John Lightfoot on Mark 2:4

[They uncovered the roof, &c.] Here I recollect that phrase the way of the roof: "When Rabh Houna was dead, his bier could not be carried out through the door," the door being too strait; "therefore they thought good to draw it out and let it down through the roof, or through the way of the roof. But Rabh Chasda said to them, 'Behold, we have learned from him that it redounds to the honour of a wise man to be carried out by the door.'"

"It is written, 'And they shall eat within thy gates' (Deut 26:12); that is, when the entrance into the house is by the gate, to except the way through the roof." "Does he enter into the house, using the way through the gate, or using the way through the roof?" The place treats of a house, in the lower part of which the owner dwells; but the upper part, is let out to another. It is asked, what way he must enter who dwells in an upper room, whether by the door and the lower parts, where the owner dwells; or whether he must climb up to the roof by the way to the roof: that is, as the Gloss hath it, "That he ascend without the house by a ladder set against it for entrance into the upper room, and so go into the upper room."

By ladders set up, or perhaps fastened there before, they first draw up the paralytic upon the roof, Luke 5:19. Then seeing there was a door in every roof through which they went up from the lower parts of the house into the roof, and this being too narrow to let down the bed and the sick man in it, they widen that space by pulling off the tiles that lay about it.

Well, having made a hole through the roof, the paralytic is let down into the upper chamber. There Christ sits, and the Pharisees and the doctors of the law with him, and not in the lower parts of the house. For it was customary for them, when they discoursed of the law or religion, to go up into the upper chamber.

"These are the traditions which they taught in the upper chamber of Hananiah, Ben Hezekiah, Ben Garon." "The elders went up into an upper chamber in Jericho. They went up also into an upper chamber in Jabneh." "Rabh Jochanan and his disciples went up to an upper chamber, and read and expounded." Compare Mark 14:15; Acts 1:13, 20:8.