HERMEQ UK
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HERMEQ DACHGeomembranes
A geomembrane is a low-permeability liner that contains liquids and controls fluid migration on civil engineering, construction and landscape projects. Geomembranes are used for solid and liquid waste containment, ponds, lakes and lagoons, canals and dams, attenuation tank wrapping and barrier layers on contaminated land.
HERMEQ supplies polypropylene and LLDPE liners in rolls, the Proflex propylene/ethylene membrane with improved elasticity, EPDM rubber lining in panels that reduce on-site jointing, and a high visibility marker membrane for contaminated ground. Each is flexible enough to follow irregular formations, and the range covers both temporary installations and long-term infrastructure works.
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Geomembrane types: PP, LLDPE, Proflex and EPDM
Each material suits different work: polypropylene and LLDPE rolls cover lining and wrapping work across civil engineering, Proflex suits large and uneven formations, EPDM rubber suits ponds and lagoons, and the high visibility membrane marks buried contamination for anyone who digs there later.
Polypropylene (PP) geomembrane
Polypropylene liner is the most widely applicable sheet in the range, with catalogue applications spanning waste containment, water bodies, watercourses and contaminated land. Choose the polypropylene geomembrane when one material has to serve several jobs on the same scheme, such as wrapping an attenuation tank and lining a balancing pond, so the gang works with one sheet and one jointing method throughout. It is supplied in more than one roll length, which helps match the order to the area with fewer offcuts.
LLDPE geomembrane liner
Linear low-density polyethylene, sold here as Techline, is the polyethylene liner in the range, and buyers who ask for an LDPE or polyethylene liner are usually after this material. The catalogue describes the LLDPE geomembrane liner for stabilising earth and securely containing solid and liquid waste, which makes it the choice for containment cells and lined earthworks.
Proflex elastic geomembrane
Proflex is made in wide rolls and in a choice of thicknesses. Choose the Proflex elastic geomembrane for large plan areas and irregular formations, where a sheet that stretches to follow the ground and covers more area per roll cuts down the number of joints.
EPDM rubber lining
EPDM is a synthetic rubber, and Sealeco Greenseal EPDM rubber pond lining is the rubber liner HERMEQ supplies for water features and amenity water. It is the material to choose for ponds with an irregular outline, shelves and planting margins, where a flexible rubber sheet folds neatly into the shape.
High visibility marker geomembrane
The high visibility contaminated ground warning membrane is a marker layer for reclaimed industrial land, laid as good environmental practice so that future contractors and excavators know hazards remain buried below. It goes over the contaminated material and beneath the clean cover or capping, so anyone digging later reaches the bright membrane before reaching the hazard. Where the same ground also needs a barrier to stop contamination migrating, a polypropylene or LLDPE liner does that work and the marker sits above it.
Thermoplastic rolls or EPDM rubber panels
The range divides on how the lining is assembled on site. PP, LLDPE and Proflex come as thermoplastic sheet in rolls, and each run is overlapped and jointed to the next on site, so they suit groundworks gangs and lining contractors who are set up to joint a liner and test the seams. They work well on containment cells, trenches, tank wrapping and long linear lining, where runs can be laid in a regular pattern. EPDM is supplied as panels made to reduce on-site jointing, so it suits ponds and lagoons where the outline is irregular and fewer seams matter.
The number of joints decides the choice more often than the material does. Every seam takes site time to make and has to be inspected and tested before any cover goes on, so a job with a complicated shape, a small team or no jointing equipment on site favours fewer, larger pieces. Where the area is large and regular and the crew is equipped for jointing, rolls are quicker to place and simpler to cut to cells and trenches, and the wide Proflex rolls reduce the seam count further on open ground.
Geomembrane liner uses
Waste containment and contaminated land
Solid and liquid waste containment needs a continuous barrier across the base and sides of the cell, with every joint sound and the sheet protected from the material placed on it. The catalogue ties both the polypropylene and LLDPE liners to this work. On contaminated land, polypropylene is listed as a barrier layer, separating contaminated ground from clean cover, services and new construction.
Ponds, lakes and lagoons
The catalogue gives EPDM rubber lining for golf ponds, attenuation ponds, swimming ponds and lagoons, and polypropylene for amenity lakes and ponds. The edge needs the most attention on these jobs: the lining is exposed where the water level rises and falls, so it is buried in the bank at the top and the margin is protected against wave action, footfall and animals. Products for that edge are in the water margin protection range. Large lagoons with simple outlines can also be lined in wide Proflex rolls.
Canals, watercourses, dams and balancing ponds
Polypropylene is the liner the catalogue lists for canal and watercourse lining, dams and balancing ponds. These are hydraulic structures, so the lining has to follow the bed and banks without bridging hollows, be anchored securely at the crest and be detailed with care where it meets inlets, outlets and headwalls. Balancing ponds also see the water level change quickly, which puts the same demands on their margins as on amenity ponds.
Attenuation tank wrapping
Attenuation tanks built from modular units are wrapped in a geomembrane where the tank has to hold stored water or keep groundwater out, and the catalogue lists polypropylene for this job. The wrap is folded around the corners of the unit block inside an open excavation, so narrow rolls handle better here than wide sheet. Pipe connections are sealed into the wrap with preformed boots or collars, since the tank is only as watertight as its penetrations.
Specifying an impermeable geomembrane
Liner thickness
Thickness across the range runs from 0.75mm to 2.0mm. A thicker sheet is the choice where the subgrade is coarse, the cover is heavy or stony, plant works close to the lining during placement, or the works are permanent and hard to reach for repair. A thinner sheet is lighter to handle and folds more easily, which suits tank wrapping, small ponds and work in confined excavations. Proflex is the product to look at when a job calls for a heavier gauge, since it is made in more than one thickness, and on any job the thickness named in the designer's specification takes precedence.
Roll width and panel size
The PP and LLDPE liners come in 2m wide rolls and Proflex in 7m wide rolls, with EPDM supplied in panels. Narrow rolls are easier to carry into trenches and lay by hand in tight spaces. On slopes, the usual practice is to run seams down the slope from crest to toe, so that joints are not loaded across their length and water does not run along them.
Subgrade and protection layers
The ground under a geomembrane is trimmed, compacted and cleared of stones, roots and sharp debris before the liner goes down, because any point left in the formation presses into the sheet once water or cover loads it. Where the subgrade cannot be made smooth, as in stony ground, made ground or rock, a protection geotextile laid under the liner forms a cushion between it and the formation. Soft or wet formations are dewatered and firmed before lining so that the sheet does not settle unevenly.
Drainage membrane or impermeable liner
A drainage membrane carries water away and an impermeable liner holds it, so the two are different products despite their similar names. Searches for a drainage geomembrane, including branded urban drainage membranes, are usually looking for a geocomposite: a core that carries water to an outlet, faced with a filter fabric, and used behind retaining walls and against basement walls. HERMEQ sells these as geocomposite drainage membranes, alongside the rest of its geotechnical products. On some schemes the two are used together, with a drainage layer relieving water pressure against the liner.