David Butler
  • Male
  • Huachuca City, AZ
  • United States
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How would you insulate this roof?

Started this discussion. Last reply by John Hatfield 15 hours ago. 9 Replies

I have a client who needs your help. In the early 80's, he and his wife built a beautiful off-grid home on a small island near Fort Myers, FL. It currently serves as a convenient getaway, but as they…Continue

 

David Butler's Page

Latest Activity

John Hatfield replied to David Butler's discussion How would you insulate this roof?
"David I think the finish edge application is critical but several un-knows exist. Such as how far does the edge overhang and what does the enclosure need to look like in relation to the rest of the house? What is the wind uplift condition to…"
15 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"@Kevin, that article is behind a pay wall. Here's the original posted on Allison's blog: https://www.energyvanguard.com/blog/the-best-way-to-cool-your-attic No doubt Kool Seal or similar would reduce radiant gains but nothing in that…"
16 hours ago
Kevin Miller replied to David Butler's discussion How would you insulate this roof?
"Good question.  I don't know the answer.   I'd love to know whether there is a reflective roofing paint that is safe for potable water.   Sounds like I need to do some research! "
16 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"Hi John, thanks for pointing out my faux pas: I made clear in my original post that rainwater collection is a critical requirement, thus my follow-on comment that a steel over-roof would be overkill is clearly wrong. I'm sure the owner would…"
16 hours ago
John Hatfield replied to David Butler's discussion How would you insulate this roof?
"Kevin, Is the "Kool Seal" product certified for potable water collection?"
16 hours ago
Kevin Miller replied to David Butler's discussion How would you insulate this roof?
"I'd recommend a reflective roof.   Depending on their expected usage of this building, a reflective elastomeric roof paint such as "Kool Seal" might be sufficient without adding another roof surface or insulation. …"
17 hours ago
John Hatfield replied to David Butler's discussion How would you insulate this roof?
"The solution maybe installation of foam fill panels between the existing raised metal ribs within the existing metal roof, then support rails with a polyiso fill with a new metal roof. Working previously in the roofing field I found that not all…"
20 hours ago
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Hi Mike, it's good to get some feedback from the field, and thanks for confirming Gen 3 is now shipping. Sanden's website still says "coming soon" Re: heat tape... it would be ashame to use heat tape (with COP of 1) to prevent…"
yesterday
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"theoretically, let's say you perfectly isolate the HPWH from a heat source. The HPWH's will eventually cool the air to the point that mold will grow. Here's the math: 30x30x8 = 7200 ft3 x 0.075 lbs/ft3 = 540 lbs of air 540 lbs x 0.24…"
Monday
David Butler replied to David Butler's discussion How would you insulate this roof?
"Interesting idea. Commercial roof on a slope! Typical density for roofing spray foam is 2.5 to 3.0 lbs/ft3, depending on expected foot traffic, with R-value of about 6.5 per inch. On 'flat' roofs, the mix is normally set for a slower…"
Monday
Sean Lintow Sr replied to David Butler's discussion How would you insulate this roof?
"You might consider a commercial grade roof foam spray (higher density than normal CC Foam) with a coating over that - if they want metal over that, that's fine as there are some special clips & rails they can use but the clips need to be…"
Monday
David Butler posted a discussion

How would you insulate this roof?

I have a client who needs your help. In the early 80's, he and his wife built a beautiful off-grid home on a small island near Fort Myers, FL. It currently serves as a convenient getaway, but as they approach retirement, they want to install a limited amount of air conditioning in the form of a couple of small, high-SEER ductless mini-splits. The aging 12V PV system is quite small -- the refrigerator is propane powered, and there's no well (fresh water supplied by rainwater collection). So…See More
Sunday
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Regarding Sanden... US distribution is fairly new so I imagine they make it easy to set up an account, or would sell direct. The plumber would have to be on board, though. The current model is good to -15F, and the forthcoming Gen3 is good to -20F…"
Oct 14
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Yes, now that I've taken time to make sure I understand the physics, I'm in full agreement. Consider that with an air-air heat pump or A/C, the heat rejected by the condenser is roughly the same as the heat absorbed by the evaporator. A…"
Oct 14
David Butler replied to Sean Lintow Sr's discussion Water Saver or Gimmick? in the group Best Practices (Residential)
"Since others reactivated this thread, I'll chime in. In recent years I been including DHW distribution in my design review conferences. As others noted, each house is different, requiring its own solution. The device Sean mentioned in the OP…"
Oct 13
David Butler joined Sean Lintow Sr's group
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Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what needs to find it's way to the dust bin of history?See More
Oct 13

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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Latest Activity

Stanley Layman replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"A tankless water heater can be a bit pricey. Tankless water heaters can range from $300 to $1100 or…"
16 minutes ago
John Hatfield replied to David Butler's discussion How would you insulate this roof?
"David I think the finish edge application is critical but several un-knows exist. Such as how far…"
15 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"@Kevin, that article is behind a pay wall. Here's the original posted on Allison's…"
16 hours ago
Kevin Miller replied to David Butler's discussion How would you insulate this roof?
"Good question.  I don't know the answer.   I'd love to know whether there…"
16 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"Hi John, thanks for pointing out my faux pas: I made clear in my original post that rainwater…"
16 hours ago
John Hatfield replied to David Butler's discussion How would you insulate this roof?
"Kevin, Is the "Kool Seal" product certified for potable water collection?"
16 hours ago
Mike Berg joined Tom White's group
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Weatherization

Share your concerns and successes as a weatherization professional, or information for this…See More
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