Armstrong Ceiling Systems has introduced the Seismic RxSuspension System, a seismic code-compliant system that allows for the use of 7/8-inch molding and eliminates stabilizer bars in Category D, E and F installations.

In Category C installations, the new system eliminates the installation hassles of free-floating ceiling conditions by allowing for positive attachment to the perimeter. The system's compliance with International Building Code seismic ceiling requirements is evidenced in ESR-1308 issued by the International Code Council Evaluation Service. A nonprofit, public-benefit corporation, ICC-ES is the country's leading organization in evaluating building products, components, methods and materials for code compliance.

The new Seismic Rx Suspension System addresses several installation challenges created by IBC requirements. For example, in Category D, E and F seismic installations, the IBC requires 2-inch wide wall molding at the perimeter and the use of stabilizer bars or some other method to prevent the grid's cut ends from spreading along the molding. The new system allows for the use of 7/8-inch molding instead of 2-inch molding. In terms of installation, 7/8-inch molding does not deflect and distort its shape as easily as the horizontal leg on 2-inch molding. The system also eliminates the costly stabilizer bars.

Similarly, in Category C seismic installations, the IBC requires that grid at the perimeter must not be attached to the wall molding and that stabilizer bars or some other method be used to prevent the grid's cut ends from spreading along the molding. The new Seismic Rx Suspension System eliminates the stabilizer bars and allows the grid to simply be cut tight on two adjoining walls. This enables contractors to easily square up the grid assembly.

The evidence of seismic code compliance contained in ICC-ES ESR-1308 pertains only to the Armstrong Seismic Rx Suspension System.