The Best Way To Joint Membranes Together

The Best Way To Joint Membranes Together

How do you keep the membrane in place?

Geotextile membranes are used as separation, filtration, or protective layer. Meaning there will be more layers to go above such as gravel, soil or EcoGrid. Preparing the membranes properly can ensure a smooth installation.

The benefit of securing the membranes together is that you don’t have to worry about them moving around. For smaller projects, it is plausible to install without joining. If the project involves multiple sheets of membrane, we would recommend using our accessories to attach those membranes together.


How To Joint

Geotextile membranes have 4 methods when it comes to joining, and they work in different ways.

1.  Overlapping

This is the most widely used method since it doesn’t require any extra products. With this method, please make sure you leave plenty of fabrics to be overlapped (between 200-300mm) and the overlapping area should be flat to ensure no substances can go past. The obstacle to this approach will probably be stopping the membranes from moving around by other factors such as wind or people walking across them.


2.  Pinning

The ground pegs and pins with a long body and barb design allow it to pin the membrane firmly on the ground and are difficult to extract.

Black Barbed Pegs are tough and easy to install. A 160mm body with an 8.4mm square head, can be used with woven membranes, non-woven membranes, erosion control blankets and other ground fabrics.

Available in packs of 100, 200, 500, 1000 and 2000.

2-in-1 Barbed Fixing Peg and Bay Markers also come in a 160mm body, along with a white cycle attached to mark out parking spaces. Other than membranes, these pegs can also secure grid paving on the ground.

Available in a pack of 10.

U Shaped Galvanised Metal Pins can be installed with no equipment needed; the sharp ends make them easy to penetrate through fabrics. The pins come in a length of 15 x 2.5cm and 3mm thick.


3.  Sticking

The Jointing Tape will stick to the two overlapped membranes to improve installation stability. We strongly recommend our tapes over others in DIY stores because our tapes have been proven to be of premium quality.

Single-Sided Cloth Jointing Tape is ideal for permeable woven and non-woven membranes. Since the single-sided tape is cloth tape, it will also be permeable to a certain extent.

Available in 100m x 50m.

Double-Sided Butyl Jointing Tape is suited for the Ecoflex underground drainage geomembrane impermeable geotextile. This butyl tape was developed to be very sticky, even at lower temperatures. It does a good job of being damp-proof and creates watertight joints.

Available in 50mm x 20m and 100mm x 15m.


Other than tape, you can also apply hot-melt adhesives (hot glue) according to manufacturing instructions. You will need to put pressure on and force the glue into the fabric for it to work.


4.  Sewing

There are 2 ways to perform sewn joints, you can either have an edge face-to-face prayer seam or a lapped J seam, and they can be stitched with either a single or double stitch line based on the strength needed. It is common to use a polyester or aramid sewing thread to joint the membranes.

Slope installation and sand surface areas will benefit from the sewn joint, it provides extra support for ground stabilisation and prevents sand from transferring through the joint.


Measure For Quantity

You now know about the benefits of jointing membranes and are ready to order some, but how much should you order?

Pay attention to the amount of overlap you need, the minimum amount of overlap we recommend between joints is 200-300mm.

For Pegs

Generally, we suggest using 1 peg per 1m around the joint and some extra for precaution.

For Tapes

For example, using 4 full rolls (4.5m x 100m) of geotextile membranes will need 6 rolls of tapes (100mm x 50m).


We hope this information will help with your project preparation. If you still have any doubt, contact us at and we will do the calculation for you.