From RimWorld Wiki
This page complements the cover page to help minimize confusion.
The following things DO NOT work as cover! they DO NOT give a higher miss chance, even if you might think it should, so stay away from them when you are being attacked.
- All Plants, except for the Saguaro cactus and Bushes
- Growing area, filed or empty doesn't mater.
- Dumping area empty or with bodies, (rocks works)
- Stockpile area
- Dead bodies
- Power conduit
- Blasting charges
- Sleeping spot
- any kind of floor or carpet
- Graves No cover regardless as to whether it is filled or empty and what side the creature is standing beside
- Drop beacon Can be walked over with no penalty to speed and provides no cover
- Standing_lamp Is not passable by drafted colonists, though it provides no cover
- Sun lamp Is not passable by drafted colonists, though it provides no cover