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Roof Replacement - Fern Bank

The two sections of the existing roof were in bad to very bad shape. The existing trusses and purlin's were constructed from green oak a few hundred years ago, basically small oak trees would have been cut down, and then assembled into beams and trusses with little cosmetic working of the timber. This provides the very beautiful oak beams we are used to in old English homes, conversly it makes it very difficult to replace sections. Since only one half of the roof gable was damaged in each roof section, the ridge had to be propped so we could remove one half, without the other collapsing.

roof repair
The existing Oak purlin had been badly replaced sometime in the past 50 years, and had resulted in a purlin being installed sloping down the roof, therefore pushing it up at one end. A 10" x 4" replacement purlin was put in the correct place slightly further up the roof, so a new roof with constant pitch could be constructed. Above is the completed section with space cutout for a conservation roof window.

roof repair roof repair
Detail of the new ceiling joists tying the roof together, and of space for conservation roof window.




roof repair
The next section was trickier, as it was split in two by a traditional truss. One of the purlins had rotted at one end, so a reclaimed piece of timber was used to replace it. Since it was jointed to the truss and next purlin with a doweled mitred tennon, an identical joint would have to be cut. You can see above the old and new (reclamed) purlin after the joint was cut.

roof repair

roof repair
The replacement purlin being put in place.



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