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.
Thanks

Views: 93

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.

Scott

Scott

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

 

http://www.buildingscience.com/documents/reports/rr-1012-residentia...

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:

http://www.greenbuildingadvisor.com/blogs/dept/musings/calculating-...

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. 

 

http://www.buildingscience.com/documents/information-sheets/high-r-...

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Jason Szumlanski posted a blog post
1 hour ago
Andrew Schnizel posted a blog post

Energy shortage and HVAC business in Canada!!

Being a country of highest life expectancy, how much self reliant is Canada in power sector??? HVAC…See More
2 hours ago
Jennifer Stutzman commented on James P. Weingardt's photo
Thumbnail

Can anyone see what is going on here?

"Was there any dampness? Did the cable guy drill a hole all the way through the exterior wall…"
3 hours ago
Jennifer Stutzman commented on Michael Dunseith's photo
Thumbnail

WT*

"Beer can radiator?"
3 hours ago
Profile IconAndrew Schnizel, Tyrone Fagin, Navin Kumar and 3 more joined Home Energy Pros
3 hours ago
Scott Stubbs added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Retrotec Commercial & Residential Blower Doors $4800

My business no longer has the need for my Retrotec blower door equipment so I am selling both the…See More
20 hours ago
Chris Stratton replied to Linda Wigington's discussion Weigh in - Honorable Mention? 2nd Base? Half-Way There? 50% Better? On the Path? in the group 1000 Home Challenge
"I like that idea. Giving people as many options to engage as possible (without overwhelming them)…"
23 hours ago
Colin Genge posted an event

Duct Testing 101 Webinar at Online

July 2, 2015 from 1pm to 2pm
•Testing for Energy Code or envelope performance •Measure a known hole to prove to yourself you and…See More
23 hours ago

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service