Drill holes through the side of the window frame and into the cinder blocks with a hammer drill.
How to frame in a window in a concrete wall.
Step 4 insulate the gap between the window frame and the rough opening by filling it with expanding spray foam insulation.
Follow the same steps for the other 3 sides of the concrete opening.
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Once the caulk is dry install the window glass caulk around the edges of this frame and then drive in more screws to keep the window frame in place.
First consider installation in a wall with an exterior face of foam.
Use wood shims and a level to make sure this piece is level.
Use a water resistant variety to keep the water from flooding in.
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.
This will give you a wood buck to install the window inside of.
Lower the window into the framed opening inserting the bottom window edge first then tipping in the top.
Cut a piece about 10 inches longer than the rough opening width.
In a concrete wall without wood framing install the window framework by fastening it into the concrete wall with self tapping concrete screws.
The first step is to wrap the sill with self adhering flashing.
Anchor this 2x4 to the concrete with screws or anchors.
Drive concrete screws through the frame and into the cinder blocks to secure the window in place.