Knowledge

Structural Backup

The structural backup of the building system is designed to support floor and roof loads and to resist lateral wind loads and seismic movement. The exterior veneer is not structural and is connected to the structural backup via wall ties and transfers some wind load to the backup.

Backup Types

Concrete masonry/Concrete block: Concrete Masonry Unit (CMU) walls are constructed with vertical steel reinforcement bars grouted in the CMU cells. The spacing and size of the bars is dependent on the structural performance requirements of the wall.

Brick masonry: Unreinforced solid brick masonry, 2 wythes or greater, can function as structural backup, although this is a rare construction type. Reinforced brick masonry as structural backup requires a minimum brick size to allow insertion of steel reinforcement and grout.

Reinforced concrete: The connection of the veneer to reinforced concrete can be achieved by veneer ties anchored to the concrete or by a dovetail tie and slot system cast integrally into the concrete wall.

Steel Stud: Steel stud construction is used in conjunction with structural steel or reinforced masonry and is not structural backup itself. Veneer anchors are secured to the backup wall through flashings, water resistive barriers and sheathing directly into steel studs.

Wood Stud: Veneer anchors are secured to the backup wall through flashings, water resistive barriers and sheathing directly into wooden studs.

Performance: Structural, Energy, Sound, Fire