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Latitude: 51.546 / 51°32'45"N
Longitude: -3.396 / 3°23'45"W
OS Eastings: 303293
OS Northings: 183930
OS Grid: ST032839
Mapcode National: GBR HN.FSLC
Mapcode Global: VH6DX.3D1Q
Entry Name: Hay barn at Ynysmaerdy Farm (former winding engine house of Llantrisant Colliery)
Listing Date: 7 October 1994
Last Amended: 14 November 2000
Source ID: 15838
Building Class: Agriculture and Subsistence
Location: Located to the E of Ynysmaerdy farmhouse.
County: Rhondda Cynon Taff
Traditional County: Glamorgan
Llantrisant or Ynysmaerdy Colliery was established by the Powell Duffryn Steam Coal Company after World War I. It closed in 1942 following an underground explosion. It was constructed on the efficient modern model developed by the Powell Duffryn Company, with a single engine hall containing the main power equipment needed on the surface. The site is a particularly complete and impressive colliery complex, containing the engine hall, workshops and stores, ruined offices, a separate winding engine house, railway lines, tips, a long revetment wall, a reservoir, and an explosives store. It was associated with the planned housing estate at Ynysmaerdy.
The hay barn was formerly a winding engine house and may have housed additional power equipment, perhaps for electricity generation.
A gabled structure of rubble sandstone with red brick dressings and a corrugated iron roof. It is built into sloping ground, with 2 storeys to the E and one to the W, and is 4 bays to front and back and 3 to the gable ends. The windows have segmental heads with deep, stepped surrounds and pronounced keystones, all in red brick, in typical Powell Duffryn house style. Red brick has also been used for the quoins, a deep eaves cornice, and a string course at the main floor level. The engine house faced the former shaft on the E side, where the bay L of centre has 2 smaller openings to the upper floor, one of which is offset, to carry winding cables, and 2 to the semi-basement level. The W elevation has large, equally placed windows. The gable ends have ventilator oculi with 4 stressed voussoirs and wooden louvres, central doorways flanked by windows, and single windows to the semi-basement. (The S gable end was overgrown with vegetation at the time of inspection.)
The interior has wrought iron roof trusses, concrete floors with steel beams and a core wall to support the winding engine. There are remains of plasterwork in the former engine room.
Listed as a fine example of an inter-war winding engine house, and for group value in this unusually complete and impressive colliery complex.
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