Interlocking insulative panel construction

A pair of interlocking, insulative panels comprising:

• A. a first panel including:
• i. an inner and outer metallized skin;
• ii. a high density urethane perimeter having sides, top and bottom secured by said inner and outer metallized skin;
• iii. a four inch thick core of low density insulating urethane of closed cell foam prepared by a froth foaming technique, interposed between said inner and outer skins and abutting and bonded to said densified urethane perimeter, and
• iv. a vertically extending tongue defined in a side of said first panel perimeter and limited by a complementary tongue defined in said densified perimeter top and bottom;
• B. a second panel including:
• i. an inner and outer metallized skin;
• ii. a high density urethane perimeter having sides, top and bottom secured by said inner and outer metallized skin;
• iii. a four inch thick core of low density insulating urethane of closed cell foam prepared by a froth forming technique interposed between said inner and outer skins and abutting and bonded to said densified urethane perimeter, and
• iv. a vertically extending groove defined in one side of said second panel perimeter, and limited by a complementary tongue defined in said densified perimeter top and bottom panel, such that said vertically extending groove is complementally engagable with said vertically extending tongue defined in said first panel;
• C. locking means in the form of a cam pivotally supported in said first panel perimeter adjacent said tongue, and engagable with a locking pin supported within said second panel adjacent said groove so as to lock said panels together, and
• D. vertically extending sealing gaskets mounted on either side of said vertically extending tongue defined in a side of said first panel perimeter, so as to engage sealingly the abutting vertical surface of said second panel.