Flat Roof Scupper Size

The only unconditional guideline for scupper sizing provided by the code is that scupper openings shall be not less than 4 inches 102 mm in height and have a width that is equal to or greater than the circumference of a roof drain sized for the same roof area so we can at least be certain that round scuppers can t have a diameter of.

Flat roof scupper size.

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. Scuppers are used to provide an outlet through parapet walls or gravel stops on flat and built up roofs to allow drainage of excess water. Calculate the total roof area by multiplying its length by width. Scuppers shall not have an opening dimension of less than 4 inches.

Scuppers can also be provided as primary or secondary drainage points. Roof drain system and size the scuppers denoting the required head of water above the scupper for the structural engineer. Factors which affect proper roof drainage are deck slope drain size and placement of drains. 2 estimate the roof drain outlet size you will likely use.

4 roof drain 3 determine your building s location on the above map to determine the approximate rainfall as measured in inches per hour. Calculate total roof area. Roof area is 200 x 500 100 000 sq. Scuppers are rectangular openings in parapet walls that are a minimum of 4 inches in width and height ranging from 4 to 6 inches.

They can be used in conjunction with gutters and downspouts to divert the flow to the desired location. 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. There are 5 easy steps to figure out how many drains your commercial roofing project will need. Select number of roof drains and calculate the roof area sloped to each drain.

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. 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. Ipc provides four steps to size the roof drains on a building.

If the scuppers are used as primary drainage then they are applied flush with the roof level. 1 calculate the roof area to be drained. Scuppers can be installed to carry water into gutters or directly into downspouts through conductor heads. Size vertical storm drainage piping.

Determine 100 year 1 hour rainfall rate used for location of building.