Due to aesthetics, R-20 (4 1/2 inches of rigid foam) above the roof is my limit
Due to aesthetics, R-20 (4 1/2 inches of rigid foam) above the roof is my limit. Would Roxul plus an airspace in the rafter bays be a good choice for the remainder of the needed R-value?
Jesse, 80% of home is concrete slab with remaining 20% being crawl space I closed in - conditioned basement. In a high water table area with no vapor barrier under slab or crawl. De-humidifier runs constantly.
I plan to include air space in rafter bays under sheathing along with batt insulation for remainder of needed R-value. Is an airspace necessary with R-20 foam above roof sheathing?
Asked by cameron morris
Posted Jul 1, 2014 8:31 AM ET
Edited Jul 1, 2014 9:34 AM ET
Posted Jul 1, 2014 8:31 AM ET
Edited Jul 1, 2014 9:34 AM ET
Technorati
Yahoo
StumbleUpon
Reddit
del.icio.us
Digg
Facebook
GoogleOther Questions in Green building techniques
Foil-faced batt insulation effect on wall construction?
In GBA Pro help | Asked by Michael Kalustov | Feb 27, 15
Insulating a low-slope EPDM roof from the ceiling below
In General questions | Asked by joseph moore | Feb 26, 15
Best way to have a wood fireplace?
In Energy efficiency and durability | Asked by Clara Kim | Feb 22, 15
Converting fiberglass+plastic basement insulation to rigid foam - worth it?
In Energy efficiency and durability | Asked by Jeff Watson | Feb 28, 15
Dense packing cellulose - height of cavity
In General questions | Asked by Graham Fisher | Feb 28, 15
Cameron,
It looks like you intended to post this on a different page. In most cases, it makes sense to maintain just one thread for a series of questions, rather than starting a new thread each time.
Here is a link to the original thread:
http://www.greenbuildingadvisor.com/community/forum/green-building-techn...
It would be a good idea to post all answers back on that page.
Posted Jul 1, 2014 9:36 AM ET