White Slack

White Slack is an early 18th-century laithe-house constructed of watershot masonry with ashlar quoins and a stone slate roof. The building is two storeys high and features a double-pile plan with a single cell, plus an additional cell taken from the barn on the ground floor, which has a hay-loft above. Both floors have double chamfered mullioned windows with six lights, although some mullions have been removed from the ground floor window. The entrance has tie-stones and a two-light window. There is a segmental arched cart entry supported by long skewbacks, with an inner entry formed by a portal. An additional doorway leads into the new cell at the re-entrant angle, and there is a mistal doorway at the lower right corner. The building includes chamfered rectangular ventilators, and the left return wall has two blocked taking-in doors with tie-stone jambs. The rear of the building has a similar arrangement. The kneelers do not have copings, and there is a single stack at the ridge.

Inside, the barn consists of three bays formed by two tall stone pointed arches with well-dressed voussoirs. This building is part of a group in the Todmorden region that features stone arched barns instead of timber trusses, and it is likely the earliest example, distinguished by its double chamfered mullioned windows.