Continuing the work begun in previous years, in 2015 a new area between Insulae 4a and 4b of Regio I was excavated with the aim of furthering the investigation of a building partially exposed in 2014 and the sector dividing it from the temple of Tinia in Insula 5.
Several structures and robber trenches were exposed in the eastern sector of the area excavated this season, which together formed the plan of a building divided into three parts. The entire building had been heavily robbed, the materials found in the robber trenches indicating that this occurred in the modern era.

Three surveys were made of the building (orthophoto, 3D survey using Photoscan and video-photography from a drone). All walls were built in loose foundation trenches dug in the natural terrain and in a single construction phase. The robber trenches were also the result of a single intervention, as attested by the fact that the fill was absolutely identical in all of them and there were no elements of discontinuity. The walls were built using the same technique: the bottom 5-6 courses were constituted by medium sized cobbles, on top of which were one or two courses of smaller, flatter cobbles to provide an even surface on which very large cobbles were placed, some large enough to occupy the entire width of the wall. These larger stones probably served to stabilise the walls and strengthen the structure at the point where it began to emerge above ground level. The perimeter structures – given their structural function – were the widest, with an average width of 110 cm from the lowest courses upwards (max. width 130 cm). The interior supporting walls were also a substantial width (up to 105 cm), while the walls that did not support the roof were narrower.
A number of trenches were opened at the corners where the various structures met, in order to check the stratigraphic relationships.

To the west of the building, an area about 7 m long (east to west) was investigated. Three pits for planting vines were uncovered. A complex sequence of interventions was documented, which only the study of the finds will clarify, involving the rebuilding of walls in various phases; the creation of a compact layer of brick/tile fragments mixed with pottery; the construction of a probable craft working structure (a kiln?) that was later dismantled.
Further west, towards the temenos wall of the temple of Tinia in insula 5, two trenches intercepted the large hole, identified and excavated last year, which had removed the original stenopos adjacent to the peripteral temple.