[2] It is installed as a foam with a consistency like shaving cream,[2] or as pre-cast slabs.
[2] Unlike many foam-in-place polyurethane foams, it is nonflammable and non-toxic.
[2] As it is water-based, it offgasses water vapour while curing, requiring ventilation and in some cases a dehumidifier.
Structurally, it does not resemble concrete; at the low densities that make it well-insulating, it is quite fragile.
It can be crumbled away to re-expose wiring or pipes, making a pile of grey powder.