Geosynthetics specification guide for Malaysian projects.
A cross-category specification reference for QS, spec writers, and consulting engineers working on Malaysian projects. Spec frameworks for all five geosynthetic categories: geogrid, geotextile, geocell, geomembrane, geocomposite drainage. MARV vs DV statistical basis. Function attribution. Common spec errors and how to avoid them. JKR-SPJ Section 7 + AASHTO M288 + GRI-GM13/17/19 + BS EN 13249-13257 alignment. Example BoQ entries for each category. Starwall provides STRATA datasheets on request for spec writing.
The principle that prevents 90 percent of errors.
Every geosynthetic specification line in a BoQ should start with explicit function attribution. The function determines the spec properties; the spec properties determine the product. Skipping function attribution is the single most common cause of non-conforming delivery on Malaysian projects.
| Category | Common functions | Driving properties |
|---|---|---|
| Geogrid (uniaxial PET) | Tensile reinforcement (MSE, RSS, basal) | Wide-width tensile, creep-reduced design tensile, junction efficiency, pullout coefficient |
| Geogrid (biaxial PP) | Aperture confinement (road sub-base, working platform) | Aperture stability modulus, wide-width tensile, K-factor |
| Geotextile (woven HSR) | Tensile reinforcement (basal mat, MSE fill) | Wide-width tensile, creep-reduced design tensile, junction efficiency |
| Geotextile (nonwoven) | Separation / filtration / drainage / protection | AOS, permittivity, mass per unit area, CBR puncture, grab tensile |
| Geocell | 3D confinement (slope facing, channel, load support, gravity wall) | Strip tensile, seam strength, stress-crack resistance, cell depth |
| Geomembrane | Containment / barrier (landfill, ponds, secondary containment) | Polymer, thickness, stress-crack resistance, seam strength, interface friction |
| Geocomposite drainage | In-plane drainage (behind walls, basements, landfill) | In-plane transmissivity at design normal stress and gradient |
Get the acceptance basis right.
MARV (Minimum Average Roll Value): average minus two standard deviations of production lot. Approximately 97.5 percent of roll-level tests exceed the MARV. AASHTO M288 specifies properties in MARV. Use MARV in the acceptance column of every BoQ entry.
DV (Declared Value): manufacturer-declared value per product line, aligned with EN ISO 9862 statistical methodology. Used in BS EN 13249-13257.
Typical Value: average of production tests. Do not use as acceptance basis. Roughly 50 percent of rolls statistically fall below typical, so accepting against typical leaves room for non-conforming deliveries.
Per-category property checklist.
Geogrid (StrataGrid PET uniaxial or Biaxial PP)
| Property (MARV) | Test method | Reference |
|---|---|---|
| Polymer | declared | PET for tensile reinforcement, PP for confinement |
| Wide-width tensile T_ult | ASTM D6637, ISO 10319 | BS 8006, FHWA-NHI-10-024 |
| Long-term design tensile T_d | RF framework per ISO 13431 | RF_ID × RF_CR × RF_CH × RF_W |
| Junction efficiency | ASTM D6638 | typical > 90 percent for STRATA PET |
| Aperture stability modulus (biaxial) | ASTM D6244 | Confinement design |
| Pullout coefficient C_i | ASTM D6706 | Embedment design |
| UV strength retention (500 hr) | ASTM D4355 | Construction exposure window |
| Manufacturer certificate of conformance | per delivery | Batch traceability |
Geotextile (Woven HSR PET or Nonwoven PP)
| Property (MARV) | Test method | Reference |
|---|---|---|
| Polymer + construction | declared | Woven PET HSR for tensile; nonwoven PP for filter/separator |
| Mass per unit area | ASTM D5261, ISO 9864 | Sizing for nonwoven |
| Wide-width tensile (woven HSR) | ASTM D4595, ISO 10319 | Acceptance for reinforcement |
| Grab tensile (separation class) | ASTM D4632 | AASHTO M288 Class 1, 2, 3 |
| Trap tear, CBR puncture | ASTM D4533, D6241 | Survivability |
| AOS (filtration) | ASTM D4751, ISO 12956 | Retention against soil |
| Permittivity (filtration) | ASTM D4491, ISO 11058 | Cross-plane water flow |
| Gradient ratio (clog) | ASTM D5101 | Soil-geotextile compatibility |
Geocell (StrataWeb HDPE)
| Property (MARV) | Test method | Reference |
|---|---|---|
| Polymer (HDPE) | declared per ASTM D1248 | Carbon black 2-3 percent |
| Strip thickness | ASTM D5994 | Typical 1.10-1.50 mm |
| Strip tensile, seam peel | ASTM D7864 | Cell wall integrity |
| Cell connection separation | ASTM D6116 | Seam integrity transverse |
| Stress-crack resistance | ASTM D5397 (NCTL) | Long-term durability, target > 400 hr |
| Cell depth and size | declared | Sized per application (75-200 mm depth) |
Geomembrane (HDPE, LLDPE, PVC, EPDM)
| Property (MARV) | Test method | Reference |
|---|---|---|
| Polymer + density | declared per ASTM D1248 | GRI-GM13 HDPE, GRI-GM17 LLDPE |
