Ysgubor-y-Glyn (adjacent to Capel Curig Training Camp).

This is a nine-bay barn situated adjacent to Capel Curig Training Camp. The walls are constructed of rubble stone, with some long, split shale quoins. The roof is of slate, with ventilators in the eastern part, which has a cat-slide form to the north over a lean-to cowshed. This cowshed begins in line with the third truss from the west and is contemporary with the remains of a porch to the main entry. Prior to the raising of the walls and the addition of the lean-to, both sides of the barn were timber-framed. Corrugated iron now covers areas that remained timber-framed after these later alterations; the original wattle and daub panels no longer survive. Originally, barn doors were positioned opposite each other in the third bay, and there is a further door high up on the south side. The lean-to has four openings, while the rebuilt east gable end has slit vents; it is partly boarded above the end truss and contains a central loft door. Slit vents are also present in the west gable, although only one is visible externally.

The barn has eight trusses, six of which are cruck trusses of notably varied shapes, and are not formed of matching blades. This suggests the possibility that the building is constructed of reused timbers or was reassembled at a later date, although detailed examination has not conclusively supported either of these theories. Joints in the walls and wall-plates indicate the end of the earlier construction phase. The second and third trusses have modern concrete footings, and the tie-beam to the second truss and the purlins at this end have been renewed. Trusses to the east of the entrance have more pronounced elbows, one with a vertical post and another with a post that rakes outwards; most of these trusses have diagonal struts over the tie. Some timbers are chamfered; a scratched date from the 18th century is visible on the fourth truss, and the sixth truss was closed above the tie. The two box-frame trusses have undergone alterations. The cowshed lean-to includes half-trusses. The dividing wall between the barn and cowshed retains significant timber framing with full-height studs, originally with tall and narrow wattle and daub panels - a form comparable to rare examples of medieval close studding. A section of the floor remains stone-flagged.