This sash sill had been the victim of a previous repair which used an off-the-shelf tropical hardwood sill, a steel weather bar, mastic, resin-based cement and a bucket of filler to bridge the gap between the repair and the remaining part of the original oak sill.
Before the repair began, we took careful measurements of the original parts of the sash window’s pulley stiles and beading. We then made a complete replacement sill in Accoya wood.
The old repair came out easily, after which we were able to carefully separate what was left of the original sill from the pulley boxes. We could then slot in the new Accoya sill, joining it into the stiles as-per the original. We made-good between the repair and the building’s fabric using materials sensitive to those used when it was first built. Lastly, we made sure the sashes were opening and closing perfectly before fitting new draft-excluding beading, restoring the window to full working order.
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