Gas strut windows are designed to combine functionality, modern aesthetics, and effortless operation. Commonly used in outdoor kitchens, pass-through serving areas, bars, cafés, and entertainment spaces, these windows create a wide opening while allowing the sash to remain securely open using gas struts.
Correct installation is essential to ensure smooth operation, reliable weather sealing, structural stability, and long-term durability. Whether you’re installing a standard-size or custom-made gas strut window, following the proper installation process will help you achieve the best possible performance.
This guide provides a general overview of the installation process. While experienced builders may be familiar with window installations, professional installation is recommended, particularly for larger or custom gas strut windows.
Before You Begin
Before starting the installation, inspect the window thoroughly to ensure all components have arrived in good condition.
Check the following:
- Window frame
- Window sash
- Gas struts
- Hinges
- Handles
- Locking hardware
- Glass
- Installation accessories
- Fasteners and fixings
If any component is damaged or missing, contact your supplier before beginning installation.
Tools You’ll Need
Having the correct tools makes installation safer and more efficient.
Recommended tools include:
- Tape measure
- Spirit level
- Drill and drill bits
- Impact driver
- Screwdrivers
- Silicone sealant
- Sealant gun
- Rubber mallet
- Packers and shims
- Utility knife
- Safety gloves
- Safety glasses
- Ladder (if required)
Always use fixings suitable for the wall material, whether timber, masonry, steel, or concrete.
Prepare the Opening
The structural opening should be fully prepared before positioning the window.
Confirm that:
- Measurements match the manufactured window.
- The opening is square.
- The sill is level.
- Structural supports are complete.
- The opening is clean and free from dust or debris.
- Existing sealants have been removed in replacement projects.
Proper preparation helps ensure an accurate fit and simplifies the installation process.
Position the Window Frame
Carefully lift the frame into the structural opening.
Before securing the frame:
- Centre the frame evenly.
- Maintain equal clearance around all sides.
- Support the frame with packers where required.
- Check that the frame remains level and plumb.
A spirit level should be used throughout this stage to confirm accurate alignment.
Avoid forcing the frame into position, as this can affect the operation of the window.
Secure the Frame
Once the frame has been aligned correctly, secure it using the recommended fixing points.
As you install each fixing:
- Recheck the level.
- Confirm diagonal measurements.
- Ensure the frame has not twisted.
- Maintain consistent spacing around the frame.
Do not overtighten the fasteners, as excessive pressure may distort the frame and affect the operation of the sash.
Install the Window Sash
After the frame has been secured, install the window sash following the manufacturer’s recommended procedure.
Carefully position the sash onto the hinges while ensuring:
- Hinges align correctly.
- The sash opens freely.
- Clearances remain consistent.
- There is no binding or rubbing against the frame.
Because gas strut windows often contain large glazed panels, lifting should be performed safely by two people where necessary.
Attach the Gas Struts
Gas struts are the defining feature of this window system and should only be installed after the sash has been positioned correctly.
Attach each gas strut securely to its designated mounting points.
Once installed, test the operation by carefully opening the window.
The sash should:
- Open smoothly
- Remain securely in the open position
- Close evenly
- Operate without excessive force
If resistance or uneven movement is observed, inspect the installation before proceeding.
Check Alignment
Operate the window several times before completing the installation.
Confirm that:
- The sash opens smoothly.
- The window closes evenly.
- Locking hardware aligns correctly.
- Gaps around the frame are consistent.
- Weather seals compress evenly.
Minor adjustments may be required before the installation is complete.
Install Handles and Locking Hardware
Install all supplied hardware according to the manufacturer’s instructions.
Verify that:
- Handles operate smoothly.
- Locks engage correctly.
- Keys turn freely (where applicable).
- Latches secure the sash firmly.
Properly adjusted hardware contributes to both security and weather resistance.
Apply Weather Seals and Sealant
Inspect all perimeter seals before applying exterior sealant.
Use a high-quality, exterior-grade silicone sealant around the outside of the frame where required.
Ensure that:
- All joints are sealed.
- Drainage paths remain unobstructed.
- Excess sealant is removed neatly.
Avoid blocking drainage holes, as they allow moisture to escape from the frame.
Perform Final Checks
Before placing the window into regular use, complete a thorough inspection.
Confirm that:
- ✔ Frame is level
- ✔ Window opens smoothly
- ✔ Gas struts support the sash correctly
- ✔ Locks engage securely
- ✔ Handles operate easily
- ✔ Weather seals fit properly
- ✔ Drainage holes remain clear
- ✔ Glass is clean and undamaged
A final inspection ensures the window is operating safely and efficiently before handover.
Installation Tips for Best Results
To achieve the best long-term performance:
- Install on a level structural opening.
- Use appropriate packers during alignment.
- Check the level frequently during installation.
- Protect the frame from scratches during handling.
- Remove protective films only after installation is complete.
- Test the sash multiple times before sealing the frame.
- Follow the manufacturer’s recommended torque for fixings.
Attention to detail during installation will improve the lifespan and reliability of the window.
Common Installation Mistakes to Avoid
Many installation problems can be prevented by avoiding these common mistakes:
- Incorrect measurements
- Installing into an uneven opening
- Failing to level the frame
- Overtightening fixings
- Blocking drainage holes
- Misaligning hinges
- Installing gas struts incorrectly
- Applying excessive sealant around drainage channels
Taking the time to install the window correctly helps minimise future maintenance and ensures smooth operation.
Should You Install a Gas Strut Window Yourself?
Smaller gas strut windows may be suitable for experienced DIY installers. However, professional installation is recommended for larger windows, custom-built units, and commercial applications.
Professional installers can ensure:
- Accurate frame alignment
- Safe handling of glazed panels
- Proper gas strut operation
- Compliance with local building regulations
- Manufacturer warranty requirements
Professional installation also reduces the likelihood of operational issues after installation.
Frequently Asked Questions
How long does it take to install a gas strut window?
Most residential installations can be completed within a few hours, while larger custom or commercial installations may require additional time depending on site conditions.
Can gas strut windows be installed in existing walls?
Yes. They can be installed in both new construction and renovation projects, provided the structural opening has been prepared correctly.
Do gas strut windows require structural support?
Yes. Because these windows are often larger and heavier than conventional windows, adequate structural support is essential for safe installation and long-term performance.
Can I install a gas strut window above an outdoor kitchen?
Yes. Gas strut windows are commonly used above outdoor kitchens, BBQ areas, home bars, and serving counters to create a convenient pass-through opening.
Should I hire a professional installer?
Professional installation is strongly recommended for large, custom, or commercial gas strut windows to ensure correct alignment, safe operation, and warranty compliance.
A properly installed gas strut window delivers more than just modern style—it provides effortless operation, improved ventilation, and a seamless connection between indoor and outdoor spaces. By carefully preparing the opening, ensuring the frame is level, correctly installing the sash and gas struts, and carrying out thorough final checks, you can maximise the performance and longevity of your investment.
Whether your project involves an outdoor kitchen, café, home bar, or custom entertainment space, following this installation guide will help ensure your gas strut window operates safely, efficiently, and reliably for years to come.
