lhfarm
Veteran Member
I would call the "horizontal 2x4's" blocking. In some cases blocking at certain locations is required by code, for example several bays each side of a corner. In this case this blocking can be called a nailer. I did the same on my garage, it is 30 x 40, framed with 2x6. I put a 2x6 every 16 inches in between the studs to act as a nailer for my vertical pine siding, makes for a very stiff structure. To insulate, I simply used R-19 unfaced (2x6's) with 6 mil poly on top and then GWB, the ceiling I used R-30, 6 mil and GWB.
If I did my house and garage over today I would spray it with the expanding spray in insulation, maybe, I looked at doing 4 years ago when I built my house and it was prohibitively expensive, I couldn't imagine a payback, but that is when oil was $1.50 and appeared stable.
When it was built, I was told that they where nailers, required for the style of siding. I'm going to check for local companies that do foam.