Box Welded Liner 1mm Butyl - Create your own

The go-to pond liner for serious water gardeners — trusted for decades, backed by a 25-year guarantee.

When it comes to creating the perfect koi pond or water feature, there's one material professionals keep coming back to: 1mm butyl rubber. Our Custom Box Welded Butyl Pond Liners are precision-engineered to the exact dimensions of your pond, delivering a flawless, fold-free finish that standard flat liners simply can't match.

Butyl rubber has been the benchmark in pond lining for over 40 years — recommended by leading European water gardening experts and installed in hundreds of thousands of ponds across the world. Its unrivalled elasticity, UV stability, and resistance to temperature extremes make it the undisputed choice for long-lasting, low-maintenance pond construction.

Why Choose Our 1mm Butyl Box Welded Pond Liner?

Precision-Made to Your Dimensions

Every liner is produced to order, cut and welded exactly to your specified measurements. No awkward folds, no guesswork — just a perfect fit from day one.

Fully Welded Corners & Flanges — No Site Joins Required

Our box welded construction means all corners and top lip flanges are factory-welded to a professional standard, eliminating the risk of on-site leaks. A standard top flange is included as default (specify your flange size, or enter 0mm if not required).

Durability You Can Rely On

• Higher UV stability — won't degrade in sunlight
• Unaffected by temperature extremes, age, or ground movement
• Resists compressive loads and adapts to the substrate
• Superior tear and tensile strength versus EPDM and PVC alternatives
• Does not shrink, lose weight, or become brittle over time

Chemically Safe & Pond Life Friendly

Our 1mm butyl liner contains no plasticisers or additives — meaning zero leaching into your water. Completely safe for fish, plants, and all aquatic life. Chemically stable when in contact with soil chemicals and surrounding materials.

Relaxed Fit Installation

Unlike stretch-to-fit alternatives, our box welded liners are designed to sit with a relaxed fit — no stress on the material, no weak points, and maximum long-term life expectancy.

Can Be Vulcanised

Need to extend or repair? Butyl rubber can be vulcanised, making future modifications straightforward and preserving the integrity of the liner throughout its lifetime.

Professional Grade Underlay — Don't Risk Your Warranty

When placing your order, you'll be asked whether you'd like to add our professional grade 260gsm geotextile underlay. This isn't an optional extra to skip lightly — failure to use an underlay will invalidate your 25-year guarantee.

Our 260gsm underlay is specifically selected to provide a robust protective layer between your butyl liner and the pond structure, guarding against:

• Puncture from sharp stones, grit, or aggregate
• Root penetration over time
• Abrasion from rough concrete or block surfaces
• Ground movement stress on the liner base

Fitting the underlay takes minutes and adds years to the life of your liner. We strongly recommend selecting Yes when prompted at checkout.

25-Year Guarantee — Buy Once, Build for Life

We stand behind the quality of our butyl pond liners with a comprehensive 25-year guarantee. To keep your guarantee valid, your liner must be installed with our professional grade 260gsm geotextile underlay. When you invest in a box welded butyl liner — and protect it correctly — you're investing in a pond that will serve you for generations.

Quick Installation, Long-Term Performance

Designed to be installed into concrete block or timber pond structures, our box welded liners make installation quick and straightforward — simply lower into position and secure. No specialist skills required, no site joining, and no stress.

Recommended Use: Concrete block, timber frame, or raised pond structures. Not intended as a standalone tank.

Key Features at a Glance

• 1mm premium butyl rubber construction
• Made-to-measure to your exact pond dimensions
• Fully welded corners and flanges — zero site joins
• Perfect fold-free fit into your pond
• UV stable, temperature resistant, and age-resistant
• No plasticisers — safe for fish and plants
• Superior tear and tensile strength
• Can be vulcanised for future repairs or extensions
• Quick and simple installation
• Optional professional grade 260gsm geotextile underlay (required to maintain guarantee)
• 25-year guarantee

Order your custom box welded butyl pond liner today and join the thousands of water gardeners who've made butyl their liner of choice — for good reason.

Can Be Repaired?

Need to extend or repair? Butyl rubber can seamed by using MyPond Ms300 or be vulcanised, making future modifications straightforward and preserving the integrity of the liner throughout its lifetime.

25-Year Guarantee — Buy Once, Build for Life

We stand behind the quality of our butyl pond liners with a comprehensive 25-year guarantee. When you invest in a box welded butyl liner, you're investing in a pond that will serve you for generations.

Quick Installation, Long-Term Performance

Designed to be installed into concrete block or timber pond structures, our box welded liners make installation quick and straightforward — simply lower into position and secure. No specialist skills required, no site joining, and no stress.

Recommended Use: Concrete block, timber frame, or raised pond structures. Not intended as a standalone tank.

For best results, protect your liner with a quality geotextile underlay on all surfaces.

Key Features at a Glance

• 1mm premium butyl rubber construction
• Made-to-measure to your exact pond dimensions
• Fully welded corners and flanges — zero site joins
• Perfect fold-free fit into your pond
• UV stable, temperature resistant, and age-resistant
• No plasticisers — safe for fish and plants
• Superior tear and tensile strength
• Can be vulcanised for future repairs or extensions
• Quick and simple installation
• 25-year guarantee

Order your custom box welded butyl pond liner today and join the thousands of water gardeners who've made butyl their liner of choice — for good reason.

 

Frequently Asked Questions

What is a box welded pond liner?
A box welded pond liner is a custom-made liner factory-cut and welded at the corners to perfectly match your pond's exact dimensions. Unlike flat sheet liners that require folding on-site, a box welded liner drops in cleanly with no pleats or folds — giving a neat, professional finish and reducing stress on the material.

Why is 1mm butyl rubber the best material for pond liners?
1mm butyl rubber is the premium choice for pond lining. It offers exceptional elasticity, UV resistance, and temperature tolerance that EPDM and PVC alternatives can't match. Butyl contains no plasticisers or additives — no risk of chemicals leaching into your water — making it completely safe for fish and plants. The material of choice for water gardening professionals for over 40 years.

How long will a butyl box welded pond liner last?
Our liners come with a 25-year guarantee. Butyl rubber does not shrink, become brittle, or degrade with UV exposure or age. With proper installation and care, many butyl liners remain fully functional well beyond the guarantee period.

What size do I need?
Every liner is made to order. You'll need the internal length, width, and depth of your pond structure. Get in touch if you need help calculating your dimensions before ordering.

Can I specify the flange (top lip) size?
Yes. A top flange is included as standard and can be made to any size you specify. If no flange is required, enter 0mm when ordering.

Is it suitable for a koi pond?
Absolutely. The precision fit eliminates folds where debris can accumulate, the butyl is completely fish safe, and the durability keeps your pond environment stable for years. Must be installed into a concrete block or timber frame structure.

Can it be used as a standalone tank?
No. Box welded pond liners are designed to be installed into a rigid structure such as concrete block or timber-built ponds. They are not self-supporting standalone tanks.

Do I need an underlay?
Yes. We recommend a quality geotextile underlay on all contact surfaces to protect against puncture from stones or roots and to extend the life of the liner.

Can the liner be repaired if damaged?
Yes. Butyl rubber can repaired using MyPond Ms300 or be vulcanised, meaning it bonds and repairs effectively. Butyl-to-butyl bonds are extremely strong and watertight.

How is it delivered and installed?
Made to order and delivered folded for easy handling. Simply lower into your prepared pond structure, unfold into position, and secure the flange. No specialist tools or skills required.