How to Restore Old Wood Windows: A Step-by-Step Guide

Restoring old wood windows may seem like a daunting task, but it’s actually easier than you might think. With the right tools and techniques, you can breathe new life into your historic windows and save them from the landfill. In this comprehensive guide, we’ll walk you through the process of restoring old wood windows, from start to finish.

Why Restore Old Wood Windows?

There are several compelling reasons to restore old wood windows rather than replacing them with modern alternatives:

Architectural integrity: Historic wood windows are an integral part of a building’s character and charm. Replacing them with generic modern windows can detract from the overall aesthetic.
Environmental benefits: Restoring old windows is a more sustainable option than sending them to the landfill and manufacturing new ones. It reduces waste and conserves resources.
Energy efficiency: With proper weatherstripping and storm windows, historic wood windows can be just as energy-efficient as modern replacements. They also have a longer lifespan, reducing the need for frequent replacements.
Cost savings: Restoring old windows is often more cost-effective than replacing them, especially if you do the work yourself. The materials needed for restoration are relatively inexpensive compared to the cost of new windows.
Tools and Materials Needed for Window Restoration

Before you begin your restoration project, make sure you have the following tools and materials on hand:

Sandpaper (40 grit, 120 grit, and 240 grit)
Wood chisel
Glazier’s putty
Glazier’s tacks
Paintbrushes
Paint
Wood filler (suitable for windows)
Wood glue
White spirit
Putty knife
Glass scraper
Orbital sander and/or palm sander
Chemical paint stripper (if completely stripping paint)
Heat gun
Paint shaver

Preparing the Window for Restoration

The first step in restoring an old wood window is to prepare it for the process. This involves:

Checking the general condition of the window
Removing the glass
Removing flaky paint and putty

Use a chemical paint stripper, heat gun, or paint shaver to remove old paint and putty. Be careful not to damage the wood in the process.

Repairing Damaged Wood

Once the window is stripped, you can assess the condition of the wood and make any necessary repairs. Fill cracks with wood filler, glue any loose parts back together, and sand everything smooth.

If there are areas of severe damage or rot, you may need to use an epoxy wood repair system. This involves digging out the damaged wood and replacing it with a two-part epoxy that can be shaped and sanded once cured.

Sanding and Priming

After making any necessary repairs, sand the window frame and sashes using progressively finer grits of sandpaper. Start with 40 grit for the initial smoothing, then move up to 120 grit and finally 240 grit for a smooth finish.

Once sanded, wipe away any dust and apply a coat of primer to the wood. This will help the paint adhere better and provide a protective layer against the elements.

Glazing and Painting

With the window primed, it’s time to glaze the glass panes. Apply glazier’s putty around the edges of each pane, pressing it firmly into place. Use a putty knife to smooth the putty and remove any excess.

After the putty has cured, paint the window frame and sashes with a high-quality exterior paint. Apply at least two coats, allowing each coat to dry fully before applying the next.

Reinstalling the Window

Once the paint has dried, you can reinstall the window in its frame. Make any necessary adjustments to ensure a proper fit and smooth operation. If the window has a pulley system, make sure it’s in good working order and replace any worn or damaged parts.

Finally, install any necessary weatherstripping to improve the window’s energy efficiency and prevent drafts.