The Trans-Iron Galactic Element Recorder for the International Space Station (TIGERISS) is
under construction and is planned for launch in 2027 and will be attached at the SOX location
on the Columbus module on the ISS. TIGERISS will make the first definitive measurements of
Ultra-Heavy Galactic Cosmic Rays (UHGCRs; Z >29) on an individual element basis past barium
($^{56}Ba$), through the lanthinides, and to lead ($^{82}Pb$). TIGERISS has a geometry factor of 1.06
$m^2$ sr and is comprised of four planes of single-sided silicon strip detectors (SSDs) arranged in
orthogonal X-Y layers with an X-Y pair above and an X-Y pair below two large-area Cherenkov
detectors. The top Cherenkov detector is comprised of a mosaic of aerogel radiators (n =1.05)
while the bottom Cherenkov detector has an acrylic radiator (n = 1.49). The combination of the
Cherenkov velocity measurements with the precise measurements of the ionization and trajectory
of the traversing cosmic rays leads to highly accurate charge measurements of < 0.25 c.u. over the
entire elemental range of $^{5}B$ through $^{82}Pb$. These TIGERISS measurements are highly sensitive
in determining the strength of s-process, r-process, and rp-processes of Galactic nucleosynthesis
while providing critical data needed for multi-messenger studies to determine the contributions
of extreme phenomena, including supernovae (SN) and Neutron Star Mergers (NSMs), in the
production of galactic matter. The science goals of TIGERISS, mission status, instrument design
and performance of the TIGERISS SSD subsystem in relation to the measurements and science
goals of TIGERISS are discussed in this paper.