This extremely strong non-woven, needlepunched Geotextile is an 8 oz Grade. It provides protection from roots & sharp objects. To protect pond liners a layer should be placed underneath the liner, it is often placed on top of the liner as well to protect the inside of the pond from sharp stones. It can also be used on top of liner for additional protection when placing large rocks.

Liner underlayer is available in 6' widths and 15' widths only. It can be as long as you need.

To Order Your Custom Cut
In the Available Options choose the under layer width you want. Then, enter the number of feet long you need in the quantity box marked Qty:.

Always order enough underlayer to fully cover your pond hole so the liner will have under layer underneath all surfaces.

Typically you will need the same number of square feet of geotextile under layer as you have square feet of liner. Because the under layer only comes in specific widths choose the best size so you can cut your under layer to create a perfect layer under your liner.

Calculating Pond Liner Requirements For Your Pond

To calculate the liner size you need for your pond you need to take into account the shape and if you are creating deep zones and shallow zones or interesting bean shaped ponds or adding waterfalls and cascades. It's always better to have a little extra liner than not enough. Use the following as a basic guide:

Length in Feet + Depth in Feet + Depth in Feet + 2 Feet = Length of Liner Required in Feet
Width in Feet + Depth in Feet + Depth in Feet + 2 Feet = Width of Liner Required in Feet

Example: If you want the size of your your pond to be 12 feet long by 14 feet wide by 3 feet deep, then:

Longest Length = 12 Feet
Widest Width = 14 Feet
Deepest Depth = 3  Feet

Calculate Liner Size

12' + 3' + 3' + 2' = 20’
14’ + 3' + 3' + 2' = 22’

So: For a 3 foot deep pond 12' x 14' you need a liner 20' x 22' and to have an appropriate under layer that works out to around 440 square feet so a piece 6' wide by 75' long would allow you to cut and fit the underlayer under your liner. Or for 440 square feet of liner you could get a 15' wide under layer piece that is 30 feet long. Better to have a bit extra than not enough!




Full rolls of under layer are available here.