German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Waterproofing
1Key Takeaways
DIN 18336 German construction contract procedures (VOB) – Part C: General technical specifications in construction contracts (ATV) – Waterproofing Scope of application: This standard specifies the general technical contract conditions for waterproofing works in construction contracts according to the German Constructi…
2Expert Interpretation
This comprehensive analysis of the latest German waterproofing engineering standard, DIN 18336:2023, covers the technical requirements and construction specifications for seven major waterproofing scenarios, including roofs, basements, and interior spaces. It compares the updated highlights of the 2019 version and provides standardized construction plans and engineering quantity calculation guidelines.
Standard Evolution Background
DIN 18336:2023 replaces the 2019 version and was revised and issued by the German Building Tenders Authority (DVA). Key changes include adapting technical content to developments in the construction industry and updating references as of April 2023. This standard dates back to DIN 1971 in 1925 and has undergone 16 revisions to reach the current 33-page technical specification.
Core Application Scope
| Waterproof Type | Applicable Scenarios | Exclusions |
|---|---|---|
| Roof Waterproofing | Balcony/Corridor/Loggia | Enclosed Construction Buildings |
| Concrete Traffic Surfaces | Underground Contact Components | Hazardous Material Protection Systems |
| Indoor Waterproofing | Containers/Pools | Landfill Projects |
Material Technical Requirements
Key Material Standards
- Bitumen membrane: Polymer modified asphalt welding membrane in accordance with DIN EN 13707
- Plastic waterproofing sheet: 1.5mm thick PVC-P-BV type, meeting DIN EN 13956
- Grouting material: Acrylic gel must contain 4 components, polyurethane gel ratio of 1:1 to 1:10
- Greening waterproofing: Must pass the root penetration test of 8 plant containers
Key Points of Construction Specifications
1. Roof waterproofing system
Bitumen membrane construction requires double-layer laying: the lower layer uses PYE-KTG KSP 2.8 Self-adhesive membrane, with PYE-PV 200 S5 mineral granular membrane as the top layer. The edges must be fixed with aluminum profiles, with a spacing of ≤ 20 cm.
2. Basement Waterproofing
Different solutions are adopted according to the water pressure level:
Grade W1-E: 3mm thick PMBC coating + protective layer
Grade W2.2-E: Three layers of PYE-PV 200 DD membrane (including copper tape layer when water depth >9m)
3. Post-construction Waterproofing
For existing buildings:
• Non-pressure water: 3mm thick PMBC vertical waterproofing
• Pressure water: Acrylic gel injection construction
Calculation Rules for Engineering Quantities
| Unit of Measurement | Calculation Rules | Overcalculation Threshold |
|---|---|---|
| Area (m²) | According to the actual treatment area, including reverse slope joints | Single hole>2.5m² |
| Length (m) | Take the maximum expanded size | Interval>1m |
| Grouting project | Outermost hole spacing + 1 hole spacing to compensate for edge effect | - |
Implementation recommendations
- Base treatment: The concrete surface needs to be mechanically treated and meet the flatness requirements of DIN 18202
- Joint treatment: Movement joints need to use metal profiles + 50cm wide reinforcement layer
- Acceptance criteria: Liquid coatings need to be tested for dry film thickness (PMBC≥3mm)
- Special protection: Green roofs should use root barrier waterproof membranes