Abstract: An improved wall cavity drain panel and wall cavity structure includes a grooved insulating panel with a water-permeable fabric over the grooved face and a water permeable matrix on the fabric at its lower edge and defining a mortar cath trough to prevent weep hole clogging.

Abstract: A wall panel and joint structure for erecting structurally sound, thermally efficient and inexpensive structures for human habitat. Each wall panel includes a foam core faced on each side with reinforced cementitious facing panels, the foam edges of the composite panel being grooved peripherally inside the cementitious facing panels. At least one metal tongue member is inserted in opposing side edge grooves of abutting wall panels, and fasteners are mounted through the cementitious facing panels, any intervening foam, and into the tongue members to hold adjacent wall panels together. U-shaped channels are provided to finish an upper edge of the wall panel and to secure a bottom edge thereof to a floor structure. Wall mount clips are provided to secure the wall panels to existing subwall structures. Flanges are provided at an upper end of the tongue members to secure roofing members to the wall panels.