- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 14 Jul 2021
In very broad terms, it refers to a vertical pipe or stack that spans through one or more floors and into which drains from a property are connected to take waste water to a sewer. Branch drains run relatively horizontally from water closets, sinks, showers and so on to the vertical drainage stack which then connects to a relatively horizontal sewer at its lowest point. It may be referred to as a vent stack above the point that drains connect to it, as a drain stack below the point at which waste water drains into it and as a soil stack below the point at which sewage drains into it.
In the UK, particularly in domestic construction, it may be referred to as a soil vent pipe (SVP). Soil vent pipes allow the removal of waste from toilets, showers, baths, sinks and so on, while also allowing odours to be released above the building, via a stack vent, at a level that will not cause a nuisance. The pipe’s vent also allows air into the internal drainage system preventing a siphoning affect from occurring, and allowing free flow of waste water by gravity. An SVP may also be described as a soil stack pipe, drain waste vent or ventilated discharge pipe and is often seen on an outside wall of domestic buildings, but may located internally.
When installing drainage and ventilation pipework in high-rise buildings, traditional design standards dictate that a secondary ventilation stack has to be used to overcome air pressure changes. However, products such as the Polypipe Terrain P.A.P.A® and Pleura valves are a proven alternative to traditional secondary vented drainage systems. The P.A.P.A® (positive air pressure attenuation) valve is designed to react to and attenuate positive pressure transience within the drainage stack of high-rise developments providing a suitable venting solution for any multi-storey building.
 Related articles on Designing Buildings Wiki
- Air admittance valve.
- Fabricated drainage stacks.
- Pumps and dewatering equipment.
- Rain gutter.
- Rainwater goods.
- Rainwater downpipe.
- Sanitary pipework.
- Secondary Ventilation Stacks in Tall Buildings.
- Sewer construction.
- Soil vent pipe.
- Sustainable urban drainage systems SUDS.
- Vacuum breaker.
Featured articles and news
Creating comfortable climates despite extreme temperatures.
Study examines how adjustable arrangements can succeed.
Government announces plans to improve accessibility.
Resource addresses pandemic-related NEC4 contract issues.
Incorporating EDI into the provision of fair access.
Government announces global innovation strategy.
An architectural biography. Book review.
The house where the future king of France lived.
The teacher, architectural technologist and mum offers her insights.
Careful planning needed as supply chain issues continue.
The sensitive conversion of a neglected Cornwall structure.
Plan stresses local involvement in city, town and village development.