Roof Drainage System Design

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 system design.

Appendix b in the ipc provides rates of rainfall for various u s. 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. Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out. 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.

Drainage solutions watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application. Buildup of rainwater on a roof can cause structural damage and leaks. 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. 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.

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. I examined several roof drainage calculators and tables to see what they tell us. Roof drainage layout and calculations. Roof drainage is one of the fundamental considerations of building design.

This results in the use of internal parapet gutters internal valley gutters and internal downpipes. Please see roof drainage calculations for a detailed answer to your question. Roof drains for flat or low slope roofs come in a few standard types. In many cases early structures were designed primarily as a shelter from the rain their very purpose was to redirect rainfall and maintain a particular area.

Let s say you are designing a large distribution warehouse for an online book retailer. Size horizontal storm drainage piping. 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. Improper gutter drainage can cause erosion of soils and foundation issues.

Our exclusive dual functional structural deck flange and combination roof drains streamline specifications saving installation time and labor. Size vertical storm drainage piping. 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. Cities based on inches per hour that may fall during a storm of one hour duration and a 100 year return period.

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