A high slope moves water more quickly and if gutters have trouble dealing with a lot of water in a short period of time an extra downspout can alleviate that issue.
How much clearnce do you need around a roof drain.
Roof drains for flat or low slope roofs come in a few standard types.
The four things you will need to know are.
The best type for the application depends on several factors such as the size and slope of the roof the desired appearance and how much regular maintenance the drain system might need.
The national kitchen bath association requires at least 24 inches clearance in front of a toilet.
Overflow drains shall be the same size as the roof drains with the inlet flow line two inches above the low point of the roof and shall be installed independent from the roof drains.
2 total area of roof.
In some cases drains can be offset to rise up in walls to avoid cleanout covers in high traffic areas.
The result is the number of drains needed.
3 size of leader required.
When sizing roof drains the limiting factor for the amount of water each drain will carry away is the size of leader therefore increasing.
Or 12 drains required.
Zurn makes it easy to size roof drains.
A large roof is going to move a lot of water which means the downspout locations may need to be adjust to compensate.
And 4 area handled by each drain.
Take the roof s total square footage and divide by the total square footage handled by one drain.
50 000 4 400 11 36.
1 rate of precipitation.