Wall structures

A wall structure comprising a series of frame members forming a plurality of cells or spaces in said structure, multiple-layered infill panels for dividing an interior space from an exterior space, said panels being held in said cells, each panel comprising a pair of panels with an air space between said layers, peripheral regions of said panels and said cells being adjacent each other, and sealing means engaging the panels and the frame members in order to seal between said peripheral regions of the panels and cells, said sealing means comprising a respective flexible sealing member or gasket for each panel in the form of a closed loop extending around the peripheral region of the panel, the cross-section of the sealing member comprising forward and rearward portions that overlap and seal against the forward and rearward margins of said peripheral region of the panel, and a thin web connecting said forward and rearward portions and providing therewith an enclosed space that extends around the periphery of the panel, said periphery having a lower portion whereat the panel rests, via hollow spacer means, upon an associated peripheral extent of the web, said hollow spacer means being interposed between the panel and the web at said lower portion to maintain continuity of said enclosed space therealong, and connection means from the exterior to said enclosed space for the application of gas pressure to said space, whereby to test the integrity of the peripheral seal between the associated gasket and its panel.