CAT Building 11 was probably little more than a hut dating from c.AD 85 to c.90. It was built over a garden in use since c.AD 49. The building extended beyond the area of excavation on all but the north side where there was a slot and two shallow grooves and probably left by two horizontal wattles in a wall. Apparently inside Building 11, and contemporary with it, was a forging hearth (LF267). The remains of this took the form of a hard, well burnt, flat patch on the floor which was associated with fragments of hammer-scale, forging slag and furnace lining. The pattern of burning showed that the furnace had been in the shape of an irregular circle measuring 0.8 - 1.0m externally. The mouth was on the south-east side and was 0.25m wide. The floor of the furnace had been formed with broken roof tiles laid flat. The furnace had been rebuilt several times, the exact number not being clear. To the south-east were some stake holes, a few of which were square. It is possible that the furnace post dated Building 11 and thus could have been outdoors, however, the occupation around the furnace is thick and consistent with indoor accumulations of this type elsewhere.<1>