Insulation under siding

Tom,
I renently purcahsed a Home that was a foreclosure. The home is a large
( 3,000) sq ft. post and beam under construction. The shell has been
completed. The exterior sheathing is on, but no siding. The framing is
2 X 4 walls. there is no wiring , heating, etc.. in walls at this
point. My question is what would yo recommend for insulating the
exterior walls to obtain the proper "R" Factor.
Edwin

Hi Edwin,
I would recommend a minimum of R-30 for the walls. This can be done with
fiberglass in the walls and then 2" of polyisocyanurate foam over the
exterior, before the siding.
More is better, but this is my minimum.
Tom