Calculate Liner Size
Ethylene Propylene Diene Monomer, EPDM, is a flexible material that can easily conform to any configurations you choose. When selecting a liner, make sure to get one that is meant for ponds. Unfortunately, pool liners or roofing material often get experimented with and pond owners learn a hard lesson. These materials often are constructed with chemicals to reduce algae or mold that can be harmful to fish and they may tear easily. Instead, stick with LifeGuard 45 mil EPDM Pond Liner. It is safe for fish, plants, and wildlife and is the ideal product to give your feature a natural look.
Start by getting the measurements for the longest, widest, and deepest points of your pond or pond to be. Next punch these numbers into the calculator: (Length + (2 x Depth + 1)) by (Width + (2 x Depth + 1)). Lets brake this down an example for a pond that is 10′ long, 5′ wide, and 3′ deep:
- Double the pond’s depth: 2 x 3′ = 6′
- Add 1′ extra for anchoring the liner: 6′ + 1′ = 7′
- Determine length: 10′ + 7′ = 17′
- Determine width: 5′ + 7′ = 12′
This means your liner would need to be at least 12′ x 17′. Since LifeGuard liners are sold in precut sizes, you will want to order the 15′ x 20′ liner. If in doubt when selecting a liner, opt for a larger one. It will give you some extra room to work with or allow you to expand your project.
Do not forget the UnderGuard Geotextile Underlayment! Underlayment is a soft polypropylene non-woven fabric that protects your liner from sharp objects. This will go under any surface the pond liner will be placed, but you do not need to seam it making the job easy. if your underlayment is 10′ wide, then you can size it by:
- Multiplying length and width of the liner: 15′ x 20′ = 300′
- Dividing by the width of the underlayment: 300′ / 10′ = 30′