39mm Pond Viewing Window – Toughened and Laminated Pond Glass UK
A 39mm pond viewing window is designed for large, wide viewing panels and demanding pond installations, where maximum stability and structural performance are required. It is commonly specified for deep koi ponds, wide-span viewing windows, and premium or architectural pond projects.
At Fusion Glass Ltd, we supply 39mm toughened laminated pond glass cut to size, with polished edges and reliable UK-wide delivery.
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What Is a 39mm Pond Viewing Window?
39mm pond glass is manufactured using multiple layers of toughened safety glass laminated together with high-performance interlayers, producing an exceptionally rigid and stable viewing panel.
This construction allows 39mm pond viewing window to manage significant water pressure across wider spans, making it suitable for installations where thinner glass would experience increased deflection.
The laminated build also improves safety by helping the panel remain intact in the unlikely event of damage.
Buy pond glass today!
We stock a range of common sizes in our store, but can supply any size of pond glass that you need. For bespoke orders, custom glass specifications, please get in touch via phone, email or the contact form.
Pond Viewing Window Thickness Comparison
Typical maximum recommendations. All figures assume correct installation into a suitable structural rebate with full edge support.
21.5mm
Max panel depth: Up to 400mm (16 inches)
Max panel width: Up to 1600mm (63 inches)
Best suited for: Shallow garden ponds, sleeper ponds, decorative or wildlife ponds
25.5mm
Max panel depth: Up to 600mm (24 inches)
Max panel width: Up to 2000mm (79 inches)
Best suited for: Medium-depth ponds, koi ponds, raised sleeper ponds
33mm
Max panel depth: Up to 1000mm (39 inches)
Max panel width: Up to 2000mm (79 inches)
Best suited for: Deep koi ponds, large raised ponds and projects requiring increased strength
39mm
Max panel depth: Up to 1000mm (39 inches)
Max panel width: Up to 3000mm (118 inches)
Best suited for: Very wide viewing panels, deep ponds and high-end or showcase installations
44.5mm
Max panel depth: Up to 1200mm (47 inches)
Max panel width: Up to 3500mm (138 inches)
Best suited for: Large, deep water features and specialist or commercial pond installations
Important notes:
Sizes shown are indicative and depend on panel proportions and installation method.
All pond viewing windows should be toughened, laminated and heat soaked.
Final thickness selection should always be confirmed before manufacture.
A 39mm pond viewing window is typically chosen when panel width and visual impact are key design considerations, rather than depth alone.
It is particularly well suited to:
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Wide viewing windows
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Large raised ponds
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Deep koi ponds with broad spans
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High-end or architectural pond designs
For narrower panels, 33mm pond glass may be suitable, while 39mm is preferred where width and stability are the priority.
Recommended Panel Sizes
The suitability of 39mm pond glass depends on panel width, depth, and installation method.
Typical recommendations for 39mm pond viewing windows are:
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Maximum panel depth: up to 1000mm (39 inches)
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Maximum panel width: up to 3000mm (118 inches)
These guidelines assume installation into a structurally sound rebate with full edge support on all sides.
39mm Compared With Other Pond Glass Thicknesses
Compared with 33mm pond viewing windows, 39mm offers increased rigidity across wide spans, helping to minimise deflection in large viewing windows.
Compared with 25.5mm pond glass, 39mm is intended for substantially larger or more complex pond designs where panel width plays a greater role.
Selecting the correct thickness ensures safety, performance, and visual quality over the lifetime of the installation.
All 39mm pond viewing windows supplied by Fusion Glass Ltd are manufactured to a premium safety specification and supplied as:
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Toughened
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Laminated
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Heat soaked
Edges are fully polished for safety and clarity, with dubbed corners supplied as standard to reduce stress concentrations during installation.
This specification ensures long-term reliability in large or demanding pond environments when installed correctly.
Pond Glass Delivery & Lead Times
Fusion Glass Ltd supplies 39mm pond viewing windows across the UK, providing reliable nationwide delivery for domestic and trade customers.
Typical lead times are approximately 10–15 working days from order confirmation. During busy periods, lead times may extend, so we recommend ordering well in advance to suit your project timeline.
Once your glass is ready, we will contact you to confirm delivery scheduling.
Delivery Times, Access & Offloading
Deliveries are made Monday to Friday between 07:30 and 17:30. Please ensure someone is available on the delivery day, and ideally the following day, to receive the glass.
All pond glass is delivered kerbside only. Suitable access must be available for the delivery vehicle.
Due to the weight of glass panels, at least two people are required for every 85kg of glass to safely offload. Glass is delivered unwrapped, and customers are responsible for safe handling once offloaded.
Delivery Areas & Additional Charges
We offer nationwide delivery across the UK. Additional delivery charges may apply for the following postcode areas:
AB, BT, CT, DD, DG, EH, FK, G, IV, KA, KW, KY, ML, PA, PH, PL, TD, TN23–TN30, TR
If your delivery address falls within one of these postcode areas, please contact us before ordering so delivery costs can be confirmed.
Inspection on Delivery
All pond glass must be checked immediately upon delivery before signing. Any damaged or defective glass must be reported and rejected at the time of delivery.
Order Accuracy & Amendments
Please ensure all sizes, thicknesses, and specifications are correct before confirming your order.
Cancellations or changes can be made within 48 hours of placing your order. After this period, the glass will be cut to size and no changes or refunds can be accepted.
Frequently Asked Questions – 39mm Pond Glass
Is 39mm pond glass suitable for wide viewing windows?
Yes, 39mm is commonly specified for wide viewing panels where minimising deflection is important.
Can 39mm glass be used in deep koi ponds?
Yes, it is suitable for deep koi ponds, particularly where large viewing windows are required.
Do you supply 39mm pond glass cut to size?
Yes, all 39mm pond viewing windows are supplied cut to your required dimensions.
Fusion Glass Ltd is a UK specialist supplier of pond viewing windows, supplying glass cut to size for bespoke pond projects.
We provide clear technical guidance to help ensure the correct thickness is selected for your design.
Nationwide delivery is available on all pond glass products.
Get a Quote for a 39mm Pond Viewing Window
If you’re planning a large or visually striking pond and believe 39mm pond glass is suitable for your project, get in touch with us today.
Please provide your required glass size, pond depth, and construction method so we can confirm suitability.
We’ll provide a clear, no-obligation quotation.