Overview: The This Old House team installs a zero-clearance fireplace with a handsome cast-iron firebox. Window rehabilitation specialist David Liberty shows us his method of refurbishing the building's existing windows using old-fashioned, long-lasting materials. Show friend George Putnam works with a new stripping chemical to relieve the decorative carving on the front gable of its layers of paint, while our host visits the new owners of last season's home, the 1724 Colonial in Milton, Massachusetts. Our master carpenter checks in with a/v specialist Steve Hayes as he pulls ""futureproof"" wiring bundles through the walls and back to a central switching box. Finally, custom cabinet maker Ted Goodnow and homeowner Sue Denny shows us the progress they've made towards finalizing the kitchen's look.