Chris Stratton
  • Temple City, CA
  • United States
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Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?

Started this discussion. Last reply by Brian Robinson Aug 26. 10 Replies

I am about to install a 50-gallon Rheem heat pump water heater in our garage at our house near Pasadena, CA. (after this installation, our home will be all-electric. yay!)I watched Bruce Manclark's…Continue

Technical question about mini split heat pump line set maximum length

Started this discussion. Last reply by Chris Stratton Feb 21, 2018. 3 Replies

Hello!I'm installing a two-zone Mitsubishi mini split (in Pasadena, CA area, 1400 sf, single family detached, one-story home, if context is relevant). This is my first install, and I am trying to…Continue

 

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Latest Activity

Dennis Heidner replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"If it is a gas heater - it must be raised  X inches (typically something like 12") above the concrete floor such that gasoline fumes from a car are not immediately pulled into the combustion area and ignited."
Aug 27
Brian Robinson replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Probably would be fine as you propose (plywood layer over any foam) but I would suggest you check with your local code office to make sure you use foam / assembly that meets life-safety (fire) code.  Not all foams meet this essential safety…"
Aug 26
Brad Cook replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Not all insulation is the same. For example, Dow's Super Tuf-R polyiso has a compression strength of  25 psi (3,600 lbs per sq.ft.) and a permeance of <0.03 perm, but IKO's Enerair has a compression strength of 20 psi (2,880 lbs…"
Aug 23
R Higgins replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Thanks for explaining why EPS works better for this"
Aug 20
Dennis Heidner replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"I've used the same approach when replacing furnaces and HVAC equipment.  Seems crazy to set duct work onto concrete floors, or set an updraft furnace on a concrete floor with the return vent ducting set on the concrete floor feeding into…"
Aug 19
Chris Stratton replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Thank you, Dennis. I can benefit from your experience. I was considering the plywood to evenly distribute, glad to hear experienced others have had the same impulse. "
Aug 19
Chris Stratton replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Thank you, Mick. Very helpful. Definitely leaning towards EPS or XPS at this point."
Aug 19
Chris Stratton replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Thank you, Sean."
Aug 19
Dennis Heidner replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Personally I would NOT use polyiso in this case.  I've seen it age ungracefully in garages and you have weight ontop of it.  I'd stick with something like an Dow XPS Formula 250 - which I believe has a 250 #/square foot. …"
Aug 19
Mick Lane replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"Technically EPS is "structural". PolyIsoCyanurate is more compressible. It also doesn't do well with shear, tension, hence the foil face. There is also a famous story about the failure of the Green Roof on the Ford Factory that…"
Aug 19
Sean Lintow Sr replied to Chris Stratton's discussion Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?
"1st for anyone wondering - do not do this for gas Sure if you put a drip pan underneath the water heater - so concrete, foam, drip pan, water heater Are you sure you can lose that inch or two of height though - most of those units are freaking tall…"
Aug 19
Chris Stratton posted a discussion

Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?

I am about to install a 50-gallon Rheem heat pump water heater in our garage at our house near Pasadena, CA. (after this installation, our home will be all-electric. yay!)I watched Bruce Manclark's and Wade Cohn's excellent how-to installation video and noticed the…See More
Aug 18
Chris Stratton replied to Brennan Less's discussion Summer mid-day Condensation in newly insulated unvented, cathedral ceiling using foil-faced polyiso
"Sorry this is happening, Brennan. Sounds like you're set on an unvented assembly (i.e., no air gap, soffit and ridge vents)? If it's the issue Ed is describing, maybe 1" polyiso continuous across the rafters could keep them from…"
Jul 26

Profile Information

Company
JCS Design Build
Role in Home Performance Marketplace
Architect / designer, Building energy modeler, Contractor: general (new/remodel), Energy auditor / assessor / analyst, Researcher (Lab. academia. etc.)
Professional Certification
BPI, LEED

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At 8:57am on January 4, 2018, Diane Chojnowski said…

Hi Chris,

Welcome to Home Energy Pros Forum. 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 upload your profile photo.

Thanks!
Diane, HEP Forum Moderator

 
 
 

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