only way sash replacement works is if Pella supplies proline sash, otherwise it will not work.
the JE might work if you buy Pella Architect or Lifestyle same frame size as the Proline. We have replaced rotted out units leaving the trim and JE up, just cut out the master frame and butt the new frame in.
That will not work the same way with Impervia ( which I would not suggest) or any other vinyl or 3 1/4" thick frame.
Pella Pro Line Replacement Sashes - Best Options?
- TheWindowNerd
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