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  • Writer's pictureImrul Hassan

How to Maintain and Repair Leaded Windows

Leaded windows are not only beautiful architectural features but also valuable pieces of art and craftsmanship. Found in historic buildings, churches, and even modern homes, these windows require regular maintenance and occasional repairs to preserve their beauty and functionality. Whether you have a cracked glass pane or loose lead came, understanding how to properly maintain and repair leaded windows is essential to ensure their longevity. In this guide, we will explore the steps involved in maintaining and repairing leaded windows, offering practical tips and guidelines to help you keep these stunning pieces of art in excellent condition. From routine cleaning and inspection to more intricate repair techniques, you'll gain insights into caring for leaded windows and protecting their timeless elegance. So, let's delve into the world of leaded windows and learn how to maintain and repair them effectively.

How to maintain and repair leaded windows


Leaded windows, also known as stained glass windows, are crafted through a meticulous process that combines artistic vision, skilled craftsmanship, and precise techniques. Here is an overview of how leaded windows are traditionally made:

● Design and Pattern Creation: The process begins with the creation of a design or pattern for the window. This can be done by a stained glass artist or designer. The design is often drawn on paper or created using computer software to determine the layout of the glass pieces and the placement of the lead came.

● Selection of Glass: Different types of glass are chosen based on their color, texture, and opacity to bring the design to life. Colored glass sheets are selected, which can vary in thickness and texture. These sheets are often transparent, translucent, or opalescent, allowing light to pass through and create stunning visual effects.

● Glass Cutting: The selected glass sheets are carefully cut into various shapes and sizes according to the design. Glass cutters, scoring tools, and running pliers are used to score and break the glass along the desired lines. This process requires precision and skill to achieve accurate shapes and smooth edges.

● Assembly: The cut glass pieces are individually wrapped with strips of H-shaped lead came. The lead came is made of flexible, soft lead that can be manipulated to follow the contours of the glass pieces. The lead came not only holds the glass in place but also creates the characteristic lead lines that define the design. The glass pieces are fitted into the channels formed by the lead came, and the lead came is carefully bent and soldered at the joints to secure the glass pieces together.

● Soldering: Once the glass pieces are held in place by the lead came, the joints are soldered to create a strong and stable structure. Solder, typically a combination of tin and lead, is melted and applied to the joints using a soldering iron. The solder forms a solid bond, reinforcing the lead came and ensuring the integrity of the window.

● Cementing and Finishing: After soldering, a special cement mixture, often made of whiting (chalk) and linseed oil, is applied to the lead came joints. This cement fills any gaps between the lead and glass, adding strength and stability to the window. Excess cement is removed, and the window is cleaned and polished to enhance its appearance.

● Installation: Once the leaded window is complete, it can be installed into its intended location, such as a window frame or architectural opening. It may be secured using appropriate supports, such as metal bars or clips, to ensure proper stability and prevent any damage.

Throughout the entire process, from design to installation, leaded windows require skilled craftsmanship, attention to detail, and a deep understanding of glasswork techniques. The result is a stunning work of art that captures and diffuses light, adding beauty and character to any space.


● Fixing problems with leaded windows may involve addressing various issues that can arise over time. Here are some common problems and their potential solutions:

● Cracked or Broken Glass: If a glass pane in a leaded window is cracked or broken, it will need to be replaced. Carefully remove the damaged glass and replace it with a new piece of glass cut to the appropriate size and shape. Secure the new glass using lead came and solder the joints.

● Loose or Damaged Lead Came: Over time, lead came can become loose, bent, or damaged, compromising the stability of the window. If a section of lead came is loose, carefully remove it, clean the area, and apply a new piece of lead came. For bent or damaged lead came, use pliers or a fid to straighten or reshape it as closely as possible to its original form.

● Weakened Solder Joints: Solder joints can weaken or break over time, leading to instability in the window. Inspect the window for any loose or weak solder joints. Reapply flux and solder to reinforce the joints, ensuring a strong connection between the lead came and the glass.

● Deteriorated Putty: The putty used to seal the glass and lead came can dry out or crack over time. Remove the old putty and replace it with fresh putty. Apply a thin layer of putty between the glass and lead came, ensuring a secure and weatherproof seal.

● Cleaning and Maintenance: Regular cleaning and maintenance are essential for preserving leaded windows. Use a soft brush or cloth and a mild glass cleaner to clean the window periodically, avoiding abrasive materials that could damage the glass or lead came. Inspect the window for any signs of damage or deterioration and address them promptly.

● Restoration and Professional Help: For extensive damage or intricate restoration work, it is advisable to seek the assistance of a professional stained glass restorer or artisan. They have the expertise and specialized tools to handle complex repairs and restore the window to its original condition.

● It is important to approach the repair process with care and precision, as leaded windows are delicate and require specialized techniques. If you are unsure about the repair process or if the damage is significant, consult a professional to ensure the best results and to prevent further damage to the window.


● Repairing scratches on glass surfaces can be a challenging task, but it is possible to minimize their appearance or even remove shallow scratches with the right techniques. Here's a step-by-step guide to repairing minor scratches on glass:

● Clean the Surface: Begin by thoroughly cleaning the glass surface around the scratch to remove any dirt or debris. Use a mild glass cleaner and a lint-free cloth to ensure the area is clean and free of contaminants.

● Assess the Depth of the Scratch: Examine the scratch carefully to determine its depth. If the scratch is deep, it may be difficult to completely remove, but you can still try to minimize its visibility.

● Apply a Glass Polish or Compound: For shallow scratches, you can use a specialized glass polishing compound or cerium oxide to buff out the scratch. Apply a small amount of the compound onto a soft, clean cloth or a polishing pad.

● Rub the Scratch in Circular Motions: Gently rub the compound onto the scratched area using circular motions. Apply light pressure and continue buffing for a few minutes, making sure to cover the entire scratch.

● Clean and Inspect: Once you have buffed the scratch, clean the area again to remove any residue from the polishing compound. Examine the glass surface to see if the scratch has improved or disappeared. Repeat the process if necessary.

● Use Toothpaste as an Alternative: If you don't have a glass polishing compound, you can try using toothpaste as a substitute. Use regular white toothpaste (not gel) and apply it to the scratched area. Rub it in with a clean cloth using circular motions. Rinse the glass and inspect the results.

● Consider Professional Help for Deep Scratches: If the scratch is deep or the above methods do not yield satisfactory results, it may be best to consult a professional glass repair service. They have specialized tools and techniques to handle more extensive or severe scratches.

● Remember, these techniques are most effective for shallow scratches on glass surfaces. It's important to be cautious and avoid using abrasive materials or aggressive polishing techniques, as they can potentially worsen the damage or create uneven surfaces on the glass. When in doubt, seeking professional assistance is recommended to ensure the best outcome.


Maintaining and repairing leaded windows is a labor of love that requires attention to detail, patience, and a deep appreciation for their artistic and historical value. By following proper maintenance practices such as regular cleaning, inspection for damage, and addressing issues promptly, you can preserve the beauty and functionality of leaded windows for years to come. When it comes to repairs, it's essential to approach them with care and consider seeking professional assistance for complex or extensive restoration work. While minor repairs like replacing cracked glass or reinforcing solder joints can be tackled by knowledgeable enthusiasts, the intricate nature of leaded windows warrants the expertise of stained glass restorers or artisans. Remember, leaded windows are not just architectural features; they are captivating pieces of art that deserve the utmost care and respect. By maintaining and repairing them diligently, we can ensure that these stunning windows continue to adorn our spaces and inspire generations to come.

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