How to Install Replacement Windows. Replacing single-pane windows with double-pane, low-e coated glass can make a house more energy efficient and save you money. Here's how to install a new unit. You will need Flat pry bar Hammer Tape measure Pencil Circular saw Hand grinder Utility knife Caulk 1 1/2-in. galvanized roofing nails Level 6d galvanized box nails Putty knife and wood scraps (optional). Step 1. Carefully
remove the window frame's exterior trim using a flat pry bar and a hammer. Then, take out any exposed nails from the window frame. Step 2. With a tape measure and pencil, measure and mark a line 1 1/4 inch out from all sides of the existing window frame. Then, set a circular saw to the depth of the house's siding and cut along the line all the way around
the window frame. Remove the cut piece with the pry bar to expose the window's nailing fin. Take out any panels that open, known as active panels, from the old window before removal to make the unit lighter. Step 3. Use a hand grinder to remove the heads from any nails in the nailing fin and pry the remaining window unit out from the wall. Pull out or drive down
any remaining nails, and use the pry bar to clean out any caulking and debris from the empty window frame. Step 4. Measure from the replacement window's nailing fin to the interior edge. Add 1/8 inch to this length. Then, measuring from the outside in, mark and draw a line at this new value all the...
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