Heavy-Duty Pond Underlayment, 10' x 20' The Aquascape Heavy-Duty Pond Underlayment 10' x 20' (3 m x 6 m) covers large backyard pond floors and extended stream bed sections with a single piece. At 200 sq ft (18.6 sq m), it handles most large residential pond builds without requiring seaming over the primary pond floor area. Spec Value Dimensions 10' x 20' (3 m x 6 m) Coverage 200 sq ft (18.6 sq m) Material Non-woven geotextile How to Use Prepare the excavation and lay the underlayment flat over the substrate. Conform to contours and overlap adjacent sections by 6" (15 cm). Install EPDM liner on top and fill to seat both layers. Trim at the edges after the liner conforms to the excavation profile. Ideal for large backyard koi pond builds, extended waterfall stream beds, and recreational pond installations where a single 10' x 20' piece covers the pond floor and stream run without seaming joints.
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