There were upon the roof, &c. The roof was flat, and had windows, through which they might see what was done in the lower parts of the house.
Related Commentaries of Judges 16:27
Judges 16:27
27 Now the house was full of men and women; and all the lords of the Philistines were there; and there were upon the roof about three thousand men and women, that beheld while Samson made sport.