×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Residential attic live load

Residential attic live load

Residential attic live load

(OP)
Hopefully this is easy for some of you. I’m PE but 99 percent of my work is in steel and concrete (nuclear/industrial). Anyway, I’m helping my contractor out. He has a double true hoist spanning under a load bearing wall that the inspector wants a letter for. The double true joist is not adequate when considering dead plus a live load of 40 psf.

The space the wall supports is an unfinished attic with joists spaced two feet, so nobody is going to be walking up there and I highly doubt they will even put plywood down.

My question is does the code allow us to neglect live load here? Going off memory the LL for unfinished attic is 40 psf which will kill it.

RE: Residential attic live load

We've used 10 psf for unfinished (non-occupied) attic live loads.
However, we don't combine that LL with any roof snow (non-concurrent)

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

RE: Residential attic live load

In Ireland/UK an unoccupied attic imposed storage load is 0.25kN/m sq to cover the christmas tree and suitcases!

If the attic has been converted we’d use 1.5kN/m sq.

RE: Residential attic live load

(OP)
Ok thanks. I’m not worried about anything failing, but I don’t want my reputation at stake if I’m not following code. I don’t know how much these inspectors dig.

RE: Residential attic live load

(OP)
Good deal. That may get it. I didn’t look at asce 7, just IRC.

RE: Residential attic live load

Interesting that the US storage load is almost 4 times the Irish equivalent!

RE: Residential attic live load

The live load for attics that are not habitable range from 10psf - 20psf. The code requires that you design it for 20 psf if the space in the attic is large enough to fit a certain size box. The idea is that if there is space for a box someone will eventually put one up there.

The 10 psf load does not need to be combined with roof live load. The 20 psf does. See the footnotes to the table in ASCE 7 that JAE posted for the limitations as to when you need to consider the higher storage load.

RE: Residential attic live load

It will be 10 or 20 psf. See the footnotes to determine if yours is considered "with storage" or not.

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! Already a Member? Login


Resources

White Paper - Reliability Verification for AI and ML Processors
Artificial intelligence and machine learning are seeing growing adoption in a wide range of applications. ICs used for AI/ML applications are characterized by large parallel processing computation units, high power dissipation, and complex circuitry that can deliver maximum performance within a strict power budget. 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