Repair Systems — Specialist Membranes
Root resistant membrane systems — planter boxes and podiums
Technical product reference for root resistant waterproofing membranes used in planter box and green roof remediation. Covers FLL certification, root resistance mechanisms, sheet versus liquid-applied selection, high-risk plant species, protection board and system build-up, and Australian brand comparisons.
What are root-resistant membrane systems?
Root-resistant membranes waterproof planter boxes, green roofs and podium gardens where plant roots would attack and penetrate a standard membrane. Root resistance comes from the membrane's inherent chemistry (PVC), a dosed anti-root additive, or a chemical root inhibitor (e.g. Preventol B2) carried throughout the membrane and its overlaps. They come as heat-welded/loose-laid sheets, liquid membranes, torch-on caps and hot-melt systems. Selection turns on the basis of root resistance (and that it is continuous through laps/details), the form for the build-up, and the Class 2 (NCC) test evidence to AS 4654.1.
Class 2 (NCC) — planters, green roofs & podiums: specify only a membrane with current Australian test certification (see the “Class 2 / NCC tested” field on each card). Root resistance must also be continuous through laps, upstands and penetrations.
Product Reference
Individual products — one card each — scroll to view all
ARDEX Australia
ARDEX Root Repell (WPM 1000 RR)
Heat-welded PP-lined sheet membrane with root inhibitor
ARDEX Root Repell (WPM 1000 RR / WeldTec Garden membrane) is a polypropylene-lined, heat-welded sheet waterproofing membrane incorporating the Preventol B2 root inhibitor to repel root growth, for planter boxes, retaining walls and green roofs. The WPM 1000 base is BRANZ-tested to AS 4858/AS 4654; confirm the test report covers the RR variant.
Wolfin / Projex Group
Wolfin IB (root-resistant PVC)
Loose-laid polyester-PVC sheet — inherently root-resistant
Wolfin IB is a German-engineered polyester-PVC single-ply sheet whose PVC chemistry is inherently root-resistant, used loose-laid/mechanically fixed for planter boxes, green roofs and podiums. NATA-tested to AS 4654.1 and AS 4858; Projex sole AU distributor; accredited applicators; up to 20-year single-point warranty.
Cosmofin / Projex Group
Cosmofin FG / FG LL (root-resistant PVC)
Reinforced PVC single-ply — inherently root-resistant
Cosmofin FG / FG LL is a 1.5 mm reinforced flexible PVC single-ply membrane (engineered by Wolfin) whose PVC chemistry is inherently root-resistant, for planter boxes, green roofs and podiums. NATA-tested to AS 4654.1 and AS 4858; Projex sole AU distributor; accredited applicators; up to 20-year single-point warranty.
Tremco CPG Australia
Tremco TREMproof 211 + Anti-Root Additive
1-part liquid membrane with anti-root additive
Tremco TREMproof 211 is a single-component, low-VOC liquid waterproofing membrane used with the Tremco Anti-Root Additive for planter boxes. The page states it is tested to AS 4654.1; a named test certificate was not cited. Confirm the additive dosage and current certification against the Tremco Australia TDS.
Tremco CPG Australia
Tremco TREMproof Torch Anti-Root
Torch-on APP SBS cap sheet with through-membrane anti-root
Tremco TREMproof Torch Anti-Root is a 3.8 mm APP modified-bitumen torch-applied cap sheet, polyester-spunbond and glass-filament reinforced, with extremely effective anti-root properties throughout the membrane including overlaps, applied as the top layer of a planter/green-roof system. The page states tested to AS 4654.1; a named certificate was not cited.
Soprema
Soprema Colphene 3000 + Alsan Flashing Quadro
Hot-melt rubberised-asphalt system with root-resistant flashing
Soprema Colphene 3000 is a hot-melt rubberised-asphalt field membrane combined with root-resistant Alsan Flashing Quadro for the details — a monolithic, fully-bonded, protected system for inverted/green roofs, planters and plaza decks. Confirm the current Australian system and availability with Soprema (via Bayset).
Fosroc / Parchem
Fosroc Nitoproof 210
1-part water-based bituminous-rubberised membrane with root inhibitor
Fosroc Nitoproof 210 is a high-performance, single-component, water-based bituminous rubberised waterproofing membrane containing a root-penetration inhibitor, for retaining walls, planter boxes, building foundation walls and below-ground tanking. Confirm coverage, DFT, primer and certification against the current Fosroc / Parchem TDS.
