A method covers at least a portion of a surface of an existing structure with a repair structure. The method comprises: providing a standoff, the standoff elongated in a longitudinal direction and operable from an open configuration to a closed configuration; while the standoff is in the open configuration, mounting the standoff to the existing structure, such that the standoff projects outwardly away from the surface of the existing structure; closing the standoff to the closed configuration, the closing of the standoff forming a standoff connector; and coupling a cladding panel to the standoff by engaging the panel with the standoff connector at a location spaced outwardly apart from the surface of the existing structure by a void.

A method covers at least a portion of a surface of an existing structure with a repair structure. The method comprises: providing a standoff, the standoff elongated in a longitudinal direction and operable from an open configuration to a closed configuration; while the standoff is in the open configuration, mounting the standoff to the existing structure, such that the standoff projects outwardly away from the surface of the existing structure; closing the standoff to the closed configuration, the closing of the standoff forming a standoff connector; and coupling a cladding panel to the standoff by engaging the panel with the standoff connector at a location spaced outwardly apart from the surface of the existing structure by a void.

A monolithic corner and/or adapter panel encapsulates one or more panels while maintaining structural integrity and maintain hygienic properties. The corner may securely receive one or more panels and provide flexibility to easily adjust the one or more panels. The corner and/or adapter panel may simplify installation and an ability to adjust connected panels without compromising safety, installation time, and sterility.

Aspects of the present disclosure relate to modular wall systems and methods of installing modular wall systems in hygienic environments. In one aspect, gap cover apparatus are disclosed. In one aspect, backplate arrangements are disclosed. In one aspect, non-progressive installation methods are disclosed. The modular wall systems can eliminate protruding ledges while maintaining structural integrity and hygienic properties.

An underlayment system for a roof structure including underlayment material disposed in covering relation to a roof deck and a plurality of mechanical fasteners disposed and structured to interconnect the underlayment material to the roof deck. Each mechanical fastener includes an outer plate, an under plate and a connector penetrating through both the outer plate and under plate in secured relation to the roof structure. The under plate is disposed and structured to sealing engage the connector penetrating there through. The under plate is further disposed in engagement with an undersurface of said outer plate and beneath and in segregating relation between an outer peripheral edge of the outer plate and the underlayment material.

An underlayment system for a roof structure including underlayment material disposed in covering relation to a roof deck and a plurality of mechanical fasteners disposed and structured to interconnect the underlayment material to the roof deck. Each mechanical fastener includes an outer plate, an under plate and a connector penetrating through both the outer plate and under plate in secured relation to the roof structure. The under plate is disposed and structured to sealing engage the connector penetrating there through. The under plate is further disposed in engagement with an undersurface of said outer plate and beneath and in segregating relation between an outer peripheral edge of the outer plate and the underlayment material.

A housing barrier for concealing fasteners of an aluminum extruded framing with spline groove. A housing is configured to connect to an extruded framing with spline groove. The housing has a first wall, a second wall, and a third wall. The first wall is connected to the second wall. The second wall is connected to the third wall. The first wall and the third wall of the housing are oriented in a parallel orientation forming a u-shaped compartment. At least one wall has a spline groove and a protrusion. The spline groove is located on an outer side of the wall and the protrusion is located on an inner side of the wall. The protrusion is located on an opposite side of the wall having the spline groove of the housing. The protrusion is configured to interlock with the spline groove of the extruded framing.

A housing barrier for concealing fasteners of an aluminum extruded framing with spline groove. A housing is configured to connect to an extruded framing with spline groove. The housing has a first wall, a second wall, and a third wall. The first wall is connected to the second wall. The second wall is connected to the third wall. The first wall and the third wall of the housing are oriented in a parallel orientation forming a u-shaped compartment. At least one wall has a spline groove and a protrusion. The spline groove is located on an outer side of the wall and the protrusion is located on an inner side of the wall. The protrusion is located on an opposite side of the wall having the spline groove of the housing. The protrusion is configured to interlock with the spline groove of the extruded framing.

A housing barrier for concealing fasteners of an aluminum extruded framing with spline groove. A housing is configured to connect to an extruded framing with spline groove. The housing has a first wall, a second wall, and a third wall. The first wall is connected to the second wall. The second wall is connected to the third wall. The first wall and the third wall of the housing are oriented in a parallel orientation forming a u-shaped compartment. At least one wall has a spline groove and a protrusion. The spline groove is located on an outer side of the wall and the protrusion is located on an inner side of the wall. The protrusion is located on an opposite side of the wall having the spline groove of the housing. The protrusion is configured to interlock with the spline groove of the extruded framing.

A housing barrier for concealing fasteners of an aluminum extruded framing with spline groove. A housing is configured to connect to an extruded framing with spline groove. The housing has a first wall, a second wall, and a third wall. The first wall is connected to the second wall. The second wall is connected to the third wall. The first wall and the third wall of the housing are oriented in a parallel orientation forming a u-shaped compartment. At least one wall has a spline groove and a protrusion. The spline groove is located on an outer side of the wall and the protrusion is located on an inner side of the wall. The protrusion is located on an opposite side of the wall having the spline groove of the housing. The protrusion is configured to interlock with the spline groove of the extruded framing.