TIGERISS, the Trans-Iron Galactic Element Recorder for the International Space Station, is an Ultra-Heavy Galactic Cosmic Ray (UHGCR) detector that is planned to be launched to the ISS in 2026. TIGERISS is a continuation of the TIGER and SuperTIGER mission heritage that will be able to measure the elemental abundances from $_5$B to $_{82}$Pb that exceed an energy threshold of 350 MeV/nucleon for an acrylic Cherenkov detector used on the instrument.. With a minimum geometry factor of 1.3 m$^{2}$ sr, TIGERISS, in less than one year of operation, will match the statistics seen by the 55 day SuperTIGER-1 balloon flight without the need for atmospheric corrections. By using SiPMs instead of PMTs, TIGERISS will improve upon SuperTIGER’s charge resolution providing single-element peak resolution over its full dynamic range. All of these factors will allow us to provide the first single-element measurements through the lanthanides and up to lead within the interstellar medium, allowing us to test a wide range of source and propagation models for cosmic-ray origins and acceleration. With TIGERISS being able to cover the entirety of the s-process, r-process, and rp-processes of nucleosynthesis, we will add to the wider multi-messenger effort to determine the relative contributions of supernovae (SN) and Neutron Star Merger (NSM) events.