Can anyone point me to a (dream?) resource listing effective R-values of various wall assemblies? We are trying to find a cost-effective R-40 wall assembly for a one and two story public middle school targeting net zero energy in Oregon. Referencing Seonhee's "thermal bridging" thread in late April, I used Therm's native drawing feature, but the 2D nature of this tool seems limited. I tested our initial idea for 2x8 wood studs (advanced framing) at 24" on center, with mineral batt in the cavity; and GreenGirts (or similar Cascadia Clip/Knight Wall, etc.) with 2 inches of exterior mineral board. We are considering a combination of brick veneer, metal panel and/or other economical, yet durable cladding systems.
We are trying to limit the rainscreen depth, because our initial assumption is that using 4 to 6 inches of exterior insulation will add lots of cost to the cladding and window support.
From my first attempt in Therm (attached) I'm afraid my detail (in their 2D format) shows the GreenGirt furring running vertical, aligned with the vertical studs, rather than horizontally (perpendicular to the studs) which should make a big difference.
- Does the Rhino/Honeybee approach allow for 3D thermal analysis, that could better account for perpendicular furring?
- Any additional suggestions for cost-effective R-40 wall assemblies would be greatly appreciated.
Thanks for your help,
Stephen
