Abstract: An insulated roof panel comprising a plurality of longitudinally extending spaced parallel web trusses secured to an inner sheathing and an outer sheathing. Each of the web trusses comprises at least one top cord, a bottom cord and a plurality of webs joining the cords together. A vapor barrier is sandwiched between the bottom cords of the web trusses and the inner sheathing. A layer of insulation extends upwardly from the vapor barrier a height less than the height of the insulated roof panel in order to allow air to flow over the insulation. Sleeves built in to the web trusses allow fasteners of a length less than the height of the panel to secure the roof panel to timber frame members.

Abstract: An asymmetric structural insulated panel for building construction includes a generally planar insulating core such as of plastic foam or wheat-, straw-, or agricultural board. Adhered to a first surface of the insulating core is an outer facing of a conventional building material such as wood, oriented strand board (OSB), gypsum composite or cement. Adhered to a second opposed surface of the insulating core by means of a conventional adhesive is a thin, high strength sheet of paper impregnated with plastic such as polyisocyanurate. The plastic impregnated paper provides a high tensile strength for the structural insulated panel to accommodate large transverse loads on the panel. The panels may be incorporated in conventional stick construction employing 2× dimensional structural lumber members by attaching the panel's outer facing to one side of a 2× structural member after notching out an edge of the panel's insulating core.