Planter Waterproofing Liner



Our Planter Waterproofing Liner is a HDPE plastic sheet that is waterproof, puncture resistant, and smooth. You can use a standard utility knife to fit your planter's dimensions. This commercial grade product is available in 30-100 mil thickness options, and in various depths and will not rot or mildew, and is non-biodegradable.

The Planter Waterproofing Liner has a 100 year estimated material lifespan if not installed in direct sunlight. This product is made in the USA.

Material Thickness:
30 mil = 1/32”
40 mil = 3/64”
60 mil = 1/16”
80 mil = 5/64”
100 mil = 3/32”


"I was extremely happy with your product, it installs well, and is high quality."

- Eric, Beaverton, OR

A roll of 40 mil liner three feet wide was purchased to line four deep raised planter beds. Each bed measured 4' wide by 8' long and over 30" deep. The liner was cut to fit each side of the bed. It was secured to the walls with plastic cap nails. The corners were sealed with Vycor tape and the nails coated with Rustoleum rubber sealant. The liner was easy to work with and I am very satisfied with the quality of the material. Now I only need to fill with topsoil to enjoy some gardening!

- Winfield, Mullica Hill, NJ


Product Specifics

  • Material: High Density Polyethylene
  • Texture: Smooth
  • Size: Various Widths in 80' and 100' Lengths
  • Free Shipping
  • Need a Written Quote?
    Request Online > 
  • Volume Pricing Available - orders $6,500+
  • Questions? Call (800) 520-7731

Planter Liner Material

  • Waterproof
  • Commercial Grade
  • UV Resistant
  • Non-Biodegradable
  • Will Not Rot or Mildew
  • Resistant to Rodent and Insect Damage
  • 100 Year Material Lifespan
  • Made in the USA

All of our plastics are professional-grade and are designed for use in both residential & commercial applications. Our plastics are designed for years of continuous use in the designated application.

Connecting HDPE Pieces

There are two ways to connect multiple pieces of HDPE together. One method is to overlap the HDPE and use our double sided seam tape to connect the two pieces. The other method is to butt the ends together and use our 17 mil single sided seam tape to create a solid connection.


Overlap Method
(for underground installations)

The overlap method is best used when connecting two pieces of HDPE in a buried application. Due to the overlap, a ridge is exposed which is not ideal when installed in exposed vertical or flat installations in high traffic areas as there is a possibility of an object catching on the ridge and pulling the two pieces apart.

In a below ground installation, the large overlap area provides a more water resistant connection as well as enhanced protection against tree and plant root intrusion.

View Tape Pricing and Seaming Instructions >

End to End Method
(for exposed installations)

When installing HDPE on a wall, floor or anywhere that is exposed, the end to end method provides a secure connection and does not leave any ridges exposed to potential catching by a person or object.

View Tape Pricing and Seaming Instructions >


  • All HDPE Ships for Free (standard ground, see map)
  • Expedited shipping only available on orders over $2,000 
         Call: (800) 520-7731 for pricing and ship times

Shipping estimates shown on the map pertain to this specific product only. HDPE orders typically ship same day if the order is placed before 12:00 noon CST. Transit times displayed in the map are listed in business days, and are approximate. Transit times are subject to stock levels at regional warehouses.  The day that the order is shipped is not counted as a transit day.

Thickness comparison

The below is a thickness comparison of the material. HDPE plastic thickness is measured in "mils" which is "thousands of an inch".

Planter Liner Material in nursery

Raised Planter Liner

When Or Where You Should Use Planter Liners

Using a liner in wooden or metal planters can prevent these boxes from deteriorating over time. Plastic, varnish, and burlap fabric liners are the best choices for liners and can prevent the planters from rotting out or rusting.

We have received many questions on the subject of liners including what's the best material for a liner?, can I use trash bags instead of liners? Stick with us, we will address all your questions as we go along.

Do I Have To Use A Liner In My Planter?

In all honesty, liners are very important for boxes made of wood. Wood is a degradable material and metal is inclined to rust.

