How to Replace Windows in an Old House

Introduction

Replacing windows in an old house can be a challenging but rewarding project, especially if you want to keep your home’s historic charm while also improving energy efficiency. This guide will walk you through the process of installing windows in a house built between 60 to 120 years ago, focusing on site-built wood double hung windows.

Measure and Prepare

When dealing with site-built wood double hung windows in an old house, the process is relatively straightforward, but it requires careful measurement and preparation. First, measure the window opening to the jambs, then deduct 1/4 inch to account for potential gaps. This ensures a snug fit. Stops, which are used to guide the window during operation, are often removable and can be reused with the new window. If the stops are screwed into place, you can remove them and reuse them for the new window.

Another important step is to insulate the weight pockets, which are designed to support the weight of the window. Proper insulation will help maintain the window’s functionality and energy efficiency.

Removing Existing Windows

To begin the removal of the old windows, start by removing any grout or metal arrowed attachment points around the frame. Afterward, carefully take out the cut glass and place it in the frame. Next, properly position the metal muntins and hold the glass in place. Seal the gaps around the window and the frame with caulk to prevent air leakage. Once sealed, paint the window and reassemble it in its original position.

Installing New Windows

All windows are built with a frame composed of the top head, two sides (jambs), and a bottom sill. In old houses, these frames are usually leveled to the opening with wood shims and nailed in place. The openings are then covered with trim and the joints are sealed to cover gaps between the frame and the window. To replace an old window, first remove the existing inside and outside trim from the head jambs and sill, ensuring to cut the nails holding the trim in place to facilitate the removal of the old window.

Once the old window is removed, it’s important to flash the opening with heavy plastic to act as a waterproof barrier against wind-borne rain. Place the new window in the opening, level it, and secure it with screws. If there are gaps between the frame and the new window, spray canned foam to fill them. Finally, reinstall the old or new trim and apply sealant to the joints to ensure a tight seal and excellent waterproofing.

Conclusion

Replacing windows in an old house requires meticulous attention to detail, but it’s a task that can significantly enhance both the aesthetic and functional aspects of your home. With the right tools and a step-by-step approach, you can successfully install new windows and maintain or enhance the vintage charm of your old home.