Roof Drain Pipe Size Calculator

For household sinks the drain pipe diameter is often either 1 5 or 2.

Roof drain pipe size calculator.

To size the vertical roof drain for the same parameters 5 000 square feet of room area and 6 per hour of rain consult table 1106 2 figure 3. This will allow the total pipe drop or fall to be calculated. Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow. 50 000 4 400 11 36.

The sizing of the roof drainage system must consider all components. Next measure the length of the pipe you are working with. Take the roof s total square footage and divide by the total square footage handled by one drain. The roof drainage outlets and rainwater downpipes are calculated based on the design principles for gravity drainage systems established in ss525 2006 code of practice for drainage of roofs.

Divide total roof area by area found in step 3 to obtain the number of drains required example. Factors which affect proper roof drainage are deck slope drain size and placement of drains. The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain. Divided by the 4 600 sq.

Therefore the 100 000 sq. According to the chart for 1 8 slope per 12 of pipe for 5 000 square feet of roof area with a 6 per hour of rainfall the required pipe size is 8. The result is the number of drains needed. This reveals that the minimum size for the leader pipe is 5.

Pipe grates and covers. Toilet waste lines are often 3 or 4. Equals 32 6 or 33 drains required. Area roof will require 100 000 3070 32 5 or 33 roof drains for ideal drainage.

That is what is wrong. Catch basin drain grates. All the fixtures in your house will connect to a main drain line which is usually 4 in diameter. The rain storm the flow of rainwater on the roof surface the ability of the roof drain to move the water from the roof to the piping the vertical piping the horizontal piping and the connection to the point.

Nds pop up drain. Dry well drainage systems and kits. Catch basin universal outlets drain adapters. 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.

I downloaded installed and tried out harmer drainage s free roof drainage calculator for a flat roof choosing a roof drain product line which has implications of drain pipe diameter and thus capacity geographic area the tool can plug in rainfall rates for the u k and i used an assumed a roof area of 10x10m 100 m2. But this isn t the whole story. The pipe sizing is only one component. Round spee d catch basins.

Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3 070 sq.