Either type of replacement window must be installed in a solid rot free jamb.
Installing a vinyl replacement window.
They are available as double hung sliding or casement style windows.
You have two choices for vinyl replacement windows.
How to install vinyl replacement windows.
Remove old storms or screens.
To start you ll need to remove the old window by removing the inside trim moldings and stops with a broad chisel.
Then pry out the parting stops at the tops and sides of the window and remove the top.
Now that the window is out of the wall check the window jamb and the window stop for structural damage.
If there are screens or storms mounted outside the house remove them first.
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.
Sometimes called a pocket window an insert replacement slips into the existing opening and is then fastened to the old side jambs.
Center the new window in the opening supporting it with wood blocks and shims placed below the horizontal jambs.
When replacing an old window with a vinyl replacement window you will no longer need storm windows or separate screens.
Installing a vinyl replacement window is relatively straightforward and you can do it in an afternoon provided you have the right tools.
More advanced project because you have to remove interior and exterior trims and sometimes the siding.
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.
If they re rotten or badly out of square the whole unit including the frame may need replacing.
For these to work the existing window frame must be level and square.
Make sure the window is plumb and level and adjust the shims if necessary.
This is a much bigger and more complicated job than installing a vinyl window insert and may require a pro.
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Installing a full frame replacement window for example is more complex than installing an insert replacement window.
Necessary when existing window frames are old and deteriorating.
Full frame windows and insert windows.
However before deciding to tackle the how to install replacement windows job yourself check the condition of your existing window frames.
An insert replacement window consists of a fully assembled window in a ready to install secondary frame.