Accurate measurements are critical when it comes to fitting or replacing double glazed windows. Whether you’re undertaking a DIY project or working with professionals, understanding how to measure double glazed windows ensures a proper fit, leading to better insulation, reduced energy costs, and improved comfort.
This guide will walk you through everything you need to know about measuring double glazed windows, from tools and steps to tips for accuracy.
Why Measure Double Glazed Windows?
- Perfect Fit: Double glazing units need to fit snugly within the frame. Improper measurements can lead to gaps, drafts, and air leaks, compromising energy efficiency.
- Energy Efficiency: Accurate measurements ensure that your new windows will perform at their best, providing insulation to reduce heating and cooling costs.
- Prevent Water Leakage: A misfit can result in water seepage around the window, leading to potential mould growth and damage to the surrounding wall and frame.
- Aesthetic Appeal: Correct measurements mean the new windows will look good in place, aligning properly with the surrounding areas.
Tools You Will Need To Measure Double Glazed Windows
- Tape Measure: A retractable tape measure is a must. Use one with a length of at least 5 meters to measure both small and large windows.
- Spirit Level: This helps you check whether the window frame is straight (horizontal and vertical).
- Pencil and Paper: To record measurements as you go.
- Carpenter’s Square: If you’re measuring a non-rectangular window or want to ensure angles are 90°.
- Helper (Optional): A second person can help hold the tape measure and assist in getting the correct measurement for larger windows.
How To Measure Double Glazed Windows: Step-By-Step Guide
Now that you’ve got the right tools, let’s go through the step-by-step process for measuring double glazed windows.
Step 1: Measure The Window Frame Width
Start with the width of the window frame. You’ll need this measurement to ensure that the new window unit will fit perfectly.
- Measure at Three Points: Take measurements at the top, middle, and bottom of the window frame. Window frames can sometimes be out of square, so measuring at multiple points ensures you get the most accurate result.
- Use the Smallest Measurement: Always use the smallest of the three measurements to ensure the window fits into the smallest gap in the frame.
Step 2: Measure The Window Frame Height
Next, measure the height of the window frame. This is just as important as the width for a proper fit.
- Measure at Three Points: Measure the height at the left, right, and middle of the frame.
- Use the Smallest Measurement: Again, take the smallest of these three measurements to ensure the window will fit well.
Step 3: Measure The Diagonal
To check if the window frame is square, measure the diagonals.
- Measure the Diagonal from Corner to Corner: Measure from one corner of the frame to the opposite corner, then measure from the other corner to the opposite one.
- Compare the Measurements: If the two diagonal measurements are the same, the frame is square. If they are not, the frame might be out of square, which could affect the window fit.
Step 4: Measure The Depth Of The Window Frame
The depth of the window frame is the distance from the back of the frame to the front edge. This is important for ensuring the double glazing unit fits well and doesn’t stick out.
- Measure from the Back to the Front: Use your tape measure to check the frame’s depth.
- Check for Obstructions: Make sure nothing, such as external cladding or internal moulding, will interfere with the depth measurement.
Step 5: Measure For The Double Glazed Unit
The double glazing unit itself consists of two panes of glass with a spacer bar between them. You need to measure this unit to ensure it fits into the window frame.
- Measure the Width: Measure the distance between the glazing beads (the strips of material that hold the glass in place) to determine the width of the glazing unit.
- Measure the Height: Similarly, measure the distance between the beads on the vertical sides to determine the height of the glazing unit.
- Account for the Spacer Bar: The spacer bar is typically around 10-16 mm in width, so ensure you measure it and include it in your overall measurements.
Step 6: Account For Additional Features
If your window has sills, lintels, or shutters, make sure to account for these additional features when measuring.
- Measure Sills and Lintels: If your window features a sill or lintel, measure from the frame to the edge of these features to ensure the window will fit without obstruction.
- Consider Shutters and Blinds: If there are any internal or external features like shutters or blinds, make sure these won’t block the installation of the new window.
Tips For Accurate Window Measurements
While the steps above provide a good foundation, here are some additional tips to ensure your measurements are spot on.
1. Measure In Millimetres
For more precise measurements, it’s recommended to measure in millimetres instead of inches. This will give you the most accurate fit, especially when dealing with small differences.
2. Measure Twice, Cut Once
Double-check your measurements before you finalise them. It’s always best to take a second measurement to ensure accuracy. Small mistakes can lead to costly errors later on.
3. Use A Helper
If possible, have a second person assist you while measuring, especially for large windows. One person can hold the tape measure in place while the other records the measurements.
4. Don’t Forget To Account For Expansion And Contraction
Materials can expand or contract with temperature changes. Allow a small margin for this when measuring, especially if you live in an area with extreme weather conditions.
5. Consider Window Frame Irregularities
Older window frames may not be perfectly square or symmetrical. Always measure at multiple points and take the smallest measurement to ensure the best fit.
6. Don’t Rush
Rushing through the measurement process can lead to mistakes. Take your time, and recheck each measurement as you go. Getting accurate measurements the first time can save you time, effort, and money later on.
Common Mistakes To Avoid When Measuring Double Glazed Windows
While measuring double glazed windows, certain mistakes can compromise the fit. Avoid these common errors to ensure a smooth installation process.
1. Only Measuring One Point
Many people make the mistake of measuring the window frame at just one point. Always measure at multiple points along the top, bottom, and sides to ensure accuracy.
2. Ignoring The Diagonal Measurement
Failing to measure the diagonals is another common mistake. If the frame is out of square, your window might not fit properly. Always check the diagonals to confirm the frame is square.
3. Forgetting To Measure For The Glazing Unit
Some people focus solely on the window frame and forget to measure for the double glazing unit. Both the frame and glazing unit must be measured to ensure a proper fit.
4. Not Accounting For Obstructions
Don’t forget to measure any obstructions that might affect the fit, such as window sills, lintels, or internal features like shutters. These can impact the overall installation process.
Conclusion
Measuring double glazed windows may seem like a daunting task, but with the right tools and a step-by-step approach, it can be simple. By taking accurate measurements of the window frame, glazing unit, and surrounding features, you can ensure that your new double glazed windows will fit perfectly, providing improved energy efficiency and comfort. Measure multiple times, use the correct units, and account for all possible obstructions.
By following the tips and steps outlined in this guide, you’ll be well on your way to successfully measuring your double glazed windows, whether for a replacement or a new installation.
Frequently Asked Questions
How Do I Measure The Frame Of A Double Glazed Window?
Measure the width and height of the window frame from the inside edge of the reveal. Ensure you take measurements in three places—top, middle, and bottom for the width, and left, middle, and right for the height—to account for any frame irregularities.
Can I Measure Double Glazed Windows Myself, Or Should I Hire A Professional?
If you have basic DIY skills and the right tools, you can measure double glazed windows yourself. However, if the windows are large, or irregularly shaped, or if you’re unsure about your measurements, it’s advisable to hire a professional to ensure accuracy.
What Is The Standard Tolerance When Measuring Double Glazed Windows?
Typically, a tolerance of around 5mm is acceptable when measuring double glazed windows. This ensures the window can fit into the frame properly while still allowing room for expansion and contraction due to temperature fluctuations.
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