Daniel W
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Polyiso, roxul & reflective insulation combination
11 Replies

I am working on solutions for a cathedral type ceiling rehab project in a century home in Northern Ohio. The challenge is that there is limited space for insulation and limited ceiling height. There…Continue

Tags: polyiso, insulation, reflective, roxul

Started this discussion. Last reply by Daniel W Dec 27, 2012.

 

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Daniel W replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"Excellent help and great link -- thank you, Sean!"
Dec 27, 2012
Daniel W replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
":-)"
Dec 27, 2012
Ed Minch replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"Why not just fill up the cavity with 19 layers of the Prodex for a total of R-300+?? That would put the condensible surface - - -?? And with that many shiny surfaces the heat would not be able to escape. Ed Minch"
Dec 27, 2012
Sean Lintow Sr replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"To echo Pat's thoughts below - you need to check out the codes on Hot Roofs or as the IRC calls them "unvented attic assemblies" For 2009 it is section 806 & there are other areas to that do apply - 2 big ones to consider 5.3…"
Dec 27, 2012
Pat Dundon replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"Don't do that. Keep your first plan. Permeable materials interior of impermeable materials in cold climates."
Dec 26, 2012
Daniel W replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"One more question -- is there any difference in performance if I reverse the layers of insulation -- that is, if I placed the batt insulation against the roof deck, then installed the polyiso toward the lower surface of the joists, then finally,…"
Dec 26, 2012
Bud Poll replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"Hi Danial, I ran into this link which deals with rigid foam plus compressed fiberglass insulation.  The pdf is covering how fiberglass increases in r-value per inch when compressed.  But their teat involves a 5.5" cavity and…"
Dec 26, 2012
Daniel W replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"Thank you, Pat, Bud & Sean.  Yes, the reflective insulation's claims seemed to be based on a sealed airspace rather than the product's performance. I'm going to try to get approval for your suggestion of 1" rigid over…"
Dec 25, 2012
Pat Dundon replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"I would suggest 3" of foam and an R-13 fiberglass batt. The interior application of rigid foam is the best addition to that system. The 3 inch foam application without stuffing but with the rigid over the rafters is a good application your…"
Dec 25, 2012
Daniel W's discussion was featured

Polyiso, roxul & reflective insulation combination

I am working on solutions for a cathedral type ceiling rehab project in a century home in Northern Ohio. The challenge is that there is limited space for insulation and limited ceiling height. There is no viable ventilation in the application (timber frame construction). I am considering a layered application (see attached illustration) -- from the exterior sheathing down of 2" polyiso foam (r11), 3.5" of rock wool (r15) and then using either Prodex Total (r-16, 5mm Reflective Insulation) or…See More
Dec 24, 2012
Bud Poll replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"Hi Danial and Sean, I went to their web site and it is sad they are allowed to post such claims about their products.  Two by six rafters are simply limited as to how much insulation you can put between them and then limited by conduction…"
Dec 24, 2012
Sean Lintow Sr replied to Daniel W's discussion Polyiso, roxul & reflective insulation combination
"Excuse me as I try to stop laughing... Ok, now please repeat after me, there is no such thing as an R16 reflective product. The highest R-Value one can get is basically a .5 to 1 and that is caused by a 1" airspace & not the product…"
Dec 24, 2012
Daniel W posted a discussion

Polyiso, roxul & reflective insulation combination

I am working on solutions for a cathedral type ceiling rehab project in a century home in Northern Ohio. The challenge is that there is limited space for insulation and limited ceiling height. There is no viable ventilation in the application (timber frame construction). I am considering a layered application (see attached illustration) -- from the exterior sheathing down of 2" polyiso foam (r11), 3.5" of rock wool (r15) and then using either Prodex Total (r-16, 5mm Reflective Insulation) or…See More
Dec 24, 2012
Diane Chojnowski left a comment for Daniel W
"Hi Daniel, 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!…"
Dec 2, 2012
Daniel W is now a member of Home Energy Pros
Nov 25, 2012

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At 4:19am on December 2, 2012, Diane Chojnowski said…

Hi Daniel,

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 upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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