Over five hundred years old, the roof, which contains nine main trusses, is one of the few mediaeval timber roofs still surviving in Scotland. It is of comparatively rough workmanship. The trusses comprise tie-beam, king-post, struts and principal rafters, supporting purlins and ridge-piece. Extra rigidity is afforded by short longitudinal struts which further support the ridge-piece and the adjacent pair of purlins, while the ends of the trusses are supported on wall-posts, alternate trusses being further strengthened by stout curved brackets. These latter trusses, which form the main structural members of the roof, have long wall-posts supported on moulded corbels. The intermediate trusses have only short wall-posts, which rest, on the N., upon carved corbels, and on the S., upon the labels of the clearstorey windows.
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