The bottom floor was five cubits wide, the middle floor six cubits, and the third floor seven cubits. He also placed offset ledges around the outside of the temple, so that nothing would be inserted into its walls.
KJV
The nethermost chamber [was] five cubits broad, and the middle [was] six cubits broad, and the third [was] seven cubits broad: for without [in the wall] of the house he made narrowed rests round about, that [the beams] should not be fastened in the walls of the house.
ASV
The nethermost story was five cubits broad, and the middle was six cubits broad, and the third was seven cubits broad; for on the outside he made offsets in the wall of the house round about, that the beams should not have hold in the walls of the house.