How To Frame In A Window In A Concrete Wall

Cut a piece about 10 inches longer than the rough opening width.

How to frame in a window in a concrete wall.

Use wood shims and a level to make sure this piece is level. Drive concrete screws through the frame and into the cinder blocks to secure the window in place. 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. The first step is to wrap the sill with self adhering flashing.

Once the frame is in place seal around the frame and concrete using an exterior caulk. First consider installation in a wall with an exterior face of foam. 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. Drill holes through the side of the window frame and into the cinder blocks with a hammer drill.

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. Use a water resistant variety to keep the water from flooding in. The piece should be about 14 inches wide.

Step 4 insulate the gap between the window frame and the rough opening by filling it with expanding spray foam insulation. Lower the window into the framed opening inserting the bottom window edge first then tipping in the top. In a concrete wall without wood framing install the window framework by fastening it into the concrete wall with self tapping concrete screws.