Chapter 11 Verse 3 Revisited

And each one said to his neighbour: Come, let us make brick, and bake them with fire. And they had brick instead of stones, and slime instead of mortar
[Genesis 11:3]

I just learned* they had found plaster at Göbekli Tepe.

To Milo Rossi*, this indicates that there were rooves, which have not been found. Apart from the "slime instead of mortar" possibly being plaster, it is possible that the bitumen was actually used on rooftops.

For the non-baked bricks, the text doesn't state they succeeded in making baked bricks. In Jericho they have found some baked brick in broken pieces that are used to make pavements, from this same time, those could be the failed attempt at baking bricks, and they may have settled for mud bricks instead.
/Hans Georg Lundahl

PS, the 200 pillars would be, over 40 years of Babel, 5 pillars a year, or more. Not like those believing the carbon dates at face value, as they believe any pillar would have been a "multigenerational project"*./HGL

* 10:53 in https://www.youtube.com/watch?v=xJU973IbG7I