Why Accurate Measurement Matters
The most common window net problem is incorrect sizing. Nets that are too small leave gaps where insects enter. Nets that are too large sag, bunch, or don't attach properly. One careful measurement prevents both issues.
This guide walks through the exact steps to measure any window type so your net fits correctly the first time.
1. Identify Your Window Type
Different window styles require slightly different measuring approaches:
Single-Hung and Double-Hung Windows
- Standard vertical sliding windows.
- Measure the window opening, not the glass.
- Most common residential window type.
Casement Windows
- Windows that swing open on hinges.
- Measure the frame opening when window is closed.
- May need exterior mounting for full opening clearance.
Sliding Windows
- Horizontal sliding operation.
- Measure each panel separately if using individual nets.
- Or measure full opening for single large net.
Fixed Windows
- Non-opening windows.
- Simplest to measure and install.
- Nets can be permanently attached.
2. Measuring the Window Opening
Step 1: Measure Width
- Measure across the window opening at the top.
- Measure again at the middle.
- Measure once more at the bottom.
- Use the smallest measurement to ensure fit.
Step 2: Measure Height
- Measure from top to bottom on the left side.
- Measure again in the center.
- Measure once more on the right side.
- Again, use the smallest measurement.
Why Multiple Measurements?
Window frames are rarely perfectly square. Multiple measurements ensure your net fits the narrowest point, preventing gaps.
3. Choosing the Right Net Size
For Magnetic and Velcro Nets
- Order nets 1-2 inches larger than your measurements.
- Extra material ensures complete coverage and secure attachment.
- Excess can be trimmed if needed.
For Fixed Frame Screens
- Order exact size or slightly smaller for inside-mount frames.
- Frame should fit snugly within window opening.
- Outside-mount frames can be slightly larger.
For Roll-Up Screens
- Follow manufacturer's sizing guidelines precisely.
- Measure mounting space for hardware.
- Account for clearance when screen is rolled up.
4. Checking Mounting Surface
Magnetic and velcro nets need flat, clean surface area around the window:
Surface Requirements
- Flat area: At least 1 inch of flat surface on all sides.
- Clean surface: Free of dust, paint chips, or rough texture.
- Smooth finish: Adhesives stick best to smooth painted or finished wood.
- No obstructions: Clear of window cranks, locks, or decorative trim.
Problem Surfaces
- Heavily textured walls may not hold adhesive well.
- Peeling paint should be removed first.
- Very rough wood may need sanding.
- Metal frames may need special adhesive.
5. Special Considerations
Bay Windows
- Measure each section separately.
- Consider individual nets per section.
- Account for angled corners.
Arched Windows
- Measure the rectangular portion only.
- Arch top typically remains uncovered.
- Custom nets available for full coverage.
Sliding Glass Doors
- Measure full height from floor to top of frame.
- Consider door-specific magnetic screens.
- Account for door track clearance.
6. Common Measuring Mistakes
- Measuring glass instead of opening: Always measure the frame opening.
- Rounding measurements: Use exact measurements, don't round.
- Single measurement only: Always measure multiple points.
- Forgetting mounting space: Check surface area for attachment.
- Not accounting for obstructions: Note window cranks, locks, etc.
Double-checking measurements takes two minutes and prevents ordering the wrong size.
7. Recording Your Measurements
Write down:
- Window location (e.g., "bedroom north window")
- Width measurements (top, middle, bottom)
- Height measurements (left, center, right)
- Smallest width and height
- Window type and any special features
- Mounting surface condition
This record helps when ordering multiple nets or reordering in the future.