I recently came across this cover art while reading through The Other Lost Missions: Rare Clone Wars Comics and Literature, Part 2, and I couldn't help but notice the way the guy in the picture, Telloti, is holding his lightsaber. It appears he's holding it against the ground, with his left arm being supported by it. True, we can't actually see the blade touching the ground, but I can't think of a good reason why anyone would hold their sword like that while keeping it in the air.
So is it possible for (activated) lightsabers to not pierce through things, and actually support weight like this?
I suppose it's also true that the floor could be resistant to lightsaber blades, but as far as I know, all the materials that can deflect lightsabers are extremely rare and expensive, and would likely not be used in construction of a building of any size.