Polymer Modified Bitumen Root-Resistant Waterproofing Membra

Product Overview

This membrane is manufactured using a long-fiber polyester mat combined with a specialized composite reinforcement layer, which may include copper reinforcement or copper foil. The waterproofing coating is composed of SBS-modified bitumen blended with imported chemical root inhibitors.

Both surfaces are finished with polyethylene film, fine sand, or mineral granules, serving as protective and separation layers.

The system is designed to provide dual performance: long-term waterproofing and effective resistance to plant root penetration.

Product Features

Dual functionality: waterproofing and root resistance in a single system.
Strong resistance to root penetration while allowing normal plant growth.
High-performance waterproof layer with excellent resistance to hydrostatic pressure.
Superior puncture, tear, and fatigue resistance.
High tensile strength with thick modified bitumen coating, accommodating substrate movement, shrinkage, and cracking.
Excellent performance under both high and low temperature conditions, suitable for diverse climates.
Strong resistance to corrosion, mold, and weathering.
Hot-melt installation ensures fast application and durable, fully bonded seams.

Waterproofing Construction Guidelines

1. Substrate Preparation

The substrate must be clean, dry, firm, and smooth. Any uneven surfaces should be leveled, and sharp edges or internal corners must be rounded.

Apply primer evenly over the entire surface and allow it to dry completely before installation.

2. Reinforcement at Detail Areas

Critical areas such as internal and external corners, gutters, eaves, and expansion joints must be reinforced with additional membrane layers in accordance with relevant technical standards.

3. Standard Waterproofing Layer Installation

The SBS modified bitumen waterproofing layer is installed using the hot-melt method, ensuring full adhesion and continuous sealing.

4. Root-Resistant Waterproofing Layer Installation

The polymer-modified bitumen root-resistant membrane is installed using the same hot-melt method as standard modified bitumen systems, ensuring a fully integrated waterproof and root-blocking layer.

Scope of Application

Designed for green roofs, rooftop gardens, and underground structures requiring landscaping or vegetation systems.

The membrane effectively prevents plant roots from damaging structural waterproofing layers while maintaining reliable and long-term waterproof protection.

System Structure and Design Considerations

Layers

Slope-Forming Layer

Structural Slab

A typical green roof system is composed of the following layers (top to bottom):

Vegetation layer → Planting soil → Filtration / water-retention layer → Drainage layer → Protection layer → Polymer-modified bitumen root-resistant waterproofing layer → Standard SBS modified bitumen waterproofing layer → Leveling layer → Insulation layer → Slope-forming layer → Structural slab

Structural Slab

Slope-Forming Layer

Structural Slab

The structural slab must be cast-in-place reinforced concrete.

For roof slopes greater than 15%, anti-slip measures must be applied to the waterproofing, drainage, and planting layers. Slopes exceeding 50% are not suitable for planting systems.

Slope-Forming Layer

Recommended slope is approximately 2%.

For spans ≤ 4 m: cement-sand mortar may be used.
For spans 4–9 m: lightweight materials such as aerated concrete, ceramic concrete, expanded perlite mortar, or vermiculite mortar are recommended.
For spans > 9 m: structural slope formation is required.

Insulation Layer

Standard SBS Waterproofing Layer

Slope-Forming Layer

Materials such as polystyrene boards, polyethylene foam boards, or sprayed rigid polyurethane foam may be used.

Insulation may be omitted when soil thickness exceeds 800 mm.

Leveling Layer

Standard SBS Waterproofing Layer

Constructed using 1:2.5 cement-sand mortar with a thickness of 20–25 mm.

Expansion joints should be provided at intervals not exceeding 6 m.

Standard SBS Waterproofing Layer

A 4 mm or 5 mm SBS-modified bitumen membrane applied as a single-layer system using the hot-melt method.

Root-Resistant Waterproofing Layer

A 4 mm or 5 mm polymer-modified bitumen root-resistant membrane providing both waterproofing and root-blocking performance, installed using hot-melt application.

Protection Layer

Root-Resistant Waterproofing Layer

A 200 g/m² polyester non-woven fabric, loosely laid with a 200 mm overlap.

Drainage Layer

Root-Resistant Waterproofing Layer

Filtration / Water-Retention Layer

Options include:

Plastic drainage boards (8–20 mm stud height), or
Lightweight ceramsite or gravel (≤25 mm particle size), 80–100 mm thick

In dry regions (annual rainfall < 400 mm), or when soil thickness conditions allow, the drainage layer may be omitted.

Drainage boards with water-retention functions may also be used, requiring only a filtration layer above.

Filtration / Water-Retention Layer

Synthetic fiber mats or mineral wool pads (≥400 g/m²), loosely laid with 100 mm overlap. Seams should preferably be stitched.

If soil thickness exceeds 500 mm, this layer may be omitted due to sufficient natural water retention. A 200 g/m² polyester non-woven fabric may be used as an alternative filtration layer.

Planting Soil

Filtration / Water-Retention Layer

Planting Soil

Modified or engineered planting soil is recommended for rooftop applications, while standard garden soil may be used for basement roof planting systems.

Soil thickness should be determined according to plant species and vegetation requirements.

Polymer Modified Bitumen Root-Resistant Waterproofing Membra

Product Overview

Product Features

Waterproofing Construction Guidelines

Scope of Application

System Structure and Design Considerations

Layers

Slope-Forming Layer

Structural Slab

Structural Slab

Slope-Forming Layer

Structural Slab

Slope-Forming Layer

Slope-Forming Layer

Slope-Forming Layer

Insulation Layer

Standard SBS Waterproofing Layer

Slope-Forming Layer

Leveling Layer

Standard SBS Waterproofing Layer

Standard SBS Waterproofing Layer

Standard SBS Waterproofing Layer

Standard SBS Waterproofing Layer

Standard SBS Waterproofing Layer

Root-Resistant Waterproofing Layer

Root-Resistant Waterproofing Layer

Root-Resistant Waterproofing Layer

Protection Layer

Root-Resistant Waterproofing Layer

Root-Resistant Waterproofing Layer

Drainage Layer

Root-Resistant Waterproofing Layer

Filtration / Water-Retention Layer

Filtration / Water-Retention Layer

Filtration / Water-Retention Layer

Filtration / Water-Retention Layer

Planting Soil

Filtration / Water-Retention Layer

Planting Soil

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