Looking for a good detail for using 1" rigid on exterior

Anyone used 1" rigid in a new exterior wall assembly before?  What are the pros & cons, which rigid product did you use, which weather membrane (some are integral to the foam too).  Any experiences good or bad are welcome.

Views: 119

Reply to This

Replies to This Discussion

I've used XPS rigid foam on both new construction and retro-fit applications, the amount of rigid foam ( R value) will depend on the climate zone you live in, colder climate zones require a higher percentage of the balance between exterior insulation and interior insulation to be on the exterior, for example I live and build in a maritime climate in Alaska, in our area we use a 1/3 - 2/3 rule for exterior insulation with a minimum of 1/3 of the total R value of the wall assembly being on the exterior side. I have used several different types of moisture barriers or house wraps, but usually rely on Tyvek Stucco wrap at the wall sheathing and cover the foam with Tyvek or Typar house wrap. Some will say this not neccessary but I know I sleep well at night knowing that there are several layers of protection between the elements and the wood of the structure.



Possibly overkill, but the Building Science Corp white paper might help:



Interesting Conclusions in the "White Paper".

In Central NY we use 2" of XPS to keep the dew point at heating design temperature (-2°F) outside the wall assembly.  These homes are quite comfortable, get excellent blower numbers, and are well prepared to fend off the universal solvent.


Still, my general policy and universal recommendation is always the same:  "foam is good, more foam is better, and a s***load of foam is best of all."  In my opinion, the concept of "overkill" does not apply until the building achieves passivhaus -level performance.  Anything less is a compromise.  Energy consumed now to save energy indefinitely into the future is a wise investment, although it is one tough sell to a nation that likes to buy lottery tickets.


By the way . . . speaking of dew point, I understand that there is an app available for psychrometric calculations for the iPhone and one on the way for Droid. 

I discovered this comprehensive answer to the design question here:


thanks for all your suggestions!

Yes, the dew point is the issue but also has to do with cold air leakage through cracks around the foam panel joints and windows that ends up creating cold spots inside the wall for potential small spots of condensation inside the wall if inside moisture gets through gaps in the inside vapor barrier. If these are small, I suspect they can completely dry seasonally.

Leo K. PE

I just finished a deep retrofit and used 2" polyisocyurate interiorly firectly over old rock, strapping, new rock.


This site has the best free articles around. 





  • Add Videos
  • View All


Latest Activity

Sam Goode is now a member of Home Energy Pros
16 hours ago
Tina Gleisner commented on Tom White's video

How to Insulate a Tiny House (or a Big Fat House)

"Really like how Corbett tells his story in a simple manner that homeowners should be able to…"
19 hours ago
Tom Mallard commented on Tom White's video

How to Insulate a Tiny House (or a Big Fat House)

"So consider the conduction paths of studs-rafters show quite clearly, to counter this requires…"
20 hours ago
Davide Lanzoni commented on Tom White's video

How to Insulate a Tiny House (or a Big Fat House)

"Very cool the thermal tuning with body in white and glasses in black !"
21 hours ago
Quinn Korzeniecki posted a discussion

Applications for Jon Siemen Scholarship Due by 11/31

Thinking of obtaining a BPI Quality Control Inspector (QCI), Energy Auditor (EA), Crew Leader, or…See More
21 hours ago
Benny hani replied to Benny hani's discussion Manual J online
"Thanks Bob"
Benny hani replied to Benny hani's discussion Manual J online
"Thank you Isaac"
Bob Blanchette commented on Amber Vignieri's blog post Even with Polar Vortex, Hourly Pricing Participants Saved
"Looks like the days of paying a fixed amount per KWh are rapidly coming to an end. Many utilities…"

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service