How to Install Hopper Windows

October 11, 2010

Installing windows can be a good project for a budding DIYer to gain some experience and help make their home more energy efficient at the same time. Smaller windows can be ideal to use as learning tools as they are fairly easy for one person to handle, and hopper windows might be perfect for your first time.

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How to Install Hopper Windows in your Home

  1. Measure the height and width of your framed opening and purchase a hopper window that's about a 1/2 inch smaller on all sides. If the hopper windows are going in a basement concrete wall, there should be a framed sill inside the concrete, and your measurements should be to the framing.
  2. Wrap the framed opening with 8-inch strips of roofing felt that extend to the exterior surface; the felt should be fastened with staples or felt nails.
  3. Place a bead of caulk around the outer surface of the opening where the nailing flange should cover it.
  4. Center the hopper window in the opening; use cedar shims as needed to hold it in place. If the hopper windows are going into the concrete wall opening, the nailing flange should be inside the concrete and over the wood furring.
  5. Nail or screw an upper corner of the window.
  6. Use a level to plumb and level the window, adjusting the shims as needed.
  7. Nail or screw the remaining 3 corners of the window.
  8. Check to make sure the window opens and closes properly and locks without a lot of effort. The margin should be the same between the sash and the frame on all sides.
  9. Finish securing the window and waterproof the exterior nailing flange with rubber membrane.

You now know how to install hopper windows; make sure you follow any specific recommendations provided by the window manufacturer.

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