All of the natural stone slates were carefully removed from the south slope of the nave roof. They were cleaned and sorted by size and thickness. Damaged tiles were re-dressed so that they could be used again.

With tiles removed, repairs to the oak framed roof structure could be undertaken. This included the removal of debris that had built up over the years, such as nesting materials; the replacement of decayed oak by carefully cutting in new pieces of Welsh oak and; the use of modern materials to strengthen the structure in key places.