Heavy-Duty Pond Underlayment, 15' x 25' The Aquascape Heavy-Duty Pond Underlayment 15' x 25' (4.6 m x 7.6 m) is one of the larger pre-cut sizes, covering 375 sq ft (34.8 sq m) to suit large residential and semi-commercial pond projects where the pond floor-and-wall coverage area approaches or exceeds that of most pre-cut smaller pieces. Spec Value Dimensions 15' x 25' (4.6 m x 7.6 m) Coverage 375 sq ft (34.8 sq m) Material Non-woven geotextile How to Use Prepare the excavation surface. Lay the underlayment flat and conform to contours. Overlap adjacent sections by 6" (15 cm). Install EPDM liner and fill to seat. Trim excess at the edges after the liner seats against the excavation. Ideal for large-scale koi pond projects, commercial landscape water features, and large recreational ponds where the 15' x 25' piece covers the complete floor and lower wall zone without seaming through the centre of the installation.
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