How To Glaze A Window: This Old House

Glazing a window is an essential step in maintaining the beauty and functionality of your windows. Over time, window glazing can deteriorate and become cracked or loose, allowing air and water to seep through. This not only affects the energy efficiency of your home but also compromises the structural integrity of the window. In this comprehensive guide, we will walk you through the process of glazing a window, using the tried and tested methods from This Old House. With clear instructions and helpful tips, you’ll be able to restore your windows to their former glory.

Contents:

1. Introduction to window glazing

2. Tools and materials needed

3. Removing old glazing

4. Preparing the window for glazing

5. Mixing and applying the glazing compound

6. Smoothing and shaping the glazing compound

7. Drying and curing the glazing compound

8. Painting and finishing touches

9. Frequently Asked Questions (FAQs)

1. Introduction to window glazing

Window glazing refers to the process of sealing the glass pane within the window frame using a specialized compound. It serves multiple purposes, including creating an airtight seal, providing insulation, and protecting the glass from external elements. There are two common types of glazing used in windows: putty glazing and caulk glazing. Putty glazing involves using a putty-like compound, while caulk glazing uses a flexible sealant. In this guide, we will focus on putty glazing, which is the traditional method used in older homes.

2. Tools and materials needed

Before you start glazing a window, gather the following tools and materials:

– Glazing putty: Choose a high-quality glazing compound that is suitable for your window type.

– Glazing points: These small metal pieces are used to secure the glass in the window frame.

– Glazing knife or putty knife: This tool is used for removing old glazing and applying new glazing compound.

– Paint scraper: Use a paint scraper to remove any old paint from the window frame.

– Sandpaper: You may need sandpaper to smooth the window frame before applying the new glazing compound.

– Glass cleaner: Clean the glass thoroughly before starting the glazing process.

– Paintbrush: Make sure to have a paintbrush for applying a coat of paint to the glazing compound.

– Painter’s tape: Use painter’s tape to protect the glass and surrounding areas from paint splatters.

– Linseed oil: This oil is used to condition the glazing putty, making it easier to work with.

3. Removing old glazing

Before you can apply new glazing, the old glazing must be carefully removed. Start by using a glazing or putty knife to loosen the old glazing by gently inserting the blade between the glass and the putty. Apply slight pressure to break the seal. Be cautious and work slowly to avoid cracking or breaking the glass.

Once the glazing is loose, use the knife to carefully remove it from the window frame. Dispose of the old glazing properly.

4. Preparing the window for glazing

After removing the old glazing, it is essential to prepare the window for the new compound. Begin by cleaning the glass thoroughly using a glass cleaner and lint-free cloth. This will ensure a clean surface for the new glazing compound to adhere to.

If there is any old paint or debris on the window frame, use a paint scraper to remove it. Sand the frame if necessary, ensuring it is smooth and free from any loose particles.

5. Mixing and applying the glazing compound

Before applying the glazing compound, condition it with linseed oil according to the manufacturer’s instructions. This step makes the putty more pliable and easier to work with.

Once the putty is conditioned, take a small amount and roll it into a rope-like shape. Press the rope of putty into the corner of the window frame and press it firmly against the glass. Repeat this process along each edge of the frame, ensuring a tight seal between the glass and the frame.

For larger windows, you may need to use glazing points to secure the glass in place. Insert these metal pieces into the frame, spacing them evenly along each side. Gently press the points down using a putty knife to secure the glass.

6. Smoothing and shaping the glazing compound

After applying the glazing compound and securing the glass, use a glazing or putty knife to smooth and shape the putty. Hold the knife at a slight angle and run it along the edge of the frame, removing any excess putty and creating a neat, beveled edge. Take your time with this step to achieve a professional finish.

7. Drying and curing the glazing compound

Allow the glazing compound to dry and cure according to the manufacturer’s instructions. This process typically takes a few days, during which time the putty will harden and create a strong seal. Avoid touching or applying pressure to the glazing compound during this time.

8. Painting and finishing touches

Once the glazing compound is fully cured, you can paint the window frame to complete the glazing process. Choose a high-quality exterior paint that is suitable for your window frame material.

Before painting, use painter’s tape to protect the glass and any adjacent surfaces from paint splatters. Apply a thin coat of paint using a paintbrush, ensuring even coverage. Allow the paint to dry completely before applying a second coat if needed.

Once the paint is dry, remove the painter’s tape carefully.

9. Frequently Asked Questions (FAQs)

Q1. How long does glazing putty take to dry?

A1. The drying time for glazing putty can vary depending on factors such as humidity and temperature. Generally, it takes around 3 to 5 days for the putty to dry completely.

Q2. Can I use caulk instead of glazing putty?

A2. While caulk can be used for glazing, it is not as versatile or long-lasting as traditional glazing putty. It is recommended to use the appropriate glazing putty for optimal results.

Q3. Can I glaze a window by myself, or should I hire a professional?

A3. Glazing a window can be done as a DIY project. However, it requires patience, attention to detail, and basic carpentry skills. If you are unsure or uncomfortable with the process, it is advisable to hire a professional to ensure the job is done correctly.

Q4. How often should windows be reglazed?

A4. Windows typically need to be reglazed every 10 to 20 years, depending on the condition of the glazing. Regular inspection of the glazing can help determine when it needs to be replaced.

By following the step-by-step instructions provided in this guide, you can successfully glaze your windows and ensure their longevity. Remember to take your time, work carefully, and consult the manufacturer’s instructions for specific guidance. With proper glazing, your windows will not only look beautiful but also provide optimal energy efficiency for years to come.