Both the floor, or rather, from the floor, as it is in the Hebrew; for the floor itself was not covered with cedar, but with fir, as it here follows. And the walls of the ceiling, or rather, as it is in the Hebrew, unto the walls of the ceiling, or of the roof, i.e. unto the top of the wall, which was even with the roof; for the roof itself was not of stone, but wood. Or, unto the walls of the ceiling, i.e. unto the ceiling itself; which performing the office of a wall, may well be called by that name. For the name of a wall is not appropriated to stone or brick, because we read of a brasen wall, Jeremiah 15:20, and a wall of iron, Ezekiel 4:3. And that wall into which Saul smote his javelin, 1 Samuel 19:10, seems more probably to be understood of wood than of stone; especially, considering that it was the room where the king used to dine. So by this periphrasis, from the floor of the house unto the walls of the ceiling, he designs all the side walls of the house. He covered them, to wit, the side walls of the house, now mentioned. With wood, i.e. with other kind of wood, even with fir, as appears from 2 Chronicles 3:5, wherewith the floor is here said to be covered. The floor of the house: this is here spoken only concerning the floor, because there was nothing but planks of fir; whereas there was both cedar and fir in the sides of the house, the fir being either put above or upon the cedar, or intermixed with or put between the boards or ribs of cedar, as may be gathered from the said parallel place, 2 Chronicles 3:5.
Related Commentaries of 1 Kings 6:15
1 Kings 6:15
15 And he built the walls of the house within with boards of cedar, both the floor of the house, and the walls of the cieling: and he covered them on the inside with wood, and covered the floor of the house with planks of fir.