Heavy-Duty Pond Underlayment, 8' x 10' The Aquascape Heavy-Duty Pond Underlayment 8' x 10' (2.4 m x 3 m) covers small backyard pond builds and compact koi features where the 5' x 10' piece is too narrow for the pond profile. The 8-foot width accommodates wider oval and kidney-shaped pond designs that a 5-foot piece cannot span. Spec Value Dimensions 8' x 10' (2.4 m x 3 m) Coverage 80 sq ft (7.4 sq m) Material Non-woven geotextile How to Use Prepare the excavation surface, removing sharp rocks and roots. Lay the underlayment over the substrate, conforming it to the contours. Overlap with adjoining pieces by at least 6" (15 cm) if the pond requires multiple sections. Lay EPDM liner on top. Fill and trim excess at the edges after the liner seats. Ideal for small-to-medium backyard pond builds and wider compact water features where the 5' width is insufficient and a single 8' x 10' piece covers the pond floor and lower wall sections without seaming.
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