After the window has been secured in the rough opening, how do you finish the inside part of the installation? For example adding a window sill and trimming out the inner portion of the rough opening, not the finishing trim around the window. Also does anyone have any videos or pictures of the process? The type and maker of the particular window i am installing is a ThermaStar by Pella 28" x 36" 10 Series Vinyl Double Pane Single Hung Window. Thank you

  • What kind and make of windows do you have? Different styles are finished differently.
    – Niall C.
    Commented Mar 1, 2012 at 21:41
  • ThermaStar by Pella 28" x 36" 10 Series Vinyl Double Pane Single Hung Window
    – Kevin
    Commented Mar 1, 2012 at 21:43

1 Answer 1


google "trim interior window" =

video: http://www.thisoldhouse.com/toh/video/0,,20046338,00.html

steps: http://www.thisoldhouse.com/toh/how-to/intro/0,,218130,00.html

Assuming you have already: 1) insulated in the rough opening with low-expansion spray foam 2) sheetrocked to the rough opening

  • thank you i was talking about something else and probably didn't word it right but in the video i saw what i need to do. thank you again. :)
    – Kevin
    Commented Mar 6, 2012 at 1:57

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