This is a wooden window from a grade 2 listed building in Amersham dating back to 1775 .The sill wasn’t rotten enough to replace so we took the unusual method of patch repairing in Accoya. For this method the rot is routed out using templating and preservative poured into the troughs then left for a week to soak in and dry out before new pieces of Accoya wood are then glued into the space.Yorkshire sliders vary depending on their age this one had 3 x protruding 3/4 inch oak pegs coming out of the sill to stop the sash falling out when its opened.The best method which came later is a 1/2 inch hardwood horizontal parting bead that runs inside a grooved bottom rail.
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