Daniel W
  • Geneva, OH
  • United States
Share on Facebook Share on Facebook Share
  • Featured Blogs
  • Discussions (5)
  • Events
  • Groups
  • Photos
  • Photo Albums
  • Videos

Daniel W's Discussions

Polyiso, roxul & reflective insulation combination

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

 

Daniel W's Page

Latest Activity

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

Profile Information

Company
Home Remedies

Comment Wall (1 comment)

You need to be a member of Home Energy Pros to add comments!

Join Home Energy Pros

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

 
 
 

Photos

Loading…
  • Add Photos
  • View All

Latest Activity

Profile IconBoilers Prices, Duncan Cumming, Tirso De Ubago and 3 more joined Home Energy Pros
51 seconds ago
Anthony Adams posted a status
"Trying to figure heat load for HVAC on bonus room over a garage. Lots of wall space exposed to arttic."
2 hours ago
Hamed Ghanbari replied to Brian's discussion Everything you need to become a energy auditor for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Hello, I am interested to buy a Minneapolis Blower Door DG700. How much is your unit? Thanks. "
14 hours ago
Hamed Ghanbari joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
14 hours ago
Colin Genge updated an event
Thumbnail

Measuring HVAC Performance webinar at Online

February 23, 2016 from 11am to 12pm
If you install, service or test HVAC systems you will want be there for this special webinar.…See More
17 hours ago
Colin Genge updated an event
Thumbnail

Testing for IECC Code Compliance for duct and house leakage webinar at Online

February 16, 2016 from 11am to 12pm
The International Energy Conservation Code (IECC) is in use or adopted in 47 states, the District…See More
17 hours ago
Jan Green posted a status
"I'm honored to be selected to speak at the 2016 RESNET Conference right here in sunny Scottsdale 2/29-3/2/16 with SRP & others!"
19 hours ago
Joe Konopacki posted an event

Duct & Envelope Tightness (DET) Verifier at Temperature Equipment Corporation

February 26, 2016 from 8:30am to 4:30pm
The Duct & Envelope Tightness Certification (DET) was designed by the Midwest Home Performance…See More
20 hours ago

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service