The Greatest Guide To Window InstallationRemove the leading sash and after that get rid of the parting stop and the reduced sash - pre-made windows. Fill any kind of holes with timber filler and also ensure you have solid timber where you'll screw the new window right into the frame for stability (board up company). If you find damaged or rotten wood, eliminate it and cut new timber to change it (pre-made windows).Make sure to work it into the edge of the stool. Check the sill for level as well…See More