Holddown for Seismic Retrofit
Seismic retrofit is a means of strengthening the supports of a structure by anchoring the base to the foundation by means of bolting. The brick wall in the photo is unreinforced masonry, which is vulnerable in earthquakes. We first shored up the wall for stability, similar to scaffolding, while we worked. In the photo you see the underside of a floor. The triangular metal brackets are holddowns that are bolted and epoxied to the floor and wall studs. The epoxy method creates a more durable bond than bolts alone.