How To Easily Install a Bay Window

Installing a bay window can be done this way while bluegrass music plays in the background for your listening pleasure:

If you already have a window supplier and a window design in mind, you simply call your supplier and schedule a discussion about installing a bay window and the steps involved in the installation. Ask him to help you take measurements and inspect the job site for potential problems like molds and such. Your bay window design should be custom-made for best results.


  1. Remove the sash supports and tracks holding the windows in place.
  2. Remove window screens followed by the large glass pane at the center by tapping the structure from the outside. Gently pull the structure towards you then, lift it out as gently as you can.
  3. Pry off the interior sill and window casings. The only thing that’s left for you to remove would be your weather-proofed window frames. You have now successfully removed the frames and trimmings from the whole opening.
  4. If there is wood damage, remove a couple of shingles and cut a few sheets off the damage wood until a smooth surface is revealed. Proceed to replace it with a new section.
  5. Lay down a stable, flat, and level piece of regular-sized wood for the foundation. This will provide durability for the frame.
  6. Apply industrial-strength rubberized aluminum tape called a flushing tape to prevent moisture from seeping in.
  7. Now it’s time to install the main frame. Fit this into the space and screw the frame in.
  8. Outside, attach support cable clamps to the solid wood above the window opening on both sides. Next, thread a support cable into the cable clamps and once the window deck is level, tighten the cable clamp. 
  9. Now that the frame is secure, proceed installing the center glass pane and secure this in place using a power tool.
  10. Install your custom-made double-hung wooden frame which can be done in seconds by merely snapping and tilting the frame into place.
  11. Finally, insert about a half-inch thick of wood between the spaces on top and the rough opening of the frame. Use an electric-saw to cut off excess wood then proceed by screwing the unit in place.


  1. Begin with roof protection installation.
  2. Fill the interior space of the exposed roof with fiberglass mats followed by plywood sheets, wood trims and metal drip caps along the edges of the roof.
  3. Cover the entire space of the roof with industrial-strength felt. For maximum protection, lay down double linings of flushing tape extending beyond the space covered by the industrial-strength felt. 
  4. Apply a single layer of roof shingles then cover the exposed portion of the roof shingles with metal flashings. Next, add the final layer of the remaining shingles.
  5. Now that you’re done with the roof, the belly or underside of your bay window needs attention. Layer thick wood trims to the sides of belly of the frame. You know that you did this correctly when you were able to form a hexagon to support the belly of your bay window and then follow it up by placing rigid foam installation into the cavity followed by a thick plywood cover.
  6. Take your power screwdriver and use this to drive in the screws to secure the decorative wood and prefabricated shingles.
  7. Head back to the interiors now and take a canister of foam sealant. Spray on a good, thick layer of the sealant on the cavity of the internal frames of your bay window for insulation against heat and cold. Finally, cover the exposed frames with paneling, trim, and decorative wood and use your power tool to drive the nails in.

Finally, take your insect barrier screen and place it on your bay window. Now, you are truly done!


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