EN 12056-3:2000
(Main)Gravity drainage systems inside buildings - Part 3: Roof drainage, layout and calculation
General Information
- Abstract
This European Standard applies to wastewater drainage systems, which operate under gravity. It is applicable for drainage systems inside dwellings and commercial, institutional and industrial buildings. This third part of this European Standard describes a method of calculating the hydraulic adequacy of non-siphonic roof drainage systems and gives performance requirements for siphonic roof drainage systems. It also sets standards for the layout and installation of roof drainage insofar as they affect flow capacity.
- Status
- Published
- Publication Date
- 20-Jun-2000
- Technical Committee
- CEN/TC 165 - Waste water engineering
- Drafting Committee
- CEN/TC 165/WG 21 - Drainage systems inside buildings
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 18-Nov-2021
- Completion Date
- 23-Sep-2026
Overview
EN 12056-3:2000 is a CEN European Standard for gravity drainage systems inside buildings, specifically addressing roof drainage, layout and calculation. It applies to drainage systems operating under gravity in dwellings and commercial, institutional and industrial buildings. Part 3 describes a method to calculate the hydraulic adequacy of non-siphonic roof drainage systems, gives performance requirements for siphonic roof drainage systems, and sets layout and installation requirements insofar as they affect flow capacity.
Key Topics and Requirements
- Scope: Applies to internal gravity drainage for roofs in residential, commercial and industrial buildings.
- Hydraulic calculation: Presents a method to assess the hydraulic adequacy of non-siphonic roof drainage systems (methodology for sizing outlets, gutters and downpipes with respect to rainfall runoff).
- Siphonic systems: Defines performance requirements for siphonic roof drainage (criteria for non-pressure operation, flow performance and safe functioning).
- Layout and installation: Sets rules for layout that affect flow capacity - positioning of outlets, gutter gradients, downpipe routing and prevention of air-locks or surcharge conditions.
- Flow capacity considerations: Emphasises maintaining drainage capacity through correct installation, avoiding obstructions, and accounting for roof geometry and drainage discharge points.
- Applicability: Intended for designers, installers and verifiers working on internal roof drainage systems using gravity or siphonic principles.
Practical Applications
- Design and sizing of roof drainage systems (gutters, outlets, downpipes) to ensure safe evacuation of rainwater.
- Hydraulic calculations for compliance with building regulations and performance verification in new construction and renovation projects.
- Specification of siphonic roof drainage performance limits and layout to achieve water-tight, non-surcharging operation.
- Guidance for roofing contractors, plumbing engineers, building services engineers, architects and building inspectors on best practices for layout and installation.
- Useful for facility managers and maintenance teams to understand operational requirements and troubleshooting of roof drainage.
Who Uses This Standard
- Plumbing and drainage engineers
- Roof and building services designers
- Architects and construction contractors
- Building code officials and compliance assessors
- Facilities and maintenance personnel
Related Standards
- Other parts of the EN 12056 series (covering general principles and internal sanitary drainage) and relevant national building codes and plumbing regulations should be consulted alongside EN 12056-3:2000 to ensure full compliance.
Keywords: EN 12056-3:2000, roof drainage, gravity drainage systems, non-siphonic roof drainage, siphonic roof drainage, hydraulic calculation, layout and installation, roof drainage systems.
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Referred By
EN 16941-1:2018 - On-site non-potable water systems - Part 1: Systems for the use of rainwater - Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Referred By
EN 16941-1:2024 - On-site non-potable water systems - Part 1: Systems for the use of rainwater - Effective Date
- 28-Jan-2026
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DIBt (Deutsches Institut für Bautechnik)
German Institute for Building Technology.
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Frequently Asked Questions
EN 12056-3:2000 is a standard published by the European Committee for Standardization (CEN). Its full title is "Gravity drainage systems inside buildings - Part 3: Roof drainage, layout and calculation". This standard covers: This European Standard applies to wastewater drainage systems, which operate under gravity. It is applicable for drainage systems inside dwellings and commercial, institutional and industrial buildings. This third part of this European Standard describes a method of calculating the hydraulic adequacy of non-siphonic roof drainage systems and gives performance requirements for siphonic roof drainage systems. It also sets standards for the layout and installation of roof drainage insofar as they affect flow capacity.
This European Standard applies to wastewater drainage systems, which operate under gravity. It is applicable for drainage systems inside dwellings and commercial, institutional and industrial buildings. This third part of this European Standard describes a method of calculating the hydraulic adequacy of non-siphonic roof drainage systems and gives performance requirements for siphonic roof drainage systems. It also sets standards for the layout and installation of roof drainage insofar as they affect flow capacity.
EN 12056-3:2000 is classified under the following ICS (International Classification for Standards) categories: 91.060.20 - Roofs; 91.140.80 - Drainage systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 12056-3:2000 has the following relationships with other standards: It is inter standard links to EN 12056-5:2000, EN 12056-4:2000, EN 16893:2018, EN 12056-2:2000, ENV 13801:2000, EN 16904:2025, CEN/TR 17426:2019, EN 16578:2016, CEN/TR 13801:2014, EN 16941-1:2018, EN 12056-1:2000, EN 16941-1:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 12056-3:2000 is associated with the following European legislation: EU Directives/Regulations: 93/38/EEC; Standardization Mandates: M/BC/CEN/88/15. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN 12056-3:2000 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Schwerkraftentwässerungsanlagen innerhalb von Gebäuden - Teil 3: Dachentwässerung, Planung und BemessungRéseaux d'évacuation gravitaire a l'intérieur des bâtiments - Partie 3: Systeme d'évacuation des eaux pluviales, conception et calculsGravity drainage systems inside buildings - Part 3: Roof drainage, layout and calculation91.140.80Drenažni sistemiDrainage systems91.060.20StreheRoofsICS:Ta slovenski standard je istoveten z:EN 12056-3:2000SIST EN 12056-3:2001en01-december-2001SIST EN 12056-3:2001SLOVENSKI
STANDARD
SIST EN 12056-3:20
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