Thanks for the reminder :) Would also need grounding and ideally, continuity across corners and joins. Some photos of metal lath: https://inspectapedia.com/interiors/Plaster_on_Expanded_Meta...

Wouldn't the wire mesh need to be spaced near the size of the wavelength (mm-wave, so the wire mesh is probably way too spaced out)?

Wi-Fi 7 Sensing works at each of the different frequencies (2.4Ghz, 5Ghz, 6Ghz, 60Ghz). The lower frequencies have lower imaging resolution, longer range/penetration and can be blocked with less dense mesh.

EMF shielding materials readily available at hardware stores include insect screening metal mesh and aluminum vapor or radiant barrier. There's also drywall which includes RF shielding, but it's expensive. DIY pointers: https://mpkb.org/home/special/emf/whitezones/faradaycage