THE COMPLETE PRODUCT GUIDE
Weldable HDPE Waterproofing Membrane
Pre-applied waterproofing for below-ground concrete structures. Review the product build-up, thickness options and performance data, then consult the installation guidance for your jointing method.
Product overview
A pre-applied composite membrane combining an HDPE waterproofing sheet, a hot-melt adhesive bonding layer and a water-soluble surface separation layer. Adjacent sheets connect through heat-welded overlaps, while the membrane surface bonds to freshly placed concrete.
This separates two functions: welded overlaps provide continuity between sheets, and the concrete bond helps restrict water migration between the membrane and the structure.
Key benefits
- Heat-welded joints: compatible welding equipment connects the exposed HDPE overlap faces.
- Bonded to concrete: the pre-applied system is designed to remain attached to the structure rather than rely on attachment to the supporting base.
- Robust HDPE layer: the source lists tensile strength, puncture resistance and 500% elongation across four thickness options.
- Coordinated detailing: compatible tapes, corner pieces or site-welded details connect the field membrane with transitions and local features.
Performance at a glance
- Composite thickness
- 1.2 / 1.5 / 1.8 / 2.0 mm
- HDPE sheet thickness
- 0.85 / 0.95 / 1.05 / 1.2 mm
- Tensile strength
- 21 / 25 / 25 / 28 MPa
- Elongation at break
- 500%
- Peel adhesion to concrete
- 1800 ± 300 N/m
- Roll formats listed
- 1.2 × 20 m / 2 × 20 m
Thickness-dependent values follow the same left-to-right order. Confirm roll-format availability for the selected thickness. The full table also identifies the welded-joint strength values requiring verification.
Typical applications
Pre-applied waterproofing for underground slabs and side walls, subways and tunnels. Water-retaining, waste-treatment and industrial uses require confirmation of the complete system against the intended exposure.
Weldable HDPE membrane
MATERIAL & BONDING
How the membrane is built
The supplied description identifies a modified high-density polyethylene sheet as the main waterproofing layer, combined with an adhesive layer and a water-soluble surface separation layer. The membrane is placed before the concrete pour, with the bonding face towards the fresh concrete.
The sheet describes the surface separation layer as dissolving on contact with wet concrete, allowing the adhesive layer to bond to the structure. This is distinct from the method used to connect adjacent membrane sheets.
Bond to the structure
The pre-applied system is designed to stay bonded to the concrete, helping limit lateral water migration and reduce dependence on the supporting substrate.
Mechanical performance
The supplied description highlights puncture resistance, elongation, tear resistance, hydrolysis resistance and low-temperature flexibility. Quantified properties are listed in the table below.
Reinforcement placement
The source describes reinforcement placement without a separate protective screed. Confirm the approved build-up and protect the membrane from damage during follow-on work.
Installation planning
Lightweight sheet handling and fewer construction layers may simplify work. Actual crew size, construction time and weather suitability depend on the project and site conditions.
The source refers to solvent- and fuel-free membrane installation. Heat-welded overlaps still require suitable powered welding equipment. Claims about time savings, waterproofing grades or all-weather use must be confirmed for the project rather than treated as universal guarantees.
TECHNICAL PERFORMANCE
Product specifications
On a small screen, swipe the table horizontally to compare all configurations.
| Property | 1.2 mm | 1.5 mm | 1.8 mm | 2.0 mm | Test method¹ |
|---|---|---|---|---|---|
| Colour | White | White | White | White | — |
| Composite membrane thickness | 1.2 mm | 1.5 mm | 1.8 mm | 2.0 mm | ASTM D3767-2003 |
| HDPE sheet thickness | 0.85 mm | 0.95 mm | 1.05 mm | 1.2 mm | ASTM D3767-2003 |
| Adhesive layer thickness | 0.2–0.3 mm | 0.2–0.3 mm | 0.2–0.3 mm | 0.2–0.3 mm | — |
| Tensile strength (HDPE sheet) | 21 MPa | 25 MPa | 25 MPa | 28 MPa | ASTM D412-2016 |
| Elongation at break (HDPE sheet) | 500% | 500% | 500% | 500% | ASTM D412-2016 |
| Puncture resistance | 800 N | 1000 N | 1200 N | 1350 N | ASTM E154-2008 |
| Peel adhesion to concrete | 1800 ± 300 N/m | 1800 ± 300 N/m | 1800 ± 300 N/m | 1800 ± 300 N/m | ASTM D903 |
| Peel adhesion — welded joints² | 11000 N | 15000 N | 15000 N | 15000 N | ASTM D6392:2012 |
| Low-temperature flexibility | ≤ −25°C | ≤ −25°C | ≤ −25°C | ≤ −25°C | ASTM D1970 |
| Dimensional stability | ≤ 1% | ≤ 1% | ≤ 1% | ≤ 1% | ASTM D1204 |
| Roll size (width × length)³ | 1.2 × 20 m or 2 × 20 m | 1.2 × 20 m or 2 × 20 m | 1.2 × 20 m or 2 × 20 m | 1.2 × 20 m or 2 × 20 m | — |
¹ Values and test references are transcribed from the supplied product sheet. Referenced editions are reproduced as supplied, not presented as current certification. Confirm test reports and project acceptance criteria before specification. Low-temperature flexibility is a material property, not an installation temperature.
² The original table lists welded-joint peel adhesion as 11000 N and 15000 N. These values are reproduced for completeness; the units, specimen width and reporting basis need confirmation before design or acceptance use.
³ The source lists 1.2 m × 20 m and 2 m × 20 m roll formats but does not allocate them by thickness. Confirm availability for the required configuration. Composite, bare-film and adhesive-layer thickness values are retained separately as supplied; confirm how total thickness is measured.
View the original welded product pages +
The complete supplied pages are reproduced below for reference. Where the original wording is unclear or conflicting, use the review notes in this guide and request confirmation before use.
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