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From : Sarah Jenkins , Principal Structural Engineer To : David Rossi , Conservation Architect , Heritage Trust Subject : Urgent : Southern Transept Deflection , St . Jude's Priory Date : Friday , 14 October , 17 : 14 David , What we need before Tuesday is formal written confirmation to install temporary steel shoring jacks beneath the fourteenth - century tie - beams in the southern transept . Our optical tilt sensors recorded an additional 4 . 2 millimetres of downward deflection following Thursday night's cloudburst . It was the eastern principal rafter that absorbed the bulk of the runoff when the valley gutter overflowed , and the timber joint is now visibly spreading at the mortise . Under no circumstances can this truss endure another sustained downpour without mechanical support . The Met Office projects gale - force winds and heavy rain for Tuesday morning . Should the roof suffer further lateral movement , the entire hammerbeam assembly could experience progressive shear failure . I understand your reluctance to introduce modern steelwork into a Grade - I listed sanctuary . However , what your conservation colleagues perceive as an invasive intervention is , in reality , the only measure capable of preventing structural collapse . Please issue the site permit by Monday noon . * * * From : David Rossi , Conservation Architect To : Sarah Jenkins , Principal Structural Engineer Subject : Re : Urgent : Southern Transept Deflection , St . Jude's Priory Date : Friday , 14 October , 19 : 42 Sarah , Rarely have I seen such an alarming deflection curve on historic oak , but under no circumstances will English Heritage sanction through - bolting into medieval heartwood without reversible collar clamps . What concerns me most about your proposed shoring scheme is the point - load transfer onto the fourteenth - century flagstones . Beneath that pavement lies an unexcavated vaulted crypt ; were the hydraulic jacks to exert direct downward pressure without distributing timber pads , we might well punch through the limestone vault below . You requested thirty days of patience in your previous risk matrix ; unfortunately , nature has granted us only seventy - two hours . What I propose instead is a compromise : we approve the installation of the steel tower on Monday at 06 : 00 , provided that the jacks bear upon broad Douglas fir spreader beams bedded in dry sand . Furthermore , clamping must rely on friction collars rather than invasive drilling . If your rigging crew can adhere to these stipulations , the site access permit will be signed before midnight . Let me know whether your contractor can deliver the timber spreaders by dawn .
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