I'm curious if there is a form of Structural Insulated Panel that is a little more environmentally friendly than the urethane or polystyrene foam insulation versions.

SIPs are great in that they are easy to install, can receive any exterior finish (e.g., stone, wood shingles, etc.). However, I'm interested in something a little more friendly to the environment, something that can be safely disposed of when its time to replace it, and preferably something that utilizes local resources.

I've looked into straw bale, and am not convinced that they are a good option for our climate (Nova Scotia, Canada). Just curious to see what else (if anything) is out there.

Mark Gillis