The kitties were BANNED from the room during all of this. To keep them from escaping via the non-existent windows, and later to keep their paws and tails out of the not-yet-dry window sealant. They were most miffed.

One of the old windows had developed a minor leak. It only leaked when it rained particularly hard, and the wind simultaneously blew in a certain direction, but still more leakage then one would wish from a window.