Structural insulated panel system

An insulated enclosure comprising:

• a plurality of walls, each of the plurality of walls comprising a plurality of structural insulated panels joined at joints, each of the plurality of structural insulated panels comprising a frame having a first vertical frame member defining on an outwardly disposed surface thereof a plurality of vertical recesses and a plurality of vertical projections, a second vertical frame member defining on an outwardly disposed surface thereof a plurality of vertical recesses and a plurality of vertical projections, a top frame member, a bottom frame member, and siding members disposed on opposing sides of the frame to define a cavity therebetween;
• wherein the joints joining the plurality of structural insulated panels are butyl-free and comprise butyl-free compressible seals disposed between opposing recesses and projections in adjoining structural insulated panels,
• wherein insulation is disposed both within the structural insulated panels and within at least a portion of at least one structural insulated panel vertical frame member, and
• wherein the structural insulated panel vertical frame members comprise a plurality of voids extending longitudinally along the frame members and having an opening facing the cavity.