The mound measured twelve metres by five, an unassuming heap of scorched material that had been accumulating, undisturbed, for a very long time before a construction project finally brought it to light.

A fulacht fia, sometimes called a burnt mound, is one of the most common prehistoric monument types in Ireland, yet the purpose of these sites is still quietly debated among archaeologists. The conventional explanation is that they functioned as cooking places: water was heated in a trough by dropping fire-heated stones into it, and the discarded, shattered stones built up into the characteristic mound over time. At Ballydowny, excavation in 2002 revealed the classic arrangement beneath the mound, a rectangular trough and a hearth measuring roughly 1.6 metres by 1.4 metres, along with three pits dug close by. A further isolated pit was identified approximately twenty-five metres to the north-east, separated from the main cluster but likely connected to the same episode of activity. The excavation was carried out ahead of housing construction, a circumstance that is itself quietly telling; a great many of Ireland's fulachta fia have come to light not through targeted research but through the practical business of building roads, estates, and infrastructure.