Structural · S-W5ZNS

Typical Lap Splice - Masonry

Materials

Steel Masonry / CMU

Elements

Beams Walls Roofs Arches Expansion / Control Joints Reinforcing Roof / Floor Openings

Connections

Rebar Splice / Development Expansion / Slip Connection

About this detail

An expansion joint in a concrete masonry unit wall features horizontal bond beam termination and movement accommodation. Horizontal bond beam steel is stopped at the joint except at the roof diaphragm. Two 1/2-inch diameter by four-foot-long smooth bars are provided at each bond beam with capped ends to allow one inch of movement, accompanied by wire tie bars with grease on one side of the joint and an expansion joint strip per architectural specifications. Two number 4 vertical bars are placed on each side of the joint, backed by a backer rod and sealant. General notes mandate that the joint must not be installed in lintels or within four feet of openings, and locations must be coordinated with architectural drawings. Additionally, a masonry lap splice schedule provides required development lengths in inches for bar sizes number 3 through number 9 across masonry compressive strengths of 1500, 2000, and 2500 PSI, with a note specifying that when two different bar sizes are spliced, the lap length of the smaller bar shall be used.

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