Pond Liner & Underlay Pond Liner & Underlay We carry a full line of flexible 45 mil EPDM pond liner and installation products to create the perfect pond or water feature. From large commercial ponds to small water gardens you'll find the perfect installation and repair products here.
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Pond Liner & Underlay

Pond Liner & Underlay

We carry a full line of flexible 45 mil EPDM pond liner and installation products to create the perfect pond or water feature. From large commercial ponds to small water gardens you'll find the perfect installation and repair products here.

SIZING A POND LINER

First, you will need three pond dimensions- length, width and max depth. These measurements should be all be made in feet. You’ll then add the length to two times the depth plus 2. You use two times the depth because the liner needs to go down on both sides. The extra two feet is for overhang. This gives you one extra foot on each side.

    The formula will look like this:
  • Pond Length + (2 x Max Depth) +2 = Length of Liner
  • Pond Width + (2 x Max Depth) + 2 = Width of Liner
    For example:
  • Longest Length = 10’
  • Widest Width = 6’
  • Deepest Depth = 3’
  • 10’ + (2 x 3’) + 2 = 18’
  • 6’ + (2 x 3’) + 2 = 14’

So, the liner needed for this pond is 18’ X 14’. More often you’ll need to round up or down since liners are cut in 5 ft. increments. The closest liner size, commonly available for the above dimensions, would be a 20’ x 25’ liner.

Carlisle EPDM Liner

Carlisle's fish-friendly AquaTough EPDM pond liners combine design flexibility, long-term durability and easy installation, making them an ideal choice for a variety of waterscape applications.

Carlisle and Firestone

Firestone & Carlisle's fish-friendly EPDM pond liners combine design flexibility, long-term durability and easy installation, making them an ideal choice for a variety of waterscape applications. Specially formulated to be fish and plant safe.

Firestone EPDM Liner

Firestone PondGard EPDM liner is the material of choice for various waterproof lining applications. Specially formulated to be fish and plant safe, they can easily be shaped to fit the unique contours of any size pond or complex landscape feature.

Pond Underlayment

Protect your liner from rocks, roots and other sharp objects with a fabric underlayment. Can also be used on top of liner to protect from punctures when adding gravel and stone inside the pond.

Seaming & Repair Materials

Whether seaming or repairing liner you'll find all the necessary components here. Choose from seaming and repair tapes, patch kits, pipe-boots, etc.

ALL LIQUID RUBBER PRODUCTS

Multi-purpose coating that cures into a waterproof membrane. Available in a variety of colors. Seaming tapes are also available for seal joints and tears.

All Liners (EPDM) & Underlays

We carry the full line of flexible Firestone 45 mil Pond Liner and installation products to create the perfect koi pond or water feature. If you are looking for a rugged liner at a great price our site is the place to be. From large commercial ponds to small water gardens we have the right product for you. Protect your pond with a long lasting, fish safe and fish friendly Firestone Liner.

Our Most Popular Pond Liner & Underlay

Liquid Rubber Waterproof Sealant Original Black
    Flexible Heavy-Duty Coating
  • Multi-Purpose coating that cures into a waterproof membrane
  • Used for roofs, RV's, gutters, planters, foundations, ponds....
  • Excellent adhesion, chemical and UV resistance
  • Flexible and resistant to freeze/thaw cycles
  • Water based " No harmful solvents or VOC's
  • Colored version sticks great to EPDM
    Steps
  • Ensure a clean, dry surface
  • Bridge any joints, seams, venting, cracks... with Seam Tape
  • Build up your coats to achieve required thickness.
    Tips
  • Avoid hot, direct sun when applying.
  • Product stays soft, flexible and may have some tackiness, not meant as a walking surface.
  • You can re-coat when it's dry to touch and make sure there is no uncured material underneath.
  • Apply material until you use up the required amount.
  • For larger areas, pour out and spread around with a roller or squeegee.
  • If corrosion is present, use MetalSafe Sealant.

Liquid Rubber Waterproof Sealant Original Black

Item Typical Coverage
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-
Up To 20 sq./ft.
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Pond Underlay
The Best Protection For Your Pond Liner

Don't Forget Liner Underlay. Underlay is a flexible, soft fabric placed under the pond liner for protection against punctures and friction from rocks.

  • 4.5 oz

*The roll of underlay listed below as will ship via UPS Freight.

Pond Underlay

Item Underlay Size Square Feet
6' x 100'
600
10' x 15'
150
15' x 15'
225
20' x 15'
300
25' x 15'
375
30' x 15'
450
40' x 15'
600
12' x 12'
144
12' x 100'
1200
50' x 15'
750
15' x 360' Roll*
5400
Firestone Repair Kit

Quick, easy to use kit for repairing minor damage to your rubber (EPDM) pond liner.

Firestone Repair Kit

Item
Firestone Quickseam Tape Seaming Kit

A clean, easy, safe way to create larger panels to cover a greater surface area. Environmentally friendly, and creates strong seams.

    Kit Contents
  • 1 Roll - Quickseam Splice Tape - 3" x 25'
  • 1 pt Can - Single-Ply LVOC Primer
  • 1 QuickScrubber Handle
  • 1 QuickScrubber Pad
  • 1 Seam Roller
  • 1 Special Crayon
  • Instructions

Firestone Quickseam Tape Seaming Kit

Item
Tite Seal Seam Primer & Cleaner

Ultra Bond SeamPrime is a primer/surface conditioner and adhesive enhancer for self-adhering cover seam tapes, and self-adhering membranes and underlayments. DO NOT USE ON PVC

  • Maximize Adhesion
  • Enhance Cold Weather Application
  • For All Self-Adhesive Construction Tapes & Membranes

Quick Roof UltraClean is a unique non-chlorinated blend of solvents that removes oxidation, grease, oil tree sap, and other contaminants from roof surfaces and other building materials. Non-chlorinated liner cleaner that removes oxidation, grease, oil, tree sap, and other contaminants from EPDM, PVC, and other surfaces.

  • Dries Fast
  • Leaves no residue
  • Non-chlorinated

Tite Seal Seam Primer & Cleaner

Item

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