German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Waterproofing
1Key Takeaways
This standard applies to waterproofing works for roofs, balconies, corridors and covered passages, including waterproofing treatment of concrete drivable traffic surfaces, underground building components, indoor spaces, containers and tanks, as well as the construction of necessary insulation layers, moisture-proof lay…
2Expert Interpretation
This in-depth analysis of the German DIN 18336:2019-09 technical standard for waterproofing projects covers comprehensive waterproofing requirements for roofs, basements, and interior spaces. It also includes detailed analysis of material selection, construction techniques, acceptance criteria, and solutions for special working conditions, providing authoritative technical guidance for building waterproofing.
DIN 18336:2019-09 Core Changes and System Restructuring
The German waterproofing standard DIN 18336:2019-09 marks a significant evolution in the technical specifications for building waterproofing. Developed by the German Board for Tenders and Contracts (DVA), this standard replaces the three previously independent standards DIN 18336:2016-09, DIN 18338:2016-09, and DIN 18354:2016-09, achieving a unified and integrated standard for waterproofing.
Structural Adjustments to the Standard Structure
The core change in this revision is a fundamental restructuring of the technical system: a shift from a classification based on water load types to one based on building components. This change also impacts the structure of relevant VOB standards, which are fully reflected and implemented in this edition of DIN 18336.
| Standard version | Scope | Classification system | Reference standards |
|---|---|---|---|
| DIN 18336:2016-09 | Partial waterproofing | Types of water loads | DIN 18195 series |
| DIN 18338:2016-09 | Roofing waterproofing | Types of water loads | DIN 18195 series |
| DIN 18354:2016-09 | Pouring asphalt | Material type | DIN 18195 series |
| DIN 18336:2019-09 | All waterproofing projects | Building components | DIN 18531-18535 series |
Technical specification system for waterproofing materials
Chapter 2 of the standard clarifies the technical requirements for materials and components used in waterproofing projects and establishes a complete material performance indicator system.
Core Material Categories and Technical Indicators
Bitumen Waterproofing Membrane
According to DIN EN 13707, polymer modified asphalt membranes must meet the following technical requirements:
- PYE-KTG KSP 2.8: Cold self-adhesive polymer asphalt membrane for insulation base layer
- PYE-G 200 S4: Polymer asphalt welding membrane with static puncture resistance
- PYE-PV 200 S5: Shale surface polymer asphalt membrane with enhanced surface protection
Plastic and Elastomer Waterproofing Membrane
According to DIN EN 13956, PVC-P waterproofing membranes must meet the following requirements:
- Thickness ≥ 1.5 mm, reinforced, asphalt compatibility
- Mechanically fixed installation, loose laying
- Compliant with DIN SPEC 20000-201 Application Standard
Liquid Waterproofing Materials
Two-component polyurethane resin (2K-PUR) waterproofing system:
- Use 110g/m² plastic fiber felt reinforcement layer
- Minimum dry film thickness 2.1mm
- Requires ETAG 005 European Technical Certification
Technical Requirements for Waterproofing Construction
Chapter 3 of the standard specifies in detail the construction technical requirements and quality control standards for various types of waterproofing projects.
Roofing waterproofing project
Asphalt membrane roofing system
Construction requirements for double-layer asphalt membrane roofing waterproofing system:
- Lower membrane: Use cold self-adhesive membrane for the insulation base layer, and welded membrane for other base layers
- Upper membrane: Shale-faced polymer asphalt welded membrane
- All membranes must comply with DIN EN 13707 and DIN SPEC 20000-201
Detailed construction
Detailed construction such as edge flanging and wall connection:
- Use insulation wedge strips of at least 50mm×50mm
- Lower additional layer: Approximately 33cm wide polymer asphalt welded membrane
- Upper additional layer: Approximately 50cm wide shale-faced polymer asphalt welded membrane
Underground structure waterproofing project
Waterproofing grade classification
According to DIN 18533 standard, underground waterproofing is classified according to water action grade:
| Water action grade | Water pressure condition | Waterproofing requirements | Minimum thickness |
|---|---|---|---|
| W1-E | Soil moisture and non-hydrostatic pressure water | Polymer modified asphalt thick coating (PMBC) | 3mm (two coats) |
| W2.1-E | Hydrostatic pressure ≤3m | PMBC plus reinforcement layer | 4mm (two coats) |
| W2.2-E | Hydrostatic pressure>3m | Polymer asphalt membrane | 2-3 layers |
Waterproofing treatment of post-cast strips
Waterproofing treatment of expansion joints is determined according to the water action level and deformation level:
- W1-E, W2.1-E grades: Use asphalt-compatible plastic sealing tape with a non-woven fabric covering for embedding PMBC
- W2.2-E, W3-E grades: Use 50cm wide polyester non-woven fabric reinforced polymer asphalt membrane
- The joints must be welded, and the embedding width must be at least 10cm
Rules for calculation and pricing of project quantities
Chapter 5 of the standard specifies the rules for calculation of project quantities and pricing methods for waterproofing projects.
