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Lower Trebarret House is made up of two buildings, the oldest having a Delabole rag roof, which dates back to 1640. The other roof had 20” by 10” Delabole slates, which was built 150 years late.
Both roofs were suffering from slipped slates, due to nail fatigue and no felt/membrane. Upon removal of the rag slates it became evident that the 2” by 2” rafters and the 3” by 3” purlins were no longer fit for purpose, due to rot and beetle infestation.
The purlins and rafters would have to be replaced and kept in keeping with the original roof. This was discussed with the owners and their permission was given before commencing the work.
Using new treated timbers, which included a new ridge board, new wall plate, new purlins and new rafters. We then fit a new 3 ply breather membrane with new treated, 2” by 1”, battens. The battens have to spaced accordingly, due to the diminishing sizes of the rag slates. We then finished the roof, using reclaimed clay ridge tiles.
Both roofs are now structurally sound and in keeping the period of the building.