Roof Scupper Sizing

Scuppers shall not have an opening dimension of less than 4 inches.

Roof scupper sizing.

Factors which affect proper roof drainage are deck slope drain size and placement of drains. The maximum allowable level of water on the roof shall be obtained from the registered design professional based on the design of the roof. Select number of roof drains and calculate the roof area sloped to each drain. Calculator notes and assumptions.

Calculator is based on chapter 1 of smacna s architectural sheet metal manual 7th edition asmm. 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. 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. 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.

Table d104 1 lists the discharge capacity of rectangular roof scuppers of various widths with various heads of water. Size horizontal storm drainage piping. 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. Determine 100 year 1 hour rainfall rate used for location of building.

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. Roof drain system and size the scuppers denoting the required head of water above the scupper for the structural engineer. 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. Size vertical storm drainage piping.

Smacna s new downspout and gutter sizing calculator enables the user to manually enter the design area of the roof or use the design area wizard for the calculation. 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.