Center the new window in the opening supporting it with wood blocks and shims placed below the horizontal jambs.
Installing a vinyl replacement window.
They are available as double hung sliding or casement style windows.
How to install vinyl replacement windows.
Wood or vinyl replacement inserts on the other hand are self contained units with their own jamb and sash and can therefore be slid into almost any type of window jamb.
Installing a full frame replacement window for example is more complex than installing an insert replacement window.
Replace the entire existing window down to the house frame.
Replace any damaged areas before installing windows.
However before deciding to tackle the how to install replacement windows job yourself check the condition of your existing window frames.
Make sure the window is plumb and level and adjust the shims if necessary.
When replacing an old window with a vinyl replacement window you will no longer need storm windows or separate screens.
More advanced project because you have to remove interior and exterior trims and sometimes the siding.
Necessary when existing window frames are old and deteriorating.
Download a pdf of these instructions.
An insert replacement window consists of a fully assembled window in a ready to install secondary frame.
Remove old storms or screens.
If there are screens or storms mounted outside the house remove them first.
You have two choices for vinyl replacement windows.
Either type of replacement window must be installed in a solid rot free jamb.
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To start you ll need to remove the old window by removing the inside trim moldings and stops with a broad chisel.
Installing a vinyl replacement window is relatively straightforward and you can do it in an afternoon provided you have the right tools.
For these to work the existing window frame must be level and square.
Then pry out the parting stops at the tops and sides of the window and remove the top.
If they re rotten or badly out of square the whole unit including the frame may need replacing.
An insert replacement window allows you to keep the existing window frame and trim whereas a full frame replacement window requires a complete tear out and replacement of the existing one.
This is a much bigger and more complicated job than installing a vinyl window insert and may require a pro.