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Read Article Here:https://www.aconcordcarpenter.com/how-to-replace-a-basement-window.html
Installing The New Window:
Remove the sash and screen from the window so you can access the screw holes.
Center window in the opening and hold it up to the house mud sill.
Pre-drill holes through the window frame and secure window to the mud sill with galvanized or stainless steel screws.
If attaching to masonry, use a hammer drill and secure the window into place by installing double-threaded concrete screws along the sides and top of the window.
Install screw cover plugs if they come with your replacement window.
Filling In the Gaps:
Depending on the size of gap you have, fill any large gaps between the window and masonry foundations with one or a combination of the following:
□ Mortar
□ Mortar and brick, stone
□ Caulk along the sides and top of the window frame
□ Spray urethane foam under the sill to seal the bottom of the window
□ Custom cut pipe insulation to fill bap and prevent mortar from falling out.
TIP: Use pipe insulation or foam backer rods to keep spray foam or mortar from falling through back side.