Domical building structure

A domed structure comprising a base perimeter foundation and a dome positioned thereupon, said dome being comprised of a plurality of triangular panels having a flat outer face and having adjacent each side a flat abutment surface having therein continuous interengaging means in the form of a groove or projection uniformly extending substantially the full length of said side and adapted to insertively mate with a corresponding projection or groove respectively associated with the side of an adjacently positioned interengaged panel in a manner to prevent motion of the interengaged panels in directions perpendicular thereto, said abutment surfaces being disposed below said outer face forming an angle therewith of between about 78.degree. and 86.degree., the thickness and composition of said panels being selected so as to provide rigidity and thermal barrier characteristics while minimizing weight, and one triangular panel intended for positioning generally adjacent the uppermost portion of said dome as the last panel in the construction thereof, said last panel having interengaging means which do not require insertive mating and being otherwise identical to said plurality of panels, said base perimeter foundation being comprised of a plurality of footings of two different styles, each footing having two opposed straight segments, the length of each segment being half the length of a side of at least some of the panels, the upper portion of each segment being provided with interengaging means of the same general nature as employed in said plurality of panels, the configuration of interengaging means on one segment being the complementary mating configuration of interengaging means of the opposite segment of each footing, the two styles of footings having opposite arrangements of interengaging means in each segment such that, when placed in alternating end to end coplanar abutment to form a closed polygonal perimeter, the footings provide a series of interengaging means of alternating configuration adapted to receive sides of said panels in a manner whereby each side of said panels spans two segments of adjacent footings.