The Sash Window Rot Repair Process
This property had a classic case of rotten timber within the corners of the sash frames. Having been left for many years without treatment, it was time to address the problems of rot.
Rotten timber both in the sash frames and within the box can be repaired using an epoxy resin, which once decorated you would not know the window had been repaired.
If there is still a sufficient amount of structure within the timber around the rotten areas, as was found here in Highgate, then a sash window rot repair using epoxy resin is by far the best solution over replacing windows or sections of timber.
The rot repair involved removing all rotten timber, if the timber is wet with moisture, this will be dried out and hardened, ready for the resin. Before the resin was applied the area of timber had all paint removed and was sanded flat.