Simpson Redesigns Foundation Seismic Retrofit Plates

Originally published by: Simpson Strong-TieMarch 2, 2017

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To make it easier for contractors to secure older homes to their foundations, Simpson Strong-Tie has launched two next-generation foundation plates that provide higher strength than before, giving installers greater spacing flexibility when attaching first-floor framing to the foundation.

URFP - FRFPThe URFP and FRFP foundation plates are specifically designed for locations with limited vertical clearance, in basement areas or crawl spaces, where floors are supported directly on the mudsill or a short cripple wall.

The URFP, a new and improved version of the UFP plate, now offers higher strength, serving as a one-for-one replacement for half-inch (1/2") or five-eighths-inch (5/8") diameter mudsill anchor bolts. The URFP fits a variety of foundation types and mudsill offsets and insets – ranging from two and one-half inches (2 1/2") to one-half inch (1/2").

The FRFP is the improved replacement for the FAP. The new design offers higher loads and is ideal where the mudsill is flush to the inside of the foundation (or up to 1 1/2" set back). In addition to the three prescriptive sill plate fastener holes, there are now two optional fastener holes which, when filled, provide increased loads and greater spacing options. With all five holes filled, the FRFP is a one-for-one replacement for 5/8" anchor bolts.

In recent years, FEMA, regulating bodies (like the ICC) and even local jurisdictions have increased awareness of the need for seismic retrofit construction to improve the safety of older homes and buildings in areas that vulnerable to seismic activity. Seismic retrofits help bring older homes closer to the current building codes in earthquake-prone regions.

"The new URFP and FRFP foundation plates make it possible to secure first-floor framing to the foundation," said Sam Hensen, general manager and vice president of Connectors. "The new design increases the load values of the retrofit plates to match the strength of anchor bolts, allowing contractors to have a great solution for increasing the safety of at-risk homes in seismic areas, where tight spaces prevent them from installing bolts."

For more information about the URFP and FRFP retrofit foundation plates, visit

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