Roof Scupper Sizing

If you do know the diameter of the properly sized drain for your roof area however you can calculate the size of the equivalent scupper from that.

Roof scupper sizing.

Rainfall wizard is based on table 1 2 rainfall data and drainage factors page 1 2 1 3 of the architectural sheet metal manual 7th edition. Table d104 1 lists the discharge capacity of rectangular roof scuppers of various widths with various heads of water. The maximum allowable level of water on the roof shall be obtained from the registered design professional based on the design of the roof. Determine 100 year 1 hour rainfall rate used for location of building.

This wizard makes it easy to calculate the roof design area by providing various shape calculations and the calculation for vertical walls area per international plumbing code ipc. Scuppers shall not have an opening dimension of less than 4 inches. For the purposes of this appendix the following metric conversions are applicable. Factors which affect proper roof drainage are deck slope drain size and placement of drains.

Select number of roof drains and calculate the roof area sloped to each drain. Section 1503 4 2 scuppers when scuppers are used for secondary emergency overflow roof drainage the quantity size location and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by section 1611 1. If you re looking for technical guidelines for sizing and locating scuppers fm global s ds 1 54 roof loads for new construction data sheet is an excellent resource see the link below. 2014 fbc building 5 th edition 15 roof assemblies and rooftop structures 1514 high velocity hurricane zones weather protection 1514 4 roof drainage 1514 4 2 overflow drains and scuppers 1108 3 storm drainage sizing of secondary drains.

Ipc provides four steps to size the roof drains on a building. 1 in 25 4 mm 1 ft 305 mm 1 ft2 0 0929 m2 100 0 figure a101 1 example roof plan 4 a 101 2 solution. Roof drain system and size the scuppers denoting the required head of water above the scupper for the structural engineer. The full flow capacity of a drain is not realized until the water reaches approximately 2 5 above the inlet in a four inch drain and 3 5 in a six inch drain.

Calculator is based on chapter 1 of smacna s architectural sheet metal manual 7th edition asmm. Size vertical storm drainage piping.