WE have it.......(Add) R405.3 Above grade drainage. Above grade drainage systems, including but not limited
to, gutters and downspouts, roof drains, and yard drains, shall not be connected to the foundation
drainage system.
Mine were in before we got this and my footing drains are a pump so there is a check valve to make sure that the roof drainage does not flood the basement....Because that is the concern WHEN they get plugged....
steveray are you saying your local code add this section?
Is the downspout into a foundation drain something we regulate? Do we really have to explain to someone that the reason behind a foundation drain is to get water out? This ain't Texas.
A four inch diameter pipe can take a large volume of water. A foundation drain should see a trickle. What am I missing here?We do not permit it. Reasoning is that our code dictates that pipe used for foundation drainage is 100mm (4"). If you start using it for other things, then you need to provide hydraulic calculations for proper sizing (ie: engineer). most just run a solid pipe parallel with the perimeter drain.
We see straw to prevent frost below the foundation this time of year.
Draining a 3000 sq ft+ impenetrable roof surface with 6 to 8 4" rainwater leaders is a lot of water for a 4" draintile to handle. Particularly when your roof is full of snow and you start to see some heavy rains and above freezing temperatures.A four inch diameter pipe can take a large volume of water. A foundation drain should see a trickle. What am I missing here?
IPC Chapter 11 is for Storm Drainage and states that all storm drainage must discharge to a storm sewer system or combined system. R3 allows drainage to a sidewalk, driveway, etc, but must be away from the building. Since footing drains are perforated, roof water would not be "away" from the building. Storm drains must also slope 1/2" per foot which is not the case with footer drains.