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All infected timber was cut away up to the first purlin and trusses were cut back by one meter beyond any timber infection. The timbers were then treated. All ironwork from the original truss feet was recovered and cleaned and painted. New thrust blocks and truss rafters were fabricated to original dimensions and details. A scarf joint was agreed and drawn onto the retained sections of the truss rafters and carefully cut and dressed; new timbers were then scarfed into the originals, glued and bolted together. On completion of the timber repairs care was taken to stain all the new timbers to match the existing. A new lead covered valley was formed with the increased number of drops and weirs enabling lead lengths to be minimized. The outfalls at either end of the valley were improved to facilitate easier and safer cleaning of the valley gutter. Safety eyelets were also installed to provide permanent fixing points for ladders or other access equipment.

Click here to view a pdf of the Ratby process.

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