System Comparison
Root-resistant membrane systems — confirm all selections against the current manufacturer TDS before specifying.
Scroll the table sideways to see every column →
STANDARD WATERPROOFING MEMBRANES ARE NOT SUITABLE FOR PLANTER BOX AND GREEN ROOF APPLICATIONS — A ROOT RESISTANT MEMBRANE MUST BE SPECIFIED
A standard liquid-applied polyurethane membrane, torch-on modified bitumen sheet, cold-applied bituminous sheet, or PVC single-ply membrane without specific root resistance certification is not suitable for use as the waterproofing layer beneath a planter box or green roof installation. Roots from plants, particularly woody species and aggressive grasses, will penetrate a standard membrane over time — often within five to ten years of planting — leading to water ingress through the structural slab below. Where soil, growing medium, or planting above any surface is present, always specify a membrane that carries FLL root resistance certification or incorporates a confirmed root inhibitor compound. Do not substitute a standard membrane on the basis that the plant species appear low-risk — plant species change and root growth is difficult to predict.
BAMBOO, RUNNING GRASSES, AND WOODY TREES REQUIRE FLL-CERTIFIED SHEET MEMBRANES — LIQUID-APPLIED SYSTEMS MAY BE INSUFFICIENT FOR HIGH-RISK SPECIES
Not all root resistant membranes provide equivalent protection across all plant species. Bamboo (particularly running bamboo varieties) and vigorous woody shrubs and trees with aggressive root systems produce rhizomes and roots with sufficient mechanical force and diameter to penetrate liquid-applied or torch-on modified bitumen membranes even where an anti-root additive has been incorporated, particularly if the membrane has areas of reduced thickness or inadequate cure. Where the planting schedule includes bamboo, running grasses, Ficus species, large palms, or trees with documented aggressive root systems, the waterproofing consultant must specify a weldable polypropylene or FLL-certified PVC sheet membrane as the minimum standard. Liquid-applied PU systems with anti-root additive and torch-on anti-root cap sheets may be appropriate for lower-risk planting palettes only. Always obtain the plant species schedule from the landscape architect before finalising membrane selection.
CONFIRM FLL ROOT RESISTANCE CERTIFICATION AND CURRENT CERTIFICATE STATUS WITH EACH MANUFACTURER BEFORE SPECIFYING
FLL root resistance certificates are issued for specific tested products and may expire or be withdrawn if a product formulation changes. Do not rely on a past TDS, a historical project reference, or a distributor claim that a product is "FLL certified" without confirming the current certificate status directly with the manufacturer. Request the current FLL test certificate number and confirm it is valid for the specific product and product variant (including thickness) to be specified. Additionally, note that FLL certification is granted to a specific product tested at a specific thickness — specifying the same product at a reduced thickness may not be covered by the certificate. Confirm application thickness requirements with the manufacturer alongside the certificate.
THE ROOT RESISTANT MEMBRANE IS ONE LAYER IN A COMPLETE PLANTER BOX OR PODIUM SLAB SYSTEM — SPECIFY THE COMPLETE SYSTEM BUILD-UP
The root resistant waterproofing membrane alone does not constitute a complete planter box or green roof system. The complete system from slab upward includes: the root resistant waterproofing membrane, a protection board or drainage mat immediately above the membrane, a drainage cell or aggregate drainage layer, a geotextile filter fabric, and then growing medium and planting. Each layer must be specified and coordinated with the landscape architect and waterproofing consultant. Inadequate drainage above the root resistant membrane — including undersized drainage outlets, blocked filter fabric, or an absence of drainage cells — will cause waterlogging in the growing medium, plant death, and increased hydrostatic pressure against the membrane. The root resistant membrane does not eliminate the need for correctly sized and positioned drainage outlets to the structural slab drainage system.
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer technical data sheet, project specification, substrate condition, plant species list from the landscape architect, FLL root resistance certification, drainage design, NCC requirements, and waterproofing consultant advice. Root resistant membrane installation requires manufacturer-accredited applicators for weldable sheet systems — confirm accredited applicator availability before specifying. The root resistant membrane must be specified as part of a complete planter box or podium slab system including protection board, drainage layer, filter fabric, and drainage outlets. Do not rely on this reference as a substitute for professional waterproofing consultant or landscape architect advice.