For thermal-upgrade window replacement in Tarleton, the technical sequence begins with keeps, so we adjust keeps to achieve consistent engagement without making operation unnecessarily stiff, with keeps kept as the lead check for this thermal-upgrade windows scope. We then use sash compression to coordinate glass specification, frame perimeter, cavity interface, seals and internal reveals, and we set sash compression evenly enough to support sealing without creating heavy operation, with keeps kept as the lead check for this thermal-upgrade windows scope. Before closure, frame dimensions is reviewed and we confirm manufacturing dimensions against the surveyed opening before the replacement frame is ordered, with keeps kept as the lead check for this thermal-upgrade windows scope. The handover also covers packers; we support the frame at suitable points so fixing does not pull it out of line. Together these checks support replacement glazing with the frame perimeter and surrounding junctions coordinated for thermal continuity, with keeps kept as the lead check for this thermal-upgrade windows scope.