Foot Washing - Required for salvation?

Jesus said to Peter that his feet must be washed to "have part with Jesus" (John 13:9). Jesus also commanded all disciples to wash each other's feet (John 13:14). Our church practices foot washing as a sacrament (must do to be saved). I know that we are probably the only church that treats foot washing this seriously. How do other churches approach the subject of foot washing and is it taken as seriously as our church?