HDPE GPS waterproofing membrane 1.5mm

Overview of the 1.5mm HDPE GPS waterproofing membrane

In key waterproofing components of houses such as basements, foundations, rooftops, and landscape features, HDPE liner material is widely used thanks to its excellent water-blocking ability and long lifespan. Understanding the nature of the HDPE GPS 1.5mm waterproofing membrane is essential for choosing the right material for residential technical requirements.

The HDPE GPS 1.5mm waterproofing membrane is a high-density polyethylene (HDPE) sheet manufactured according to geomembrane standards, designed to create a stable water-barrier layer in buried environments. Its 1.5mm thickness delivers a balanced combination of mechanical strength, flexibility, and ease of installation, performing well under harsh conditions in housing projects. With a closed and stable polymer structure, the 1.5mm HDPE membrane provides near-absolute waterproofing, while also resisting chemicals, UV radiation, and compressive load.

In residential environments, this material functions as an independent water-barrier layer that does not rely on moisture conditions or substrate surfaces. This helps reduce the risks of reverse seepage, wall-base moisture, or structural damage in areas frequently exposed to water.

Structure and technical specifications of the HDPE GPS 1.5mm membrane

The technical factors of the HDPE GPS 1.5mm waterproofing membrane determine its durability in soil, water, and sunlight. Understanding the specifications helps investors and engineers accurately assess its suitability for residential construction.

Material composition of the HDPE GPS 1.5mm membrane

The HDPE GPS 1.5mm waterproofing membrane is composed of:

• Virgin HDPE resin as the main component
• Thermal stabilizers
• Antioxidant additives
• UV-resistant additives

Virgin HDPE provides tensile strength and resistance to cracking, while UV additives allow the material to withstand long-term sunlight exposure on rooftops or landscape ponds.

Layer structure and properties of the 1.5mm thickness

At 1.5mm thickness, the membrane offers:

• Excellent puncture resistance when buried
• Suitable elasticity for corners, edges, and bends
• Moderate stiffness, easy to lay and weld
• Ability to withstand water pressure in basements, foundations, and landscape ponds

This is why the 1.5mm type has become the standard for many high-end residential projects.

Technical standards of the HDPE GPS 1.5mm membrane

Key applicable standards include:

• ASTM D638: tensile strength

• ASTM D5397: environmental stress crack resistance
• GRI GM13: the most stringent geomembrane standard
• Permeability coefficient ≈ 10⁻¹⁴ cm/s
• Outstanding UV resistance

The 1.5mm GM13-grade version is especially suitable for basements, where high stability is required.

Types of HDPE GPS 1.5mm membranes used in housing

When choosing waterproofing materials, users often assume that there is only “one type of 1.5mm HDPE membrane.” In reality, even with the same thickness, HDPE GPS 1.5mm membranes come in several forms to suit different applications. Classification by surface type and technical standards helps ensure proper usage for basements, roof decks, or landscape features.

Classification by surface type

The HDPE GPS 1.5mm membrane for residential construction comes in two main surface types:

1. Smooth-surface HDPE GPS 1.5mm membrane

• Most commonly used in housing
• Easy to install and weld on flat areas
• Applications: basements, foundations, roof decks, gardens, landscape features, fish ponds
• Advantages: reduced dirt adhesion, easy cleaning, strong and stable weld seams

2. Textured-surface HDPE GPS 1.5mm membrane

• Rough surface enhances friction
• Used in sloped areas or where additional substrate grip is needed
• Less common in houses but applicable to sloped roofs or planting areas with inclined terrain

In most residential projects, the smooth 1.5mm type is preferred due to its easier corner handling, weldability, and compatibility with flat surfaces.

Classification by quality standards

Although both are HDPE GPS 1.5mm membranes, quality varies depending on manufacturing standards. In housing projects, the following standards evaluate durability, stability, and long-term waterproofing performance:

1. GM13-grade HDPE GPS 1.5mm membrane

• Highest geomembrane standard
• Superior tensile strength, elongation, and ESCR performance
• Suitable for basements, foundations, and areas with high water pressure
• Long lifespan in buried environments

2. GM17-grade HDPE GPS 1.5mm membrane

• Suitable for fish ponds, gardens, and landscape water features
• Good flexibility and adequate strength for medium-sized residential applications
• Reasonable price and easy installation

3. HDPE GPS 1.5mm membrane meeting ASTM + GM13

• Combines ASTM international standards with GM13 requirements
• For structures requiring long-term stability in high water pressure zones or soils with corrosive properties
• Recommended for villas and premium landscape works

Advantages and disadvantages of using HDPE GPS waterproofing in houses

Understanding material characteristics helps homeowners and contractors evaluate whether the HDPE GPS 1.5mm waterproofing membrane is truly suitable for each component of the project.

