Underlayment Fabric

For Larger Projects or Contractors. Shipped Truck Freight

• This soft, polyethylene fabric will last 20+ years under your liner. It is a 3-dimensional underlayment that allows gases to escape.
• It has a non-slippery surface and provides protection for the liner from rocks and other sharp objects, spreads easily, and saves time compared to using newspaper or sand.
• It also will not decay like newspaper or carpet padding
• This is a non-woven, 4-oz. needle-punched Geotextile.
• Available in 7.5' & 14' 11" wide rolls
• We also custom cut sizes - please call for pricing.

TJB-INC INSTALLATION TIPS:

• We use this underlayment in all of our water feature installations. 
• Anywhere we install EPDN liner, we first put down 1 or more layers of the unerlayment.  The amount of layers is detirmined by how clean the soil is under the liner.  If there is not a lot of rocks or roots, one layer will do.  If you are installing pond liner over rock, then we recommend putting a layer of sand or stonedust down first on all of the horizontal surfaces.  The follow-up with a layer of underlayment.  If your sidewalls are bad, then sand won't work for vertical surfaces.  This is where we would double or triple the underlayment so we are protected against punctures in the liner from buried debris.
• If you are placing large rocks in the pond, cut a piece of unerlayment to go between the rock and the pond liner.  If the rock is very rough, use several layers of fabric.
• Most puntures are caused when you go to re-position a rock.  As you swivel the rock, it grabs the liner and creates a tear.  This can still happen if you use a scrap piece of pond liner.  Rubber against rubber grabs an can still tear the pond liner.  This is why TJB-INC recommends using a piece of underlayment under the larger rocks.  Do not worry how it looks.  When you add the smaller filler rocks and the gravel, the underlayment you used will be covered up.
• Underlayment is cheap compared to having to go back and find a leak!