joists and properly installed insulation
"@Stanley, your strategy for holding batts against the subfloor is interesting. Much better than wire 'insulation compressors'. That 1/2 EPS you're using is relatively inexpensive and since you're not going for full encapsulation,…"
Dec 3, 2019
David Butler replied to Robin Henry's discussion Floor I joists and properly installed insulation
"Robin wrote: "the insulation is resting on the bottom of the drywall or plywood effectively doing nothing." Not true, as long as the exposed cavity sidewalls are insulated and the cavity is tight. As Joe points out, this configuration is…"
Dec 3, 2019

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

 
 
 

Forum

building envelope air tightness studies

Started by Greg O'Beirne in General Forum. Last reply by Greg O'Beirne yesterday. 15 Replies

Watts Up? Pro - Software Download

Started by Todd Abercrombie in General Forum. Last reply by Sean Wiens yesterday. 1 Reply

Thoughts on EVs? Love em or hate em?

Started by Kyle Baker in General Forum. Last reply by Tom Phillips on Friday. 18 Replies

Looking to buy used equipment

Started by Heidi McCullough in General Forum. Last reply by Matt Sharpe on Friday. 1 Reply

Interview Posts for Consumer Education Blog?

Started by Sarah Alexander in General Forum. Last reply by Beverly Lerch Feb 7. 1 Reply

Insulating Chilled/Cold Water Lines

Started by Sean Wiens in HVAC. Last reply by Kent Browning Feb 6. 11 Replies

Your Top Energy Efficiency Tips for the Heating Season

Started by rebecca bridges in Best Practices. Last reply by bebelyn accessdoors Jan 31. 11 Replies

Latest Activity

Brett Little posted an event

Carbon Negative &amp; Non-Toxic HempWool Insulation - Free CE Webinar at Webinar Online

March 4, 2020 from 12pm to 1:15pm
Hempitecture's Tommy Gibbons explains how and why to incorporate hemp building materials into green…See More
18 hours ago
Larry Weingarten posted a blog post

Tired of Blackouts? Get Off The Power Grid!

I live in Northern California where PG&E has recently been shutting off power to large areas…See More
yesterday
Greg O'Beirne replied to Greg O'Beirne's discussion building envelope air tightness studies
"Really intersting points being made inthis discussion. Hawaii is on my list of places to visit one…"
yesterday
Sean Wiens replied to Todd Abercrombie's discussion Watts Up? Pro - Software Download
"This may…"
yesterday
Blake Reid replied to Greg O'Beirne's discussion building envelope air tightness studies
"Thanks, man.  It's Aloha Friday and this is contributing to good vibes.  Working on…"
yesterday
Kent Browning replied to Greg O'Beirne's discussion building envelope air tightness studies
"Blake - I started to not say anything about 'mild climates like Hawaii'. But I read your…"
yesterday
Todd Abercrombie posted a discussion

Watts Up? Pro - Software Download

I haven't used my Watts Up? Pro meter in quite a while, and I'm having trouble pulling data from a…See More
yesterday
Blake Reid replied to Greg O'Beirne's discussion building envelope air tightness studies
"I get your points.  Interisland flights are plentiful & cheap (you know, for commuters) -…"
Friday
Building Performance Association commented on Building Performance Association's blog post New Legislation: The Access to Consumer Energy Information Act Aims to Educate Consumers and Enact Change
"Hi Steve - There are only three states in the US that provide this level of access to energy data.…"
Friday
Kent Browning replied to Greg O'Beirne's discussion building envelope air tightness studies
"The problem of available test agencies and test equipment was addressed in the 2009 IECC (and IRC)…"
Friday
Sydney G. Roberts replied to Greg O'Beirne's discussion building envelope air tightness studies
"In response to the chicken-and-egg conundrum, one approach that we used with success in Georgia was…"
Friday
Tom Phillips replied to Kyle Baker's discussion Thoughts on EVs? Love em or hate em?
"Gasoline and diesel, which are refined from crude oil, drive the world’s transportation…"
Friday

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