Roof Drainage System Design

Select number of roof drains and calculate the roof area sloped to each drain.

Roof drainage system design. The best type for the application depends on several factors such as the size and slope of the roof the desired appearance and how much regular maintenance the drain system might need. The manual therefore describes the various stages in the design of a roof drainage system but it is necessary to refer to bs en 12056 3 for particular figures or items of information. Where the tube passes by the downspout from the gutter we installed a y fitting and drained the roof water from the gutter system directly into the main drainage line. It is important for architects plumbing engineers and civil engineers to work together to design a system that will properly drain rainwater from a building and site.

To prevent erosion make a rock bed around the end of the tube. This results in the use of internal parapet gutters internal valley gutters and internal downpipes. I examined several roof drainage calculators and tables to see what they tell us. Cities based on inches per hour that may fall during a storm of one hour duration and a 100 year return period.

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. Please see roof drainage calculations for a detailed answer to your question. The manual is intended to be used in conjunction with bs en 12056 3 and contains separate chapters dealing with the following topics. Roof drainage is one of the fundamental considerations of building design.

To design a sloped or flat roof drainage system we need to know the anticipated maximum rainfall rate and the flat or projected roof area. Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out. The size of the building and the requirement for a slick appearance leads to a solution where the entire roof drainage system has to be concealed. From the very dawn of building construction it has been necessary to incorporate some method of gathering and discharging rainwater from the roof of a structure.

Size horizontal storm drainage piping. Roof drainage layout and calculations. Improper gutter drainage can cause erosion of soils and foundation issues. Drainage solutions watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application.

Roof drains for flat or low slope roofs come in a few standard types. Appendix b in the ipc provides rates of rainfall for various u s. Buildup of rainwater on a roof can cause structural damage and leaks. Our exclusive dual functional structural deck flange and combination roof drains streamline specifications saving installation time and labor.

The steps in the design process following the direction of flow through a rainwater system are described in the following.