Abstract: A stopping for use in improving underground mine ventilation comprising an assembly of wall elements, said wall elements comprising:(a) a plurality of rigid blocks, and(b) a plurality of compliant sealing members. The rigid blocks and compliant sealing members are combined in courses to form a wall which extends over substantially the entire cross section of a tunnel being stopped, the sealing members being interposed between and/or around the rigid blocks in a uniform or nonuniform arrangement throughout the extent of the wall so as to (i) accommodate convergence loads imposed on the wall, and (ii) form, together with the rigid blocks, a barrier against the flow of gas through the tunnel.

Abstract: A building structure comprising a corrugated protective layer having crests and valleys, a plurality of rigid metal securement strips applied over the corrugated protective layer, an outer weather-resistant covering applied over the rigid metal securement strips, and connecting means for securing said building elements together. A layer of insulation may be included between the rigid metal securement strips and exterior weather-resistant covering. The outer weather-resistant covering, the layer of insulation, and the metal securement strips can be secured to the corrugated protective layer without disturbing the preexisting structure.

Abstract: An insulating wall structure for installation over an existing outer wall of a structure comprises an insulating material spaced from said outer wall with a closure means at the bottom and sides of said outer wall and an opening adjacent the top of said insulating wall structure.

Abstract: A novel and highly efficient insulating wall structure for a building comprises a generally closed wall with a top venting structure only. The wall structure generally comprises two substantially moisture and air impervious barriers spaced from each other by intervening framing members, a bottom substantially moisture-and-air impervious closure sealing the bottom of said barriers and a venting structure locating only at the top of said wall to release water vapor from the interior of said wall.