Flat Roof Scupper Size

There are 5 easy steps to figure out how many drains your commercial roofing project will need.

Flat roof scupper size.

If the scuppers are used as primary drainage then they are applied flush with the roof level. Scuppers can also be provided as primary or secondary drainage points. Calculate the total roof area by multiplying its length by width. Scuppers shall not have an opening dimension of less than 4 inches.

1 calculate the roof area to be drained. Calculate total roof area. 4 roof drain 3 determine your building s location on the above map to determine the approximate rainfall as measured in inches per hour. 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.

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

Determine 100 year 1 hour rainfall rate used for location of building. Factors which affect proper roof drainage are deck slope drain size and placement of drains. The gutter and downspout size requirement depends upon the number of sections and length of the gutter sections as well as the number of downspouts. Ipc provides four steps to size the roof drains on a building.

Scuppers can be installed to carry water into gutters or directly into downspouts through conductor heads. Select number of roof drains and calculate the roof area sloped to each drain. They can be used in conjunction with gutters and downspouts to divert the flow to the desired location. For the purposes of this appendix the following metric conversions are applicable.

2 estimate the roof drain outlet size you will likely use. 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. Roof area is 200 x 500 100 000 sq. 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.

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.