Installing glass panes into wooden or metal frames requires precision, care, and the right tools. One of the most useful tools for this task is the glazier point. These small, triangular or diamond-shaped pieces of metal help secure glass in place before sealing it with putty or glazing compound. Whether you are restoring a vintage window or doing a new glazing job, understanding how to use glazier points properly is essential for a safe and secure glass installation. This guide will explain the types of glazier points, the tools needed, and step-by-step instructions for using them effectively.
What Are Glazier Points?
Definition and Purpose
Glazier points are small metal fasteners used to hold glass panes in window frames. They are typically inserted into the edge of the frame to press against the glass, keeping it in place. Once installed, the glazier points are covered with glazing putty to secure and weatherproof the pane.
Types of Glazier Points
- Triangle Points: Flat, triangular pieces used in wooden sash windows. They can be inserted manually with a putty knife or point driver.
- Diamond Points: Diamond-shaped and slightly thicker, often used for securing heavier glass or mirrors.
- Screw-type Points: Twisted design that offers extra grip in wood and is installed by pressing or screwing into the frame.
- Push Points: Easy to install by hand, designed for quick DIY glass projects or framing.
Tools Needed to Install Glazier Points
Basic Tools
- Putty knife or stiff blade
- Glazier point driver (optional but useful for precision)
- Gloves and safety glasses for protection
- Glazing compound or window putty
- Glass pane (cut to fit)
- Window frame or sash
Optional Tools
- Flathead screwdriver (to adjust or remove old glazier points)
- Utility knife (to clean out old putty)
- Small hammer (for inserting screw-type points gently)
Preparing the Window Frame
Cleaning and Inspection
Before inserting glazier points, it is important to clean and prepare the window sash or frame. Remove any old putty, paint, or broken glass using a utility knife or chisel. Inspect the frame for damage such as rot, splinters, or warping. If the wood is damaged, consider making repairs before proceeding.
Positioning the Glass
Carefully place the glass pane into the frame. Use spacers if necessary to center it properly. Make sure the glass fits snugly without being forced. A too-tight fit could lead to cracking under pressure or temperature changes.
How to Insert Glazier Points
Manual Installation Method
This method is ideal for triangle and push points, especially when working with wood frames.
- Hold a glazier point flat against the glass where it meets the frame.
- Use a putty knife or small blade to press the point into the wood gently.
- Ensure the point is tight enough to hold the glass but not so tight that it risks cracking it.
- Install at least two glazier points per side for small panes, and more for larger ones.
Using a Glazier Point Driver
This tool is ideal for professionals or those who frequently work with window repairs.
- Load glazier points into the point driver as per the manufacturer’s instructions.
- Align the driver with the glass edge and press the tool against the sash.
- Squeeze the trigger or apply pressure to insert the point into the frame.
- Check that the point is flush with the wood and evenly spaced along the edge.
Alternative Methods
For screw-type or diamond points, use a small hammer or press tool to drive the point into the wood. Be cautious not to tap too hard to avoid breaking the glass. If the glass is thick or heavy, increase the number of points for better support.
Tips for Effective Use
Spacing the Points
Proper spacing ensures the pane stays in place securely. For small panes, 2-3 points per side is usually enough. For larger windows, place a point approximately every 6 inches along each edge. Always insert points symmetrically to balance pressure.
Handling the Glass
Always wear gloves when working with glass. Handle it by the edges and never put pressure on the center. If the pane is large, have someone help you hold it in place while inserting the points.
Checking for Stability
Once all points are installed, gently press on different areas of the glass to ensure it doesn’t shift. There should be slight pressure holding it in place but not enough to distort or crack the glass.
Sealing with Glazing Compound
Applying the Putty
After the glazier points are in place, apply a smooth bead of glazing compound around the glass edge to seal and secure it. Use a putty knife to shape the compound neatly and ensure no gaps remain. Let the compound cure as per manufacturer instructions.
Painting Over the Putty
Once the putty has hardened, it’s recommended to paint over it for added protection from moisture and weather. Use a good-quality exterior paint and apply a thin, even coat.
Common Mistakes to Avoid
Overdriving the Points
Pressing glazier points too hard or too close to the edge can cause glass breakage. Insert them gently and always maintain even pressure.
Too Few Points
Using too few glazier points may not provide enough support, especially for larger panes. Distribute points evenly on all sides to ensure safety and durability.
Skipping Putty Application
Glazier points alone are not enough to seal a pane. Skipping the putty will allow air and moisture to enter, leading to drafts, leaks, or frame damage.
When to Replace Glazier Points
Window Restoration
When restoring old windows, always inspect existing glazier points. Rusty, bent, or loose points should be removed and replaced with new ones. Carefully scrape away old putty, insert fresh points, and reapply new compound.
Broken or Loose Glass
If the glass moves or rattles in the frame, it could be a sign of missing or damaged glazier points. Secure the pane again with properly installed points and reseal with putty.
Learning how to use glazier points correctly is a valuable skill for anyone involved in glass installation, window restoration, or picture framing. With the right tools, careful handling, and attention to detail, glazier points provide a simple yet highly effective way to secure glass panes in place. Always follow best practices, use safety gear, and take your time during each step of the process. Whether you’re a professional glazier or a DIY enthusiast, mastering this technique will help ensure long-lasting, secure, and visually pleasing results for all your glazing projects.