Would using spray on foam as insulation allow me to avoid the need to use any drywall in my exterior walls?
Would using spray on foam as insulation allow me to avoid the need to use any drywall in my exterior walls if I am using tongue and groove wood for interior walls? Also is there any interior treatment that can reduce thermal transfer through the 2x6 studs?
I would like to use tongue and groove pine, spruce or aspen for most of my interior walls. I am building a new home (it is a tall barn home built around a 170 year old barn frame). The exterior is OSB, tyvek, then shiplap spruce or board and batten spruce or 4 inch thick limestone. We did not install any rigid foam boards outside so we have the problem of the 2 by 6 studs acting as a thermal transmitter at least where we have exterior wood siding.
The ceiling of the structure is made of old barn wood, then tar paper, then thick plastic, then a cavity of about 24 inches filled with fiberglass insulation that is between 6 and 18 inches thick (the Ijoists in the ceiling do not act as a thermal bridge because they do not connect with the interior barnwood ceiling, which rests on the old barn wood frame and rafters).
I would like to avoid using any sheetrock due to the mess it may make of the big old hand hewn barn beams and due to the expense. I can get tongue and groove wood cheap at a local mill and paint it with whitewash as an interior finish.
Can I use spray in foam to create an adequate air barrier and then avoid using any sheetrock? Also is there anything I can do on the interior to reduce thermal transfer through the 2x6 studs?
FYI, the barn sits on a large new cement slab (no basement) and so far even with no insulation it stays cool in the summer. we also have cupolas with automatic window openers to allow for venting if the barn heats up. I am mostly worried about winter. This is in Utah at about 6,000 ft.
Posted Jun 30, 2014 12:52 PM ET
Edited Jun 30, 2014 12:59 PM ET
Other Questions in Green building techniques
I need recommendations for the best way to insulate and air seal the walls and floors in in house built in 1977 in the Seattle area.