Measure the window, width and height. Determine the direction for laying the foil, widthwise or lengthwise, and add 3 inches to that measurement.
Cover the pane from edge to edge with the shiny side facing out. Tape the ends to the side of the casing for picture windows. Wrap the extra foil onto the siding of framed windows and tape. Tape down all edges on the window.
Place the next foil strip so that it overlaps the first by 1/8 inch. Tape it down. Repeat until the window is covered.
Measure the window casing, width and height. Cut a piece of cardboard with the same dimensions as the window, using scissors
Wrap the cardboard in foil on both sides like a gift, with the shiny side facing up. Tape the ends together.
Insert the foil-wrapped cardboard into the window casing.
Things You Will Need
- Measuring tape
- Adhesive tape
- Use masking tape if the window framing material is adhesive-sensitive.
- Staple the foil to the cardboard or apply glue to all corners.