Guidelines for installing New Construction windows
Weather –Resistant Barrier (WRB) Applied after the Window Installation – Flashing applied Over the Face of the Mounting Flange
Dimensions referenced are based from 9 inch flashing. If a different width of flashing is used, these dimensions will change to correspond to the width of that material.
Installation details are based on non-self-adhering flashing. If self-adhering flashing/tape is used, some steps such as caulking in steps 4 and 6 can be eliminated. The self-adhering tape/flashing will be installed over the nail flange detailed in steps 5 and 7. Consult self-adhering tape manufacturer’s installation instructions for proper installation of their product.
Step 1 – Apply and fasten the horizontal sill flashing material first, level with the top edge of the rough opening and long enough to extend 9 inches beyond the jamb flashing.
Step 2 – Apply a continuous bead of sealant to the backside of the window-mounting flange and immediately set the window in the opening.
Step 3 – Apply shims as required to ensure the unit is plumb, level and square and fasten the window perimeter securely into position. Fasteners should be placed at a minimum of every other hole in the mounting flange.
Step 4 – Apply a continuous bead of sealant to the exposed mounting flange at the side jambs of the installed windows. Continue the sealant bead at the jambs vertically 8.5 inches above the rough opening at the head of the window. (NOTE: If using a self-sealing window tape, Step 4 and 6 may be omitted)
Step 5 – Install the jamb flashing by pressing the flashing into the sealant beads applied in Step 4. Extend the flashing 8.5 inches beyond the rough opening at the head and sill. Attach flashing into position using appropriate fasteners.
Step 6 – Apply a continuous bead of sealant to the exposed mounting flange at the head of the installed window. (NOTE: If using a self-sealing window tape, Step 4 and 6 may be omitted)
Step 7 – Install the head flashing by pressing the flashing into the sealant bead previously applied across the mounting flange. Press the bottom edge of the flashing into the sealant. Extend the head flashing 10 inches beyond the rough opening on either side, over the top of the jamb flashing, and fasten into place using the appropriate fasteners.
Step 8 – In a water shedding fashion, install the weather resistant barrier (WRB) to the building framing. At the sill, tuck the WRB under the sill flashing and loose ends of the flashing. Continue to apply the WRB in a water shedding fashion over the jamb flashing and head of the window.
DISCLAIMER: AMI provides the above guidelines for installing new construction windows. These are general guidelines and do not cover every installation type. If your installation type differs from what is mentioned above, or you require more detailed information, please refer to the ASTM E2112-01 Standard Practice for Installation of Exterior Windows, Doors and Skylights.
Associated Materials Inc. is not responsible for damages due to improper installation of the window unit or the structural integrity of the building to which the windows are being installed.
These guidelines are based on nationally accepted installation methods for new construction windows. Please refer to your local building codes prior to installation of the window unit.