Planter Liners Made Of Wood

Liners for wood have been a popular choice for planters for some time now. The downside, wood can degrade quite quickly when in contact with water so the liners must be used to maintain the planter's sustainability. Think about it, a piece of wood in constant contact with water, will eventually turn brown or black and then start to rot.

More than likely, this will happen in your garden since you are applying water to your plants on a regular basis. On top of that, you will have an abundance of microorganisms in the soil. If you place soil directly into a wood plant box, the microorganisms will degrade the wood because wood is a biodegradable material.

If You Have A Metal Box, Use A Liner

Metal is known to rust if in contact with water. Rusting can cause soil toxicity due to the release of various chemicals including iron, In turn, metal will cause your plants to become stunted and their leaves will turn yellow.

With continuous contact with water, the metal interior of the box will start to rust.  Rusting will not have a direct effect on the plants but can lead to heavy metal toxicity in the soil.

When too much rust forms it will mix in with the soil and accumulate if minerals like iron are plentiful in the soil. Rust will make it very difficult for your plant's roots to absorb essential nutrients including nitrogen, phosphorus, and potassium.

Not being able to absorb needed nutrients, plants will not have the resources to increase their growth. The outcome, their growth will be stunted and their leaves will turn yellow.

Planter beds on roof

Plastic Liners Used on Garden Roof

The Advantages Of Using A Planter Liner

Using a liner has its benefits including:

Prevents biodegradable planters from decomposing -

A liner will protect your plant boxes that are biodegradable such as wood.  Liners add a layer of protection when they separate the soil, loaded with microorganisms, from the wooden surfaces.

Prevents rusting in metal planters -

Liners can stop contact with water and metal-based parts of a planter. It will prevent this specific planter from rusting and depositing the rust into the soil.

Inhibits fluctuating soil temperatures -

Liners can serve as an insulator for planter boxes. Using a thick layer of plastic sheet will absorb and trap excessive heat from the environment. In turn, this will lessen the heat being absorbed into the soil.

Prevents the growth of weeds -

For planters that are not raised, a liner will help planters stop the weed seeds deposited below the soil's surface from growing through the plant boxes.

Will restrict soil pests -

Using a liner, you can control the conditions and protect the soil in your planter box. There will be fewer chances of pests including ants, gophers, and moles from entering.

The Disadvantages Of Using A Planter Liner

Some of the disadvantages include:

Plater Bed with plants growing

Plastic Liner Used in Raised Bed

Blocks Proper Drainage -

Using liners will affect drainage because you are blocking soil but this can be remedied using some simple solutions.

Gardeners can poke holes in the planter's liner to provide good drainage. This will help to avoid the accumulation of water below the soil that carries diseases from fungi and bacteria.

Note: In some cases you will want our outside waterproof plastic to be kept intact to prevent any water penetration to the side of your planter.

Blocks Proper Drainage -

Using liners will affect drainage because you are blocking soil but this can be remedied using some simple solutions.

Gardeners can poke holes in the planter's liner to provide good drainage. This will help to avoid the accumulation of water below the soil that carries diseases from fungi and bacteria.

Likely To Suffer From Mechanical Damage -

Liners can become damaged from various activities such as using a trowel for digging which can lead to large tears in the liner, especially if it's made from a lesser material like plastic. In turn, this will defeat the entire purpose of protecting wood or metal planers. This is mostly avoided by using a liner with a mil thickness of 30 mil and up.

Difficulties Changing The Soil -

In the long run, it will take a lot more work to remove all the soil from the plant box and put it back after changing out the liner.

The Three Best Materials For A Good Liner -

The best materials for a good liner are thick, plastic membranes. These membranes are typically constructed of HDPE and available in roll form.

Plastic -

The best material for liners in wood planters is plastic (HDPE).  Plastic is thick and non-biodegradable. It protects these planters from deterioration caused by soil microorganisms and water. Plastic is very effective in linings for metal and wooden planters.

In Conclusion

Liners for your plant boxes will help keep your plants safe and healthy. You will prevent diseases and other elements from getting into the boxes causing harm to your flowers or vegetables.