Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Discharge storm piping onto lower roof?

Discharge storm piping onto lower roof?

Discharge storm piping onto lower roof?


Is it acceptable by code to discharge storm piping from a higher roof of a building onto a lower roof? This lower roof is a pitched roof, and it's associated gutters/downspouts would be sized accordingly to accommodate the additional storm water from the higher roof.

Thanks for the help

RE: Discharge storm piping onto lower roof?

Discharge to lower roofs a lot, though not to a sloped roof. If the gutters/downspouts are sized for it, I don't see any issue.

But, verify with the AHJ to save potential heartburn.

RE: Discharge storm piping onto lower roof?

Don't know about code, but the reality in heavy rain is that the channel of water running into the gutter becomes too much for the gutter and it escapes onto the floor.

It also generally becomes a different colour where the water is a film and grows things that the other part of the roof doesn't.

So in practice needs something to deal with the storm flow velocity and aesthetically doesn't look good after a year or two.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


eBook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close