Architectural · A-G98N6

Terrazzo Floor Seismic Expansion Joint

Materials

Concrete Masonry / CMU

Elements

Floors / Slabs Expansion / Control Joints Waterproofing / Flashing Insulation Reinforcing

Connections

Expansion / Slip Connection

About this detail

A 2-inch seismic expansion joint assembly integrates into a terrazzo floor system over a concrete slab. The joint features 2-inch by 3-inch by 3/8-inch metal edge angles attached with minimum 3/8-inch expansion bolts at 18 inches on center, maintaining a 2-1/2-inch edge clearance. Non-shrink grout is placed on each side of the expansion joint beneath a terrazzo underbed containing welded wire fabric mesh and an isolation membrane, finished with a 1/2-inch terrazzo floor finish. An elastomeric seal and aluminum spacer bars bridge the 2-inch joint width. Below the slab, rated fire safing insulation is supported by metal support bars spaced at 12 inches on center inside a metal support bar box, with 2-inch wide support straps at 24 inches on center attached to the concrete slab using a minimum of two 3/16-inch powder-driven fasteners. The assembly achieves a 3-hour fire rating with WHI-WB/EJH 180-02 or equivalent.

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