Jointing of building panels and sheets

Improved means for joining together a pair of panels, wherein each of said panels comprises means for nesting with the other of said panels with a complementary interfitting, with said interfitting comprising a frictional engagement between said panels at a plurality of sites and wherein a gap of approximately uniform width and an equidistant spacing between said panels, extends between said panels at the position of their complementary interfitting, said gap is interrupted by said plurality of sites, with said gap being filled with adhesive,

• wherein at least one of the pair of panels comprises a plurality of tongue formations and the other of the pair of panels comprises a plurality of recesses having a shape substantially complementary to said tongue formations, whereby said tongue formations of one panel are receivable in the recesses of the other panel, at least one of said complementary tongue formations and recesses comprises a plurality of integrally formed projections, with said projections being positioned, shaped, and dimensioned such that said tongue formation is frictionally fitted within said complementary recess by virtue of said projections between the tongue formation and the walls of the recess, and wherein opposed facing surfaces of said tongue formation and said walls of the recess are spaced apart so as to form a gap of approximately uniform width which extends between the tongue formation and the walls of the recess, interrupted by said projections.