subject: Installing A Single Hung Window In An Existing Wall [print this page] Also known as a fixed window, single hung windows as the most basic type there is: just a pane of glass that doesn't move. The first step is to use a reciprocating saw to cut the opening for the window. Be sure to check the wall for any electrical lines or conduits before cutting. Also, cut the hole from half an inch to three-quarters of an inch too big; this will give you room for adjustments.
Lift the window into position and check that it fits correctly, and then put it aside. Next, apply the flashing tape to the sill, one strip on the inside edge and then one along the outside edge. You want it to go up the side of the opening a couple inches, on both sides.
Put the spacers on the sill and make level by using shims, and then put the single hung window in place - from the outside. Using a level, get the window plumb and level, and use more shims to get it that way. Around the edge of the single hung window are the nailing fins. Attach them with galvanized nails; each fin has prepared holes, so just tack each nail in one of them.
Next comes the flashing tape, first on the sides, and then along the top. With the sides, make the tape go beyond the edge of the fin by two inches; on the top, one inch.
On the inside, insert insulation around the frame, and then repeat on the outside. Then caulk the outside with sealant. After that, slide the installation fins on the outside and seal again; and repair and paint the drywall on the inside.
