Geotextile Fabric Underlayment - Custom Size

Whether you're building a new pond or reinforcing an existing one, the right underlayment makes a big difference. Our non-woven geotextile fabric is designed to shield your liner from punctures caused by sharp rocks, roots, and shifting ground. Both the standard and the heavy-duty offer strong, dependable protection with excellent permeability for proper drainage.

The standard is a versatile choice for most backyard ponds, balancing strength with flexibility for easier installation around shelves and curves. The heavy-duty steps up to a thicker, tougher fabric ideal for larger projects, rocky ground, or situations where maximum liner protection is needed.

Why Choose Geotextile Fabric Underlayment?

• Long-lasting protection: Prevents liner damage from rocks, roots, and soil movement.
• High strength: Withstands heavy loads and ground shifts without tearing.
• Water permeable: Allows water to pass through while keeping soil out.
• UV stable: Resists degradation from sun exposure during installation.
• Multiple grades: Choose W29 for standard builds or W36 for heavy-duty applications.

PRO TIP

For large or irregular ponds, overlap underlayment pieces by at least 6 inches and avoid stretching the fabric during installation. This maintains full coverage and prevents stress points that can shorten its lifespan.