Sweathouses, known in Irish as tigh alluis, were a form of indigenous sauna used across Ulster and Connacht for centuries, most commonly for treating rheumatism and other joint ailments. A fire would be lit inside, the chamber heated thoroughly, the embers cleared out, and the patient installed within on a bed of rushes, the low entrance sealed behind them. This particular example in Corraquigley is easy to overlook, absent as it is from the Ordnance Survey maps of both 1836 and 1876, which suggests it had already fallen out of active use or local prominence by the time the Victorian surveyors came through.

The structure itself is a careful piece of vernacular stonework. Circular in plan with an internal diameter of 2.4 metres and standing 1.8 metres high, it is built in a beehive style, meaning the walls corbel inward toward the top, with three large flat slabs forming the roof. The outer face of the wall is dressed stone, laid in an alternating pattern of headers and stretchers, where headers are stones placed with their longest axis running into the wall, and stretchers run parallel to the face. This gives the exterior a considered, almost formal appearance that belies the simplicity of its function. The entrance faces east and is low and lintelled, only 0.6 metres high and 0.5 metres wide, the kind of opening that requires a deliberate stoop, which would also have helped retain heat inside. The construction details were noted by Richardson in 1939, suggesting the structure was recognisable and largely intact at that point.

The site lies 85 metres east of a local stream, a proximity that was almost certainly practical. After the heat of the chamber, users would typically plunge into cold water nearby, a routine that followed the same logic as a Finnish sauna. That combination of fire-heated stone and cold running water, repeated across dozens of similar structures in Cavan and the surrounding counties, points to a coherent tradition of community health practice that operated entirely outside formal medical institutions.