If you’re working on a window repair or replacement project, one essential step is knowing how to measure tilt or non-tilt jambliners correctly. Jambliners, also called window liners, are crucial components that keep your sash balanced and ensure smooth operation. Measuring them accurately will save you time, money, and frustration when ordering replacements.

In this guide, we’ll break down what tilt and non-tilt jambliners are, why measuring matters, and a step-by-step process to get it right the first time.

What Are Jambliners?

Jambliners are vertical tracks installed inside the window jamb that help guide the sash up and down. They also house the balance system, which supports the weight of the sash.

• Tilt Jambliners: Designed for tilt windows, which allow you to tilt the sash inward for easy cleaning.
  
  

• Non-Tilt Jambliners: Used in older or traditional windows that don’t have a tilt-in feature.
  
  

Understanding which type of jambliner you have is the first step before measuring.

Why Accurate Measurements Matter

Getting the right measurements ensures:

• Smooth sash movement without sticking or wobbling.
  
  

• Proper balance and weight distribution.
  
  

• Avoiding costly reorders of incorrect parts.
  
  

Whether you’re a contractor, DIY enthusiast, or facilities manager, accurate measurements will make your window repair more efficient.

Tools You’ll Need:

Before you begin, gather these simple tools:

• A tape measure
  
  

• A notepad or phone to record dimensions
  
  

• The sash (for reference)

While jambliners control sash movement, they’re designed to work with specific glass and sash sizes. Measuring only the channel length may not give you the complete picture. Knowing the glass size helps ensure the correct sash weight balance and proper alignment between the sash, glass, and jambliner.

How to Measure Tilt or Non-Tilt Jambliners

Step 1: Remove the Sash

Carefully remove the sash from the window frame. This gives you full access to the jambliner and the glass.

Step 2: Identify the Window Type

• Tilt Window: Look for pivot bars and a tilt balance system.
  
  

• Non-Tilt Window: Only slides up and down, no tilt function.
  
  

Step 3: Measure the Jambliner Length

Measure from the very top of the jambliner channel down to the bottom. Round to the nearest inch (e.g., 31 ¾ inches = 32 inches).

Step 4: Measure the Jambliner Width (Optional)

Most jambliners use standard widths, but some vary. Measure across the face of the liner if needed.

Step 5: Measure the Glass

1. Lay the sash flat on a stable surface.
   
   

2. Measure the visible glass height (inside the sash, not including the frame).
   
   

3. Measure the visible glass width the same way.
   
   

4. Record these measurements to the nearest 1/16 of an inch.
   
   

Tip: Some suppliers may also want the overall sash size, which includes the sash frame plus the glass. Always check ordering requirements.

Step 6: Note Balance Weight Rating

For tilt jambliner balances, check for stamped numbers, colored tips, or manufacturer codes that indicate weight range. Non-tilt systems may use block-and-tackle or coil balances with their own ratings.

Pro Tips for Success

• Always measure both sides of the window to confirm consistency.
  
  

• Take note of any manufacturer markings or codes; they can simplify ordering.
  
  

• If your window is older, consider replacing both jambliners at once to ensure even performance.
  

Common Mistakes to Avoid

• Measuring with the sash still installed: This leads to inaccurate numbers.
  
  

• Ignoring tilt vs. non-tilt: Ordering the wrong style means a part that won’t fit.
  
  

• Not recording the balance rating: This can cause poor sash support and failure.
  
  

Conclusion

Learning how to measure tilt or non-tilt jambliners is a straightforward process, but precision is key. By removing the sash, identifying your window type, and carefully recording length and weight ratings, you’ll ensure a perfect fit for your replacement jambliners.

Whether you’re maintaining a home, school, or commercial building, the right measurement means smoother operation and longer-lasting windows. For more information, check out our Youtube Video on Installing Jambliners! If you still have questions, feel free to Contact Us! The WHD Team will be happy to help.