10 x 10 Pond Underlayment Uses for Underlayment: pond installation, landscaping, drainage fabric, erosion control and more This 6oz underlayment increases puncture resistance of 45mil pond liner by 400% Can be used as a heavy duty weed barrier for landscaping Can be used as separation fabric when paving, and gravel applications Fabric has extreme tolerance of Hydrocarbons, Freeze-thaws cycles, mildew and rot