Mostly wood and stone
roman house wre made from lime stone to bricks to granit for the rich
clay most likely.
There were many bathouses in Rome, both public and private. All of them were located by necessity near a steady source of water.
The rooms of the wealthy were furnished with great splendor. The walls were frescoed with scenes from Greek mythology, landscapes, etc. In the vestibules were fine sculptures, costly marble walls,...
mainly brick