The GreenBuild Homes have been insulated…again! We already saw insulation installed under the floor slabs and on the wall sheathing, but now the homes have insulation in the wall cavities. On Thursday, damp cellulose insulation was sprayed into the wall cavities to add even more thermal comfort to the homes; this, along with the 1.5″ of polyisocyanurate insulation attached to the ZIP sheathing brings the total wall insulation to R-29–that’s nearly 50% more than a code-built home! While the homes are under construction, we’ve been using them to teach students about high-performance home design and construction. Over the past several weeks, we have taken many students from this year’s Penn State Race to Zero team to walk through the homes and see the physical design and construction so that they can better understand all of the complex systems that go into high-performance homes.