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Enviro Liner Welding Gun Instructions
Using the Enviro Liner Welding Gun
The Enviro Liner Welding Gun is a low cost, manually operated, extrusion welder for small repairs in
thermoplastic geomembranes. The Enviro Liner Welding Gun will repair all Enviro Liner® brand ge-
omembranes. The Enviro Liner Welding Gun will also repair other polyolefin materials if compatible
welding sticks are available. Check with your Layfield distributor or representative for available welding
sticks.
You will need four things to perform a repair with this welding gun.
- The welding gun itself
- Power source (grounded)
- Welding Sticks (compatible with the geomembrane)
- Enviro Liner welding tape (for tacking welds)
- Repair material (left over materials from site or order new material)
Prepare the site for a welding repair. The area needs to have all liquids drained and the surface of the
geomembrane needs to clean and dry. Clean the surface of the geomembrane with water and rags.
Complete a site safety hazard assessment before using the Enviro Liner Welding Gun. Obtain all
work permits required (including a hot work permit if necessary). Do not use this gun in a poten-
tially explosive atmosphere as it is not intrinsically safe (the thermostat in this device may create
a spark). Follow all electrical safety requirements on site. Use grounded outlets and extension
cords only. Use of ground fault interrupter devices is recommended.
Gather your tools and equipment to make the repair. You will normally be using left over material from
the project installation. Make sure this material is clean. If it has been in contact with solvents, fuels, or
oils then order new repair material from Layfield. You will need a knife to cut material, rags to keep the
area clean, and a spare piece of liner (or a piece of plywood) to prevent your tools from damaging the
geomembrane. Use the stand provided to hold the Welding Gun when not in use.
Wear all personal protective equipment required by the job. In addition we recommend that you
wear safety glasses in case the welding gun sputters and gloves to guard against hot plastic.
We recommend that you practice welding on scrap pieces of liner
before attempting an actual repair. Tape two pieces of liner mate-
rial together and weld.
Prepare the patch and tack the patch over the defect. The Enviro
Liner weld tape is used to hold the patch in place during welding.
Cut your patch first and then apply the weld tape to the edge of
the patch. The tape should come right up to the edge of the
patch, approximately 2 mm (0.1”) from the edge. Place the weld
tape continuously around the edge of the patch. If for some rea-
son your weld is not perfect, the weld tape can form a back-up
seal.
Once you have outlined the patch with the weld tape, remove the
backing paper and apply the taped patch to the defect. Press the
patch in place. Your patches should extend about 50mm (2”) past the defect in all directions. You should
also round the corners of your patches. Round the last 25mm (1”) of your corners. Try and apply the
Outline the patch with EL weld tape. You
will have to tear the release paper to get the
tape around the corners.
