Proper ventilation is required. This is a soft, felt like fabric that is very strong and lightweight. This product will not mold or mildew under your liner, and will let water pass through it. We recommend this product for underlayment before installing your liner if your ground has any sharp edges that will over time wear on certain spots on the liner. Underlayment 4 oz.
All pond liners are custom fabricated for our customers.
Field Lining Systems, Inc. cannot return money on liners that the customer has already ordered. We are not responsible for damage done to the liner by misuse, acts of God.