Roof Drainage System Design

Cities based on inches per hour that may fall during a storm of one hour duration and a 100 year return period.

Roof drainage system design.

Improper gutter drainage can cause erosion of soils and foundation issues. Select number of roof drains and calculate the roof area sloped to each 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. Roof drainage layout and calculations.

The manual is intended to be used in conjunction with bs en 12056 3 and contains separate chapters dealing with the following topics. 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. 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.

This results in the use of internal parapet gutters internal valley gutters and internal downpipes. Drainage solutions watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application. To prevent erosion make a rock bed around the end of the tube. 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.

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. The steps in the design process following the direction of flow through a rainwater system are described in the following. Our exclusive dual functional structural deck flange and combination roof drains streamline specifications saving installation time and labor. 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.

Size horizontal storm drainage piping. Size vertical storm drainage piping. 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. Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out.

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. 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. Let s say you are designing a large distribution warehouse for an online book retailer. Appendix b in the ipc provides rates of rainfall for various u s.

I examined several roof drainage calculators and tables to see what they tell us.