One of the most basic ways to prevent mob spawning is by placing torches. ... Mobs cannot spawn on blocks that are less than a full block in height. Areas covered in bottom half slabs will be unable to spawn mobs, no matter the light level, although double slabs, top half slabs and upside down stairs are still spawnable.

Can mobs spawn on slabs 2020?

No, mobs cannot spawn on single slabs.

Can mobs Pathfind on slabs?

Mobs wont pathfind on only slabs when there is a block underneath its fine like in clip 1. When there is a gap they will only pathfind when the blocks underneath them are connected to the blocks they want to go(clip 3).