provide a good friction fit a particularly preferred connector is a foldable connector such as that disclosed in u s design pat no 383 373 u s pat no 4 706 429 u s pat no 4 730 422 and u s pat no 4 885 888 the relevant teachings of the four patents are incorporated herein by reference by using such connectors one can assemble the insulated wall form of the present invention and then collapse or fold it about the connectors into a flattened configuration for shipping or transport when ready for use at a job site one can simply unfold it about the connectors and set it into place 0027 fig4 shows an alternate preferred embodiment of a panel segment designated by reference numeral 20 u2032 panel segment 20 u2032 differs from panel segment 20 in that outer layer 25 u2032 has no slots defined therein whereas outer layer 25 has slots 27 defined therein like segment 20 segment 20 u2032 is a laminar structure that includes inner layer 21 u2032 and outer layer 25 u2032 inner layer 21 u2032 has an inner surface 22 u2032 and a spaced apart generally parallel outer surface 23 u2032 inner layer 21 u2032 also has defined therein a plurality of passageways 24 u2032 that intersect and are in fluid communication with both the inner surface 22 u2032 and the outer surface 23 u2032 passageways 24 u2032 preferably have a t shape similar to.