Just levelling off my last few rooms with sand prior to laying down my EPS/PIR boards. I remember on ebuild someone suggested to me that it wouldn't hurt to sprinkle down some ant powder with the sand. It's probably overkill, but I don't want any ants in there creating a labyrinth of tunnels that may create hollows within the insulation.
FWIW, floor build up:
Bamboo/tiles
Meshed concrete/UFH
EPS/PIR
Radon barrier
EPS
Sand
Hardcore
No issues with ants in the property and removing the old slab, there was no sign of any ants, but I've read of ants making cosy homes within EPS/EPS beads (but mostly where it's been moist).
So if I do use ant powder, is there anything that I should be aware of? I don't want the powder eating away at the EPS!
TIA