HERMEQ UK
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Geotextile membrane is used in groundworks and infrastructure for four jobs: separation, filtration, drainage and soil reinforcement. It is laid beneath access roads, haul routes, foundations, embankments and driveways, where it keeps the sub-base clean of soil, spreads load over weak ground and controls how water moves through the construction.
HERMEQ supplies woven geotextiles for load spreading and separation under traffic, and non woven geotextiles, including Terram and Lotrak grades, for filtration and drainage. The range comes in full rolls for site work and short rolls for smaller jobs, with nationwide delivery.
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- Non-Woven Geotextile FabricQuick 3 Day Delivery
- Geotextile Reinforcement FabricQuick 5 Day Delivery
- Woven Separation Geotextile – BasicQuick 5 Day Delivery
- Interax - Tensar Geogrid MeshQuick 5 Day Delivery
- Non Woven Geotextile Fabric - Terram Weed ControlQuick 5 Day Delivery
- Non Woven Geotextile Drainage FabricQuick 5 Day Delivery
- Triax - Tensar Geogrid MeshQuick 5 Day Delivery
- Biaxial Geogrid ReinforcementQuick 5 Day Delivery
Woven or non woven geotextile
Woven geotextiles are the choice where the membrane has to carry load, and non woven geotextiles are the choice where water has to pass through it freely. A woven geotextile is made from polypropylene tapes interlaced on a loom, which gives high tensile strength and low stretch, so it spreads wheel loads across the subgrade and stops stone being pressed into clay or silt under traffic. It suits roads, car parks, hardstandings and haul routes, where separation and stability matter more than flow.
A non woven geotextile is a felt of polypropylene fibres that are needle punched and thermally bonded together. Water passes through its thickness while fine soil particles are held back, so it is the right fabric around filter drains and soakaways, under permeable surfaces and on clay or silty soils that would otherwise clog a drainage layer. It is also easier to cut and shape around pipes, chambers and curves.
Separation, reinforcement and drainage geotextiles
Woven separation geotextile
A woven separation layer goes between subgrade and sub-base under driveways, paths, car parks and site roads on reasonably firm ground. It keeps the stone from mixing into the soil, so less aggregate is lost and the surface holds its level. HERMEQ supplies the Lotrak woven separation geotextile in several grades for civil engineering work. The GP90 woven polypropylene geotextile is a general groundworks separator on full rolls, and the woven geotextile membrane also comes in a short roll for paths, patios and parking bays.
Heavy duty woven reinforcement geotextile
Where the subgrade is weak or the traffic is heavy and repeated, a reinforcement grade takes the tensile load that would otherwise rut the sub-base. The Lotrak geotextile reinforcement fabric is made for weak subgrades under heavy traffic, and it also holds soil in place behind rock on riverbanks and coastlines. The PP60 woven geotextile is for haul routes, hardstandings and construction platforms, where tracked and wheeled plant turns and brakes over the same ground every day.
Terram non woven geotextile
The Terram non woven geotextile range runs from light separation grades to heavy grades for demanding civil works. It is made from virgin polypropylene fibres bonded both mechanically and thermally, which gives it strength and resistance to abrasion from the stone placed over it. Choose it where separation and filtration are needed together: under permeable surfaces, around drainage and over clay where water has to leave the sub-base.
Non woven drainage and filtration fabric
The Lotrak non woven geotextile drainage fabric is the filter layer for French drains, filter drains and soakaways, and it separates subgrade from sub-base as well. Its openings hold soil back while water passes, so the drain stays open. For small repairs and garden drainage, the non woven geotextile fabric comes in a short roll that is easy to handle and cut.
Terram weed control fabric
The Terram weed control fabric is a non woven geotextile made for landscaping, laid under bark, gravel and decorative stone to suppress weeds without chemicals. Being permeable, it lets rain through to the soil and the plants below.
Geotextile membrane for driveways, haul roads and drains
Driveways, paths and patios
The membrane goes onto a formation that has been stripped of topsoil, roots and soft spots, then levelled and compacted. It sits directly beneath the sub-base, which is the layer it protects, and is carried up to the edge restraints or kerbs so that soil cannot creep in at the sides. Gravel drives and grass parking areas built on grass and gravel paviours follow the same principle, with the geotextile keeping the stone base clean below the paviour layer.
Haul roads, hardstandings and construction platforms
On these jobs the membrane is covered before anything runs on it. Aggregate is tipped onto stone already placed and pushed forward over the fabric, so tracks and tyres run on stone and never on bare geotextile. Ruts that appear in use are filled with fresh stone, because blading them out would expose and tear the membrane.
Filter drains and soakaways
In a filter drain the geotextile lines the trench before the pipe and stone go in, and the surplus at the sides is folded over the top of the stone with a generous overlap, so the whole drain is wrapped. Soakaway crates are wrapped on every face in the same way. An attenuation tank, which has to hold water, is wrapped in an impermeable liner from the geomembranes range, with a geotextile around it as a protection layer. Sheet drains and drainage boards for walls and podium decks are in geocomposite drainage.
Riverbanks and coastlines
On a bank, the geotextile is anchored in a trench at the crest and laid down the slope, with each upper strip lapped over the one below so that water running down cannot lift the edges. Rock armour or gabions are placed over it from the toe upwards, and the fabric stops waves and changing water levels drawing fine soil out through the gaps. Bank protection products are in water margin protection, and temporary measures for exposed earthworks and runoff are in erosion and sediment control.
Geotextile grades, roll sizes and soft ground
Matching the grade to traffic and ground
Most products in the range come in several grades, and the step up is made as traffic gets heavier or more frequent and the subgrade gets weaker. A light woven membrane or a Terram 1000 class fabric covers driveways, paths and patios, regular vans and lorries over clay call for a heavier separation grade, and weak, wet subgrades under plant call for a reinforcement fabric or PP60. Rutting or fines pumping up through an existing road show that the replacement needs a heavier grade.
Roll width and joints
Every joint is an overlap that uses fabric and a line where the layers can part, so on larger works the roll width is matched to the formation width. Rolls across the range run from 2.25m to 5.2m wide, and a width that covers the road or platform in one or two runs, with any overlap kept out of the wheel tracks, cuts both joints and offcuts.
Temporary works and the hi-vis layer
Terram is also supplied in hi-vis orange for site compounds, haul roads and working platforms that will be dug out at the end of the job. The orange layer shows the excavator driver where the temporary stone ends, so it is removed cleanly without digging into the permanent formation or leaving stone behind.
Geotextile with geogrid on soft ground
On very soft ground the geotextile separates and filters on the subgrade, and a geogrid laid on top of it confines the aggregate, so a thinner layer of stone carries the same traffic. HERMEQ supplies biaxial geogrid in several grades. The Tensar TriAx geogrid is stocked for soil reinforcement and stabilisation. The Tensar InterAx geogrid comes in three grades for the same work, and the full range is in geogrids and geocells.