 He says a certified passive house consumes 20% of the energy used by a conventional code-built home. So the components to build a home are essentially the same between a code-built house and a passive house. It's just how much of it is there. So we're still building the walls out of 2x4 or 2x6 wood studs. We're still applying drywall to the inside of the home. The construction methods are essentially the same. What we've done is we have just increased the amount of insulation within those assemblies.