Number Of Roof Drains In Terraces

This can become a domino effect as water will have nowhere to go creating standing pools of water.

Number of roof drains in terraces.

Number of roof leaders required is 10 100 000 sq. Sizing data for conventional drainage storm drainage sizing precipitation rate inches hour based on 15 minute precipitation. Number of drains required example. Leaders s ize m ax mu al owb eh rz n tp jc dr f open squarefeetatvariousrainfallrates pipesize area inches sq in.

The result is the number of drains needed. Equals 32 6 or 33 drains required. Ft therefore 10 roof drains would be required. Select number of roof drains and calculate the roof area sloped to each drain.

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. Or 12 drains required. Appendix b in the ipc provides rates of rainfall for various u s. The drainage condition.

A small amount of debris can completely clog the system. Divided by the 4 600 sq. 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. Number 2 roof drainage.

Cities based on inches per hour that may fall during a storm of one hour duration and a 100 year return period. 50 000 4 400 11 36. 6 24 2014 david howard aia said. Size horizontal storm drainage piping.

Size vertical storm drainage piping. Divided by 10 200 sq. Siphonic roof drain. The drains should be equally spaced and located symmetrically about the roof.

Be sure there is an adequate and appropriate number of drains for the size of your roof. Take the roof s total square footage and divide by the total square footage handled by one drain. In which consideration has been made for all loading deflections of the roof deck and additional slope has been provided to ensure drainage of the roof within 48 hours of precipitation chapter 2 2015 international building.