Yes, it is possible to buy a pond liner cut to the needs of your project. However, the term "by the meter" warrants verification: depending on the product page, the quantity ordered may refer to a length or an area. Confusing the two can lead to receiving a piece that is too small.
On the product page for the Aquitechnics EPDM liner offered by Aquishop, the quantity is expressed in square meters. You must therefore determine the width and length of the sheet, then multiply these two dimensions. Here is how to prepare an order that is consistent with your pond.
Linear meter and square meter: two different units
A linear meter corresponds to one meter of length within a given width. If a roll is four meters wide, a length of five meters represents twenty square meters of membrane.
A price per square meter relates directly to the surface area. In the same example, you must account for twenty surface units if the page indicates that one unit corresponds to one square meter. The chosen width remains necessary to know in what form this surface area will be delivered.
| Width of the piece | Length of the piece | Surface area |
|---|---|---|
| 4 m | 5 m | 20 m² |
| 6 m | 5 m | 30 m² |
| 6 m | 8 m | 48 m² |
These examples explain the calculation; they do not constitute a list of available formats. Before confirming your cart, check the width actually offered, the cutting length, and the unit used for the quantity.
Why the surface area of the water mirror is not enough
A pond measuring four meters by two has eight square meters of surface area when viewed from above. However, its liner must descend along the banks, cover the bottom, and rise up on the other side. You must also maintain a reserve for finishing.
Depth therefore strongly influences the dimensions to purchase. A small, deep pond may require a much larger sheet than its footprint suggests.
Measure the maximum length, maximum width, and maximum depth of the project. Use the planned water level as a reference and note the measurements on a sketch. Shelves, irregularities, and any potential connections must appear on this drawing.
The formula for an initial estimate
The Aquitechnics product page uses the following reference:
- Liner length = maximum pond length + twice the maximum depth + one meter.
- Liner width = maximum pond width + twice the maximum depth + one meter.
The added meter here corresponds to fifty centimeters of margin on each side. This reserve must be adapted to the specific bank detailing planned. An anchor trench, a particular finish, or a connection to a waterfall may require a different arrangement.
For a complex shape, have the dimensions confirmed. The formula serves as a preparation estimate; the finished site survey and the installation plan allow you to validate the final piece.
Example: a four-meter by two-meter pond
Let's take a pond 4 m long, 2 m wide, and 0.80 m deep at its maximum, with the margins indicated above.
- Estimated length: 4 + 1.60 + 1 = 6.60 m.
- Estimated width: 2 + 1.60 + 1 = 4.60 m.
- Corresponding theoretical surface area: 6.60 × 4.60 = 30.36 m².
The width of 4.60 m is not necessarily a roll width. If the selected width is 4.88 m, a 6.60 m piece represents 32.208 m². The invoiced quantity and rounding options must be confirmed with the seller before cutting.
This example shows why you must communicate two dimensions, and not just a number of square meters. Two pieces with the same surface area can have very different proportions.
Measure one last time after earthwork
The designed project and the finished hole are not always identical. A widened shelf or a deepened area can change the requirements. Therefore, take the measurements again before having the membrane prepared.
To check the profile, a flexible rope can follow the bottom and the shelves between the future bank finishes. Compare this survey to the calculated dimensions and examine the most demanding areas. If multiple depths or angles complicate the reading, ask for a validation of the plan.
Keep a copy of the agreed dimensions and the reference ordered. You will easily find this information during delivery, and later when choosing any compatible accessories.
Which liner to choose for a fish pond?
Choose a membrane explicitly intended for ponds and compatible with fish and plants. The designation EPDM describes a family of materials; it is not enough to identify all the characteristics of roofing products or other uses.
The Aquitechnics EPDM liner sold by the square meter is presented on Aquishop with an announced minimum thickness of 1.1 mm and several widths. Check the variants when preparing your order.
For a simple project, a single sheet avoids having to perform assembly on-site. Large works and particular shapes may require seams, to be designed with the system recommended for the membrane in question.
Plan for the felt and installation details
The membrane ensures watertightness; the preparation of the base and the protective layer contribute to preserving it. Remove sharp elements and correct irregularities before laying the lining.
The Aquitechnics EPDM pack with 400 g/m² felt allows you to plan for these two elements together. If you order the felt separately, its packaging and overlaps must also be taken into account.
Felt does not exempt you from preparing the ground. Problematic roots, protruding stones, and soil movement require a response adapted to the site.
Finally, list the pipe penetrations, the skimmer, any potential bottom drain, and the waterfall intake. These details must be compatible with the membrane; they cannot be resolved simply by adding a few square meters.
Receipt and installation: keep the right margin
Plan for access for delivery and handling of the sheet. A large piece of EPDM becomes heavy and bulky. The estimated weight should be calculated before the installation day.
Unfold the membrane on a prepared base, without dragging it over gravel. Let it settle into place gradually and follow the installation instructions. Bank finishing is prepared with the planned reserve; do not cut the overhangs too early.
Information to send before ordering
Prepare a sketch with the length, width, depths, and desired margins, as well as some photos of the access and the earthwork. Add the equipment that will pass through the membrane and the presence of any waterfall.
Consult the Aquitechnics EPDM liner then send your measurements to support@aquiflor.com to have the format and quantity confirmed. This verification prevents a simple confusion of units from complicating the creation of the pond.
Sources and references
- Aquishop product pages for the Aquitechnics liner, the pack with felt, and the protective felt, linked in the article.
- Elevate — PondGard presentation and calculation and installation principles.
- Elevate — PondGard design and installation guide.
- Elevate — EPDM membranes for decorative ponds.
