Abstract: A structural insulated panel is composed of a structural member in a corrugated form and a cohering, insulating filler material. The structural member has a plurality of front surfaces spaced laterally apart from each other and a plurality of back surfaces spaced laterally apart from each other and spaced apart in depth from the front surfaces. The structural member has a plurality of chord panels which span between corresponding edges of respective pairs of the front surfaces and the back surfaces. Chase channels are formed between adjacent pairs of the cord panels and one of the front surfaces or one of the back surfaces. Each chord panel defines a plurality of apertures. The filler material fills the chase channels, binds to the front surfaces, back surfaces, and chord panels, and extends through the apertures in each of the cord panels to structurally connect the filler material in adjacent chase channels.