| Thickness | ASTM D5994 | 1.5 mm minimum DOE hazardous |
| Tensile strength + elongation | ASTM D6693 | Polymer-specific |
| Stress-crack resistance (HDPE) | ASTM D5397 | > 500 hr for HDPE |
| Tear, puncture | ASTM D1004, D4833 | Installation survivability |
| Seam peel + shear strength | ASTM D6392, D7466 | GRI-GM19 minima |
| Carbon black + OIT | ASTM D4218, D3895 | UV durability |
| Interface friction | ASTM D5321 | Slope-side stability |
Geocomposite drainage (StrataDrain)
| Property (MARV) | Test method | Reference |
|---|---|---|
| Core polymer + thickness | declared (HDPE) | Drainage capacity foundation |
| Filter polymer + mass | declared (PP nonwoven) | Filtration of percolation |
| In-plane transmissivity | ASTM D4716 | At design normal stress and gradient |
| Reduction factors | BS EN 13252 | Creep, installation, chemical/biological clogging |
| Filter AOS + permittivity | ASTM D4751, D4491 | Filter cap on the geotextile face |
And how to prevent each.
- Mass without AOS or permittivity (for nonwoven filter applications): two different 200 gsm fabrics can have AOS values differing by 2-3 times. Prevention: always cite AOS and permittivity for filter-function fabrics.
- AASHTO M288 class without project AOS check: the class is a survivability spec, not a filter spec. A Class 2 fabric with generic AOS may fail retention against project-specific high-fines residual soil. Prevention: apply M288 class for survivability and add project-specific AOS limit.
- Ultimate tensile without reduction factor framework (for reinforcement): a product compliant with T_ult of 200 kN/m delivers long-term design tensile T_d of 80-100 kN/m after RF_ID × RF_CR × RF_CH × RF_W. Prevention: specify both T_ult MARV and T_d demand; require manufacturer datasheet to evidence T_d.
- Mixed polymers in one line item: "PET or PP" in the same line allows substitution that compromises design intent. Prevention: declare polymer explicitly; write separate line items for separate polymers.
- Typical values in the acceptance column: half of rolls statistically fail typical. Prevention: use MARV (or DV per EN ISO 9862) in acceptance.
Malaysian government works spec.
JKR Standard Specifications for Roadworks and Building Works (Section 7, Earthworks and Slope) reference geosynthetic properties in line with AASHTO M288 (geotextile) and various ASTM / ISO test methods. A JKR-aligned BoQ entry for any geosynthetic typically includes:
- Function attribution (reinforcement / separation / filtration / drainage / protection / containment / confinement)
- Polymer declared
- AASHTO M288 class (for geotextile) or applicable acceptance code (GRI-GM13/17/19 for geomembrane, NCMA SRW for modular wall systems)
- MARV property values per ASTM / ISO test methods relevant to the function
- UV strength retention after 500 hours where outdoor exposure applies
- Manufacturer certificate of conformance with batch traceability
- Installation handling and QA requirements per relevant code
Submission to JKR Cawangan requires the consulting engineer's design report demonstrating the geosynthetic meets the project's structural, hydraulic, or containment demands, supported by the manufacturer's published MARV or declared values.
Performance-based, then named equivalents.
For most Malaysian projects, performance-based specification (function + properties + standards) is preferred over brand-named specification. Performance-based specs allow competitive procurement, are defensible under public procurement rules, and protect the design intent regardless of supplier.
Where a specific product is mandated (because of compatibility with adjacent geosynthetics, prior installed base, or design liability), an "or approved equivalent" clause around a named product is conventional. The equivalent must be demonstrated by manufacturer datasheet with MARV / DV meeting or exceeding the named product, independent test reports (ISO 17025 accredited typically), track record on comparable projects, and certificate of conformance with batch traceability.
STRATA Geosystems products supplied through Starwall Sdn Bhd in Malaysia are accepted on JKR and private-developer projects. Datasheets and certificates of conformance available on request for spec writing. Visit strataglobal.com for the international manufacturer reference list.
Continue on category-specific design and spec.
Geotextile spec guide →
11 properties, MARV vs DV, AASHTO M288 classes, BoQ examples.
Geotextile design guide →
Filter criteria, separation, reinforcement, drainage.
Geogrid design guide →
Four design tracks with reduction factor framework.
Geocell design guide →
Slope, channel, load support, gravity wall.
Geomembrane design guide →
Polymer selection, seam QA, interface friction.
STRATA Malaysia distributor →
Brand authority, full product range, datasheets.
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