Abstract: A light-framed wall structure contains a wall frame of studs, a bottom plate and a single top plate that together define a stud cavity; exterior sheathing attached to the wall frame and covering the stud cavity; and a polyurethane foam within the stud cavity and affixed to the exterior sheathing, studs, bottom plate and top plate.

Abstract: Structural insulation sheathing (SIS), preferably in the form of a panel, comprises a structural facer and an insulation member. The structural facer and insulation members are in intimate, planar contact with one another, both are plastic, and the SIS structure meets both the structural (i.e., ASTM E72) and insulation (R>2) requirements for the North American residential market. The structural facer member of the SIS structure is high-density polyolefin foam. The structural facer comprises a skin/core structure with the skins of a higher density than the core, and the structural facer has a flexural modulus typically of at least about 30,000 pounds per square inch (psi). The insulation member of the SIS is a foamed sheet of thermoplastic, e.g., polyisocyanurate.

Abstract: The present invention provides an engineered closed wall system that includes one or more preinstalled conduits installed during fabrication of the closed wall system and an associated box that is positioned to intersect the preinstalled conduit at a standard connection port of the box and in a predetermined location. The location of the conduit and/or box can vary according to job-specific requirements. Advantageously, the conduit can be installed equidistant from the first and second outward layers. Specific boxes, and any ring extensions mounted to the boxes, can be sized to flexibly mount from either outward layer and still be substantially flush with the face of the outward layer and still intersect the conduit at a standard connection port provided on the box.