The discoveries of 2013 have yielded a new understanding of the forms and phases of the baths’ construction; these include five furnaces. They are numbered clockwise, starting with Furnace #1 on the western side of the apse; this was the first discovered, and already identified in 2005. Furnace #2 came to light last season as one of two arched openings in the long north wall of the tepidarium, Wall O. Its opening was blocked up with masonry and concrete to the level of the base of the arch. This probably occurred when Furnace #1 was created. The eastern arched opening in Wall O marks Furnace #3. Here there is a clear opening through the wall into the furnace chamber, which is still buried beneath the northern slope.

East of the tepidarium appeared Furnace #4. Its arch is on the south side, and it thus would have supplied heat to the new east room discovered last year. This furnace, too, has been blocked up. The decommissioning of Furnace #4 would have cut off heat to the new room’s hypocaust and thus turned it into a frigidarium. On the south side of the baths, the new south room also appears to have its own furnace (Furnace #5). This would have extended south from the main structure toward the fossa. This room was also built later and tacked on, and it shows the same hasty composition of reused and miscellaneous fragments as we saw in the apse construction, which suggests that they may be contemporary. The most distinctive feature that they share, however, is a kind of “lining wall,” consisting of tegulae cut in the shape of wall bricks, their raised edges facing away from the wall. These walls form a 20-cm. shelf around the interiors of the walls and may have served as support for the weight of pools.