The foundation walls were set today (see the video in the link below). We design many homes with precast walls. These walls work perfect for many applications and meet today’s stringent energy codes. The XI walls that are used on this house have foam insulation with a value of R-12.5. These walls come in several heights — 8-foot- , 9-foot- and 10-foot-high walls. For more information, check out Superior Walls website through this link http://superiorwalls.com/.