Division of measurement units
| Units of measurement | Scope of application | Calculation rules |
|---|---|---|
| Area (m²) | Wall waterproofing, baseboard waterproofing, roof waterproofing, etc. | According to the actual construction area, distinguish between slope and structural type |
| Length (m) | Expansion joint waterproofing, horizontal moisture-proof layer, joint treatment, etc. | Calculated according to the center line length, distinguish between slope |
| Quantity (pieces) | Reserved holes, pipe root treatment, special components | Calculated according to the actual number, distinguish between type and size |
| Mass (kg, t) | Pouring asphalt, void filling, base treatment | Calculated according to actual usage |
Excess calculation rules
The standard clarifies the specific rules for excess calculation:
- Area measurement: Holes, penetrations, etc. with a single area greater than 2.5m² require excess calculation
- Length measurement: Interruption length greater than 1m requires excess calculation
- Setback joints: Included in both the base slab waterproofing area and the wall waterproofing area
- Ridges and gutters: Simply measured by the center line length
Handling of special working conditions and technical measures
Construction under adverse weather conditions
Article 3.1.2 of the standard stipulates special treatment requirements under adverse climatic conditions:
- Special measures need to be taken under conditions such as damp base, temperature below 5℃, ice, snow and frost
- Consult with the owner to determine the specific technical plan
- The cost of related measures will be charged separately as special services
Injection waterproofing technology
Material requirements for post-grouting waterproofing technology:
- Acrylic ester gel: at least 4 components, the water component can be replaced by water-based plastic dispersion
- Polyurethane gel: the ratio of resin component to water component is 1:1 to 1:10
- Grouting materials for reinforced concrete components must not cause steel corrosion
Green roof waterproofing
Special requirements for the waterproof layer under the green roof:
- Must resist penetration by the roots of Agropyron repens
- Resistant to Alnus incana and Pyracantha coccinea root penetration
- At least 8 planting containers are required for the rhizome resistance test
- Use PVC-P waterproofing membrane with a thickness of ≥1.5mm, laid in a single layer
Implementation Recommendations and Quality Control
Pre-construction Technical Preparation
Chapter 0 of the standard provides technical guidance for compiling the bill of quantities, including:
- Detailed description of construction site conditions
- Specific requirements for waterproofing structures
- Clear material performance indicators
- Treatment plans for special working conditions
Key points of quality control
- Base treatment: Surface strength, flatness, and cleanliness must meet the requirements
- Material acceptance: All materials must meet the requirements of the corresponding standards
- Construction process control: Control of key processes such as coating thickness, overlap width, and node treatment
- Finished Product Protection: The waterproof layer must be promptly protected after completion to prevent damage.
Acceptance Criteria
- Appearance Inspection: The waterproof layer is continuous, complete, and free of defects.
- Dimensional Inspection: Thickness, overlap width, etc. must meet design requirements.
- Performance Testing: Water storage or water spray tests must be conducted when necessary.
- Document Acceptance: Construction records, inspection reports, and other information must be complete.
The implementation of the DIN 18336:2019-09 standard provides comprehensive technical specifications and a quality assurance system for German building waterproofing projects, which is of great significance for improving the quality of waterproofing projects and extending the service life of buildings. In actual projects, the standard requirements should be strictly adhered to, and detailed construction plans and quality control measures should be formulated based on specific project conditions.