How to Install Casement Window

How to Install Casement Window

To replace a window with a side-opening one follow these step-by-step directions about installing a casement window. Learn what's involved and what materials and tools you need to do the job.



 How to Install Casement Window

How to Install Casement Window

To replace a window with a side-opening one follow these step-by-step directions about installing a casement window. Learn what's involved and what materials and tools you need to do the job.

 How to Install Casement Window

How to Install Casement Window

To replace a window with a side-opening one follow these step-by-step directions about installing a casement window. Learn what's involved and what materials and tools you need to do the job.

By Gene and Katie Hamilton

Tools Required

  • Tape measure
  • Carpenter's level
  • Carpenter's square
  • Circular saw
  • Hammer
  • Chisel
  • Drill/driver
  • Level
  • Caulk gun

Materials Required

  • Casement window
  • 1 1/2-in. (4d) finish nails
  • 3/4-in.roofing nails
  • Shims
  • Insulation
  • Silicone sealant

Tools Required

  • Tape measure
  • Carpenter's level
  • Carpenter's square
  • Circular saw
  • Hammer
  • Chisel
  • Drill/driver
  • Level
  • Caulk gun

Materials Required

  • Casement window
  • 1 1/2-in. (4d) finish nails
  • 3/4-in.roofing nails
  • Shims
  • Insulation
  • Silicone sealant
  • Step 1 : Prepare the rough opening

    Prepare the rough opening

    Follow the window manufacturer's direction for the correct size and measurement of the rough opening and cut it to those exact dimensions. Make sure that the opening is level, plumb and square. Check for squareness and dimension by measuring diagonally across, upper left to lower right and upper right to lower left; if the measurements are the same, the opening is square. Make sure the sill plate is level by using a carpenter's square and level to confirm it is plumb and level. Test fit the unit to make sure it fits.

  • Step 2 : Apply extension jambs or drywall return

    Position the tongue on the drywall return or extension jamb into the groove on the frame. Hold firmly to avoid tipping and fasten in place using 1 1/2-in.(4d) finish nails.

  • Step 3 : Install the unit in the opening

    Install the unit in the opening

    Lift the window unit into the rough opening from the exterior. From the inside use shims at corners of the sill under the side jambs to make it level and center the unit.

    Install the unit in the opening From the exterior use 1 3/4-in. roofing nails to secure the unit in an upper corner.

  • Step 4 : Check for squareness and fasten

    Check for squareness and fasten

    Recheck for squareness and dimension by measuring diagonally across, upper left to lower right and upper right to lower left; if the measurements are the same, the opening is square. If the dimensions are not the same, adjust with shims as required and fasten the remaining corners.

    Check for squareness and fasten Measure across the head, center and sill of the window unit. Center dimensions should match the head and sill dimensions. Shim or block the side jambs, if necessary. Insert shims at midpoint behind the side jamb between the unit frame and rough opening. Fasten shims about every 18-inches. Secure the unit to the wood frame rough opening using 1 3/4-in. roofing nails spaced every other hole.

  • Step 5 : Insulate and seal the unit

    Insulate and seal the unit

    Fill any void cavities with insulation by stuffing it between the framing, extension jambs and rough opening on all the sides. Don't overfill it. Then apply a silicone sealant around the exterior perimeter of the window after the siding or other finishing trim is installed.

    Illustrations courtesy of Andersen Corp.
HA Get Pro Help