Advantages

• Absolutely waterproof due to high-density polymer structure
• Lifespan of 15–25 years in buried conditions
• Resistant to mold, bacteria, and soil acids
• Strong UV stability
• Easy installation using thermal welding, ensuring watertight seams
• Not dependent on substrate conditions like coating-type materials

These are significant advantages over PVC sheets or brush-applied waterproofing materials.

Disadvantages

• Requires specialized welding equipment
• Needs smoother substrate compared to highly flexible materials like EPDM
• Requires a protective layer when placed under walkable areas
• Not suitable for walls, balconies, or bathrooms

Comparison with other materials

Applications of the HDPE GPS 1.5mm waterproofing membrane

With excellent waterproofing, high durability, and low sensitivity to soil conditions, the HDPE GPS 1.5mm waterproofing membrane is increasingly used in townhouses, villas, garden homes, and residential projects.

Basement and foundation waterproofing

The 1.5mm HDPE membrane is used as a protective liner for:

• Spread footings
• Raft foundations
• Basement walls
• Basement floor slabs

It prevents groundwater and moisture from penetrating concrete, reducing cracking and reverse seepage that may damage structure and interiors.

Garden and rooftop waterproofing

Rooftop areas used for planting or recreation are prone to water penetration. The HDPE GPS membrane provides comprehensive protection:

• Prevents root intrusion
• Blocks moisture from seeping downward
• Creates a stable base for protective layers above

Pond and landscape lining

Landscape fish ponds, mini waterfalls, and garden water features require materials that are:

• Non-toxic
• Waterproof
• UV-resistant

The 1.5mm HDPE membrane meets all these criteria.

Common misconceptions about HDPE GPS 1.5mm membranes

Several misconceptions lead to improper usage or ineffective installation. Clarifying these helps ensure the correct use of the HDPE GPS 1.5mm waterproofing membrane.

Believing HDPE can replace wall waterproofing

HDPE is only suitable for wide, flat surfaces.

Not for:

• Walls
• Bathrooms
• Balconies
• Narrow expansion joints

Choosing the wrong thickness

Many projects choose 2.0mm thinking “thicker is better,” leading to:

• Difficult installation
• Higher costs
• No additional benefit

In housing, 1.5mm is the standard.

Installing without a protective layer

Placing tiles directly on the membrane will cause punctures due to point loads.

Proper HDPE installation requires:

• Geotextile layer underneath
• Protective concrete or brick layer above

Conclusion

The HDPE GPS 1.5mm waterproofing membrane is an effective and stable solution for foundations, basements, roof decks, and landscape ponds. With high durability, excellent waterproofing, and long service life, it helps minimize water seepage risks in residential projects. Understanding its technical characteristics and ensuring correct installation maximizes its effectiveness. Homeowners and engineers should consider combining GM13-grade material with proper protective layers to enhance structural durability.

FAQ about the HDPE GPS 1.5mm waterproofing membrane

Does the 1.5mm HDPE membrane need a protective layer?

Yes. It always requires geotextile underneath and a protective layer above to prevent damage from impact or point loads.

Can HDPE be used for bathroom waterproofing?

No. HDPE is unsuitable for rough surfaces and small details such as bathrooms or balconies.

How is GPS different from PVC and EPDM?

GPS is more durable, fully waterproof, and UV-resistant. PVC is softer but has lower lifespan, while EPDM is highly flexible but significantly more expensive.

Is HDPE safe for fish ponds?

Yes. HDPE is chemically stable and does not release toxins, making it safe for ornamental fish ponds and garden water features.

Is a 1.5mm HDPE membrane sufficient for basements?

Yes, provided it is properly installed, protected, and made to GM13 standards.