I live in Michigan. Hopefully we will relocate to the Upper Penninsula in the next few years. I am Interested in Enercept Basement SIPS as a possibility. I know all about icf's and Superior Walls but I would like to hear from someone who has used Enercepts system.

Enercept is a good company and make quality SIPs that are great for roofs, but for walls use ICFs, especially a basement where you need the strength to support back-fill pressures.

You may consider cement board skin SIPs. Make sure to use structural grade cement board.

The following is a link to ARMOROC cement board as SIP skin.

https://www.yousendit.com/transfer.php?action=batch_download&batch_id=M3BuQ1ZuTmFRWUs1aWNUQw

I did not see on their web site where they are approved for below grade use?