The conventional possibilities are foam or Roxul drainboard.  Nether has an easy way of hanging my siding or cladding to match to the above walls.  There are ICF possibilities that address the cladding support but at a $ cost.  Here is my thought, use wood foundation grade treated lumber to make a lattice filled with Roxul comfort bats and cover it with foundation grade plywood.  The inner layer is 2x4 vertical 16" OC standing on the footing, no plate, attached to the concrete with a metal angle at the bottom and top with tapcons.  After the inner layer is filled with bats the 2x4 16" OC horizontal pieces are attached to the verticals with long screws.  The horizontal spaces are filled with another layer of r 15 bats then 3/4" basement grade treated plywood is attached.   After waterproofing it's back filled.  Clear wall r value calculates r28.7.   Cost is about $3.50/sq ft for the materials.

I was not aware that Comfort bats were approved for below grade. Most people here will not even use Roxul Drainboard below grade. Technically it is approved but why use something that porous and assume insulation value?

Wood basements are often insulated with comfort bats. I'm simply adding a non structural (except it still must withstand soil pressure) wood basement outside the poured concrete.

Posted By Liebler on 20 Mar 2013 03:40 PM
Wood basements are often insulated with comfort bats. I'm simply adding a non structural (except it still must withstand soil pressure) wood basement outside the poured concrete.

For sure they are but in this case the new wall must dry through the concrete wall assuming you are not finishing the inside. Also you will need to make sure damp rising from the footings into the wall does not saturate the rozul. If you are finishing the inside, you will have the same problem. You can not coat the concrete or the exterior wall has no place to dry to unless you can build a vent strip into the top at ground level but that would defeat the insulation value.

Not sure where you are located but is the cost of ICF so high there that you can pay for an eight inch concrete wall and this exterior wall?

Drying to the outside is at the top, through the plywood, in all above grade portions of the walls Interior drying is certainly slowed by the concrete but there is definitely still some. This exterior wall's material cost is less than the material cost alone of any foam that will achieve equivalent r value! ICF's always cost well over the foam regardless of where one is. Yes I'll incorporate capillary breaks at the footing interface.

Posted By Liebler on 20 Mar 2013 06:54 PM
Drying to the outside is at the top, through the plywood, in all above grade portions of the walls Interior drying is certainly slowed by the concrete but there is definitely still some. This exterior wall's material cost is less than the material cost alone of any foam that will achieve equivalent r value! ICF's always cost well over the foam regardless of where one is. Yes I'll incorporate capillary breaks at the footing interface.

That interesting! Our basement costs with ICF consistantly come in at between 6 and 9% more than standard 8" cip walls when you add a stud wall, f.f. insulation and a vapour barrier to the cost of the cip for inside finish. If you compare to a foam and roxul inside wall the difference wouldbe less.Maybe its the difference in concrete prices. I pay around $215 per cubic meter for my icf mix and that includes pump and place. We are comparing a 6" core to 8" cip. I know some of my collegues in Ontario claim to install icf at the same price as cip but they are competing with 9" cip wall walls to their 6" core walls.

If I wanted a finished interior, which I do not. Then the higher cost to finish CIP, compared to ICF would help offset the higher cost of ICF.which must be finished with an "ignition barrier". Unfinished CIP has no need for an "ignition barrier", there is no exposed foam.  BTW I used your price for concrete and it'll cost just about twice as much as the materials for the insulating layers.

Posted By Liebler on 20 Mar 2013 08:58 PM
If I wanted a finished interior, which I do not. Then the higher cost to finish CIP, compared to ICF would help offset the higher cost of ICF.which must be finished with an "ignition barrier". Unfinished CIP has no need for an "ignition barrier", there is no exposed foam.  BTW I used your price for concrete and it'll cost just about twice as much as the materials for the insulating layers.

What will cost twice as much?

Should you choose to go this way (and I'm not saying you should ;-)) What if you make the 2x4 wall load bearing and support your outer upper wall on this? Other than some connecting plates, you should get an almost barrier free transition over the rim joist.

The cost of the concrete is 2 times the cost of the insulating layer. Stated another way my completed wall is 150% of the price of the concrete, or the cost of the concrete is 2/3 the cost of all the materials.

What an intriguing thought, support the outer wall from the basement footings! It is a very different design but certainly "doable".