These remains of wall coverings are specifically part of the porticoed area of the natatio that was in the open air. It served to camouflage the structures with a noble or decorative material. In the Augustan period, the intense exploitation of marble allowed the cutting of thin and sawn plates, this made the most refined decorations more affordable.

Marble is a material that facilitates waterproofing, the hygiene of some areas and favors the feeling of warmth. The beauty of marble when polished makes it an especially advisable material for a space as particular as public bathrooms. In the Caesaraugusta baths, marble from the French Pyrenees is used, specifically from the Saint Béat quarry. This marble, once the baths were no longer used, was used for other buildings.