Category 3 Roof Drainage

Bs en 12056 3 2000 gives rainfall intensity in litres per second per square meter for a 2 minute storm event.

Category 3 roof drainage.

The return period chosen is 4 5 times the life of the building. A gutter also known as a conductor pipe is a shallow trough that is placed beneath the edge of the roof to carry excess water away from the building. Use fi gure nb5. A siphonic roof drain utilizes siphoning as a drainage mechanism resulting in drainage that is faster than that on any other type of roof drain.

For the highest possible security. Areco parapet wall flat roof drainage outlet 100mm x 100mm 12 50 ex vat 15 00 inc vat caroflow 150mm 90 degree threaded flat roof drainage outlet dome grate. The maintenance and durability of gutters depend on the materials. Interpolate between figures nb3 and nb4.

Category 3 when a higher degree of security is desired than that provided by category 2 a return period of 4 5 x the anticipated. Bs en12056 3 2000 gravity drainage systems inside buildings. The key factor to note about design rainfall in the uk is that it is based on summer thunderstorm conditions thus it is of very short duration two minutes and is heaviest in the driest parts of the country where the worst. The water is then removed from the roof area via the drainage outlets.

Roof drainage layout and calculation was published in 2000. Roof drainage calculations to bs en 12056 3 2000 gravity drainage systems inside buildings part 3. To use gutters as a drainage system there must be a slight gradient in your roof to direct excess water to gutters. Roof drainage layout and calculation.

For example a nuclear facility. Sensitive building use for example hospitals computer rooms 4 5 60 270 years consult the meteorological map that best reflects the figure obtained look at the site location and you will get the rainfall intensity for the project. For the uk the maps in the standard show the intensity for various return. For buildings requiring a higher degree of security.

For a flat inverted or green roof the discharge capacities can be up to a third less than a traditional roof with a fall of 1 60 or more. Siphonic roof drain. This manual provides comprehensive guidance on how roof drainage systems for buildings should be designed using information given in european standard 12056 3 2000 gravity drainage systems inside buildings part 3. The manual is intended to be used in conjunction with.

Commonly used on flat commercial roofs siphonic drains allow for a minimal number of drains and all of the drains can be connected to a single leader.