Existing Frame Condition: The Make-or-Break Test for Aluminum Insert Windows
Existing Frame Condition Is the Real Gatekeeper The most important factor in a retrofit is not the new sash, the glazing package, or even the brand. It is the condition of the frame the new unit has to live in. That is the central logic behind aluminum insert windows: the existing frame stays in place, so the success of the upgrade depends on whether that frame is still straight, dry, and structurally reliable. ...