Use a water resistant variety to keep the water from flooding in.
How to frame in a window in a concrete wall.
Cut a piece about 10 inches longer than the rough opening width.
First consider installation in a wall with an exterior face of foam.
Follow the same steps for the other 3 sides of the concrete opening.
Measure the concrete opening and cut a 2x4 to fit across the lower sill.
This will give you a wood buck to install the window inside of.
Drill holes through the side of the window frame and into the cinder blocks with a hammer drill.
Step 4 insulate the gap between the window frame and the rough opening by filling it with expanding spray foam insulation.
Once the frame is in place seal around the frame and concrete using an exterior caulk.
Anchor this 2x4 to the concrete with screws or anchors.
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.
The first step is to wrap the sill with self adhering flashing.
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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.
Use wood shims and a level to make sure this piece is level.
The piece should be about 14 inches wide.