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Hot Wedge Welding is the primary seaming method for the Geo-membrane. The high temperature wedge is used to melt the facing overlapped surfaces and then press them together with two nip/drive rollers. This makes a permanent bond between the two Geo-membrane.

Extrusion welding method is commonly used for repairs and detail works. Extrusion welder provides a hot extrudate (molten plastic) using 4 or 5 mm diameter welding rod made of the same material as the liner. The hot extrudate is deposited on the edge of two overlapped liners, resulting in an extrusion beam. A hot air device is used to preheat the liners in the weld area to tack these two liners together.