For a block wall installation fasten with rust resistant screws using a toe nail method through the jambs into the head and sill boards at each corner.
How to install a window in a concrete block wall.
Some preparations to the window opening can make the job much easier and leave the window prepared for interior and exterior finishing.
Go step by step for adding a new construction window.
Score the outside surface of the cinder blocks with a circular saw fitted with a masonry blade then knock the cinder blocks out of the window opening with a small sledgehammer.
Cut a hole in the cinder block wall if you are enlarging an existing wall or putting in a new window.
How to install a window in a concrete wall.
In a concrete wall without wood framing install the window framework by fastening it into the concrete wall with self tapping concrete screws.