45-Mil EPDM Pond Liner Kit 15×20 ft with Protective Underlayment

Stop guessing about waterproofing your backyard water feature with this complete 15-foot by 20-foot pond liner kit. Engineered from solid 45-mil EPDM rubber and paired with a nonwoven protective underlayment, this set delivers a continuous, seamless barrier built for long-term aquatic environments.

Measuring 15 feet wide by 20 feet long, the liner provides up to 300 square feet of coverage, giving you ample excess to drape into custom depths or irregular shapes. Unlike thin vinyl sheets that split during installation, this EPDM membrane maintains flexibility across wide temperature swings, resisting freezing stress and preventing the brittleness that causes premature failures. The included nonwoven felt layer cushions the liner against sharp edges, roots, and drainage gravel, while smoothing out ground imperfections to eliminate stress points.

Fabrication specs back up the durability claims. The 45-mil thickness pairs with a tear strength of 25 kN/m and a tensile strength of 9 MPa, ensuring the material stretches securely along pond walls without tearing during positioning. EPDM synthetic rubber blocks UV degradation and resists rot, algae growth, and chemical breakdown from garden runoff or fish waste. This means less water evaporation tracking, fewer liner replacements, and a stable habitat for koi or native wildlife.

• Precision Dimensions: 15 ft × 20 ft sheet covers standard rectangular footprints and allows extra material for diagonal corners and depth adjustments.
• Reinforced Protection: Dedicated nonwoven underlayment cushions the liner and isolates it from abrasive soil and sharp rocks.
• Weather-Tight Sealing: Synthetic EPDM resists sun cracking, freeze-thaw cycles, and chemical exposure while maintaining elasticity year-round.
• Proven Load Ratings: 25 kN/m tear resistance and 9 MPa tensile strength handle heavy water pressure and rough handling during setup.

Drop the underlayment first, smooth it against your excavation base, lay the EPDM sheet over the top, and secure the perimeter with river stones or heavy plant pots. This bundled kit removes the guesswork from pond construction while delivering verified structural strength for reliable fish ponds, landscape waterfalls, and garden ecosystems.

Build Your Pond with Ease: This 15 ft x 20 ft pond liner combo includes one 45-mil EPDM pond liner and one protective underlayment. It is easy to get started on backyard ponds, landscape ponds, or small ecosystem ponds

Thick Protective Underlayment: The pond liner for outdoor ponds comes with a nonwoven fabric underlayment that helps reduce puncture and damage risks. It creates a smooth surface, extending the pond liner’s service life

Built for Outdoor Weather: This EPDM pond liner handles sun exposure, rain, snow, and temperature changes without cracking. It stays flexible, reduces water leaks, slows aging, and helps lower the need for frequent refilling or liner replacement

Tear-Resistant & Wear-Resistant: With a 45-mil thickness, this EPDM pond liner is built to resist punctures and tearing. Featuring a tear strength of 25 kN/m and tensile strength of 9 MPa, it handles tough outdoor conditions and fits different pond shapes