Looking through one finished wall at a team from Shirey Contracting, an Issaquah-based remodeler and builder, installing another pre-fabricated structurally insulated panel and nailing it in place on a residential remodel project outside Seattle. SIP's laminate a 6-8" thick layer of strofoam between two OSB boards in pre-made shapes, thus combining framing, sheathing, and insulating into a single step.