The most affordable liner is 0 5mm thick pvc.
How thick plastic sheeting for pond.
Some refer to the thickness of plastic as gauge but a more precise term is mil.
See the chart below or just ask.
What is the plastic sheeting protecting.
However it does have its drawbacks.
For what period of time and under what conditions must the plastic hold up.
1 00mm recommended for all box welded pond liners fabricated for ornamental regular shaped ponds and flat sheet lined ponds where overlay protection is not suitable but extra durability is required due to the type of planting size of pond and exposure to visiting wildlife.
Great for those on a budget and easy to repair with a patch should it rip.
6 mil is a very common thickness for plastic sheeting but it can go all the way up to 100 mil.
Depending on the application will dictate how thick the plastic needs to be.
Visqueen also known as visquine is the brand name for polyethylene plastic sheeting.
In colder weather below 8 c it can become very brittle and tear if handled so try to avoid in pond maintenance during the winter season.
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Lining a pond with landscape plastic.
Not sure what thickness you need for your project.