David Butler
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  • 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 David Byrnes's discussion When can an oversized A/C be a good thing?
"David, please explain your comment: "...utilities are squeezing homeowners to play the demand/ peak hours game" As an aside... Earlier in my career (1980's) I had the opportunity to work on advanced load control projects, including a…"
Feb 9
David Butler replied to David Byrnes's discussion When can an oversized A/C be a good thing?
"@D.Byrne: After reading Kent's spot-on post today, I referred back to your blog linked in the original post (which admittedly, I didn't look at prior to my earlier comment). I hate to throw you under the bus (really!) but there's a…"
Feb 6
David Butler replied to Daniel Baur-McGuire's discussion Cross laminated Polyethylene vs non cross laminated
"Are your referring specifically to a closed crawl space? It makes a difference in the thickness necessary to maintain a good air and vapor seal given the potential for foot traffic."
Jan 8
David Butler replied to David Butler's discussion Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)
"I also thought the Section R316.5.11 exception only applied to the thermal barrier requirement. After all, it specifically refers to the thermal barrier.  But as it turns out, I was confused about the relationship between thermal and ignition…"
Jan 2
Matt Sharpe replied to David Butler's discussion Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)
"I also believe that the exception Peter refers to in R316.5.11 is an exception to the thermal barrier requirement. So if you don't meet those criteria for an exception (thickness of foam, density, or flame spread) then you just install the…"
Jan 2
Matt Sharpe replied to David Butler's discussion Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)
"use a spray foam that is approved as an ignition barrier … and while you are at it use a foam that has low Global Warming Potential, something like http://sesfoam.com/download/msds-sucraseal-0-5-lb-spf-2/?wpdmdl=1069 ; that's not an…"
Jan 2
Pete Fjeld replied to David Butler's discussion Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)
"R316.5.11 says not more than 3-1/4 inches of certain density foam and some other verbiage need not be covered in the perimeter joist space."
Jan 2
Charles Buell replied to David Butler's discussion Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)
"Depending on the type of floor joists you may already be required to cover the floor joists.  There are spray-on ignition barriers as well."
Jan 2
David Butler posted a discussion

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

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" foil-faced polyiso on the walls (below grade) and 6" oc-SPF in the rim band area (mostly above grade). Spraying the rim band is obviously a LOT easier than cutting & piecing foam board between the floor trusses and over the double end pins.Since there's no ceiling, an alternate thermal and ignition…See More
Jan 1
David Butler replied to David Meiland's discussion Air gap above floor insulation--how big is the impact?
"@Bruce, sorry, I just noticed that the original poster did indeed mention adding more insulation to fill the cavity. I think David was thinking that additional insulation would help hold the original batt tight to the floor. But he still needs some…"
Dec 19, 2018
David Butler replied to David Meiland's discussion Air gap above floor insulation--how big is the impact?
"Bruce wrote: "What if they where 16" deep "I" joist? Further to tell the homeowners that more insulation is required is also not reasonable." I don't think anyone suggested that the joist bays be filled. Insulation can…"
Dec 17, 2018
David Butler replied to David Meiland's discussion Air gap above floor insulation--how big is the impact?
"Charles wrote: "if the floor is properly insulated how can the floor be a different temperature than the room temperature" Any time you have a steady-state delta-T across an assembly, the indoor surface will be cooler (or warmer) than room…"
Dec 14, 2018
David Butler replied to David Meiland's discussion Air gap above floor insulation--how big is the impact?
"Adding an airspace changes the temperature gradient, as noted in Joe's doc, thus making the floor slightly warmer, with slight increase in heat loss. However, the real issue here is encapsulation, or lack thereof.  Without 6-side…"
Dec 13, 2018
David Butler replied to David Byrnes's discussion When can an oversized A/C be a good thing?
"Keep in mind that for all but the hottest hours, a tightly sized system already has excess capacity. Even at design conditions, it doesn't take much extra capacity to recover from setback. Many of my clients use setback (actually 'set…"
Dec 13, 2018
David Butler replied to Brett Little's discussion Do ductless systems do better on the HERS?
"Hi Sean, my comment re: actionable cooling load was about the application of ductless, not related to Brett's question on impact on HERS. Sorry if I conflated the two."
Nov 16, 2018
David Butler replied to Brett Little's discussion Do ductless systems do better on the HERS?
"By 'actionable', I mean the load is such that the homeowner actually needs to use A/C, as opposed to what the software might predict. Most of the US has actionable cooling loads, except higher elevations. I explain my logic for not using…"
Nov 15, 2018

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

 
 
 

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