Installation Instructions
Replacement Windows
Installation of the Sill Adapters
Sill adapters enclose the cavity between the bottom of the replacement window and the sloped wooden sill of the old window frame. The adapter snaps into the exposed accessory groove at the bottom exterior of the window.
- Fill the cavity under the replacement window using fiberglass batt insulation.
- Cut the sill adapter to length. You may prefer to cut it a little long and tuck the ends behind the exterior stops.
- Measure the height from the wood sill to the groove in the bottom of the replacement window.
- Mark the sill adapter and score with a utility knife using the grooves provided on the back of the adapter. Snap off the excess material and discard.
- Now snap the sill adapter into the accessory groove on the window.
- Neatly run a bead of caulking where the sill adapter meets the wood sill and up the two edges at the blind stops. Tool this caulking for a neat appearance.
The optional two-piece sill adapter installs similarly but the height is adjustable so no trimming is necessary. Snap the assembly into the accessory groove as above, apply a bead of caulking under the adapter, and pull down the bottom portion of the two-piece adapter so it sets in the caulking on the wooden sill of the old window. Tool any exposed caulking for a neat appearance.
An optional head expander is available to help fit the replacement window unit into the rough opening, especially when the opening is out of square. The head expander fits over the top of the window unit and can be adjusted up or down at any angle to fit the opening.
Finish-up and Adjustment
Check the operation of the window and make final adjustments as necessary. Pay close attention that the window jambs are not bowed as this will make operation difficult and diminish performance. Reinstall interior trim along the top and sides of the window frame. Demonstrate the operation of the window to the homeowner including tilt/wash features.
