×
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

What rebar to put in standard residential foundation wall with a crawl space?

What rebar to put in standard residential foundation wall with a crawl space?

What rebar to put in standard residential foundation wall with a crawl space?

(OP)
What do you all need for foundation wall reinforcement in a standard residential project with a wood framed first floor and crawl space underneath it like in the image below? Do you need to worry about designing this wall and footing like a basement wall for the lateral earth pressures? Or is it OK to just put some nominal amount of reinforcing. What do you typically put in terms of vertical and horizontal bars, and how far do you space your footing dowels?
Lastly, do you know if they typically excavate the crawl space down to the top of footing elevation like I have it shown or do they excavate just to about -18" below structure per code? Obviously this question is only important if you footing is lower for frost requirements.





RE: What rebar to put in standard residential foundation wall with a crawl space?

I've been doing two bars top and bottom in the stem wall with those adding up to 0.18% of the stem. #4 verts @ 48" oc assuming that lateral loads can be handled with plain concrete strength. No real rationale other than a desire to be cheap, have things generally not fall apart, and have some capacity to span soil soft spots.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: What rebar to put in standard residential foundation wall with a crawl space?

If I recall correctly, by the 2015 International Residnetial Code [IRC] the max. allowable soil differential after which you need to start thinking about doing a design (as per the design codes) is about 48" (where there is no lateral restraint for the wall at the top & bottom). If you have more than that (unbalanced by the load on the other side) that's where a engineered design comes in. In the IRC they have several prescriptive designs (assuming you are in the right seismic design category) that have wall footings without reinforcement.

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 - Implementing a Multi-Domain System
IoT systems are multi-domain designs that often require AMS, Digital, RF, photonics and MEMS elements within the system. Tanner EDA provides an integrated, top-down design flow for IoT design that supports all these design domains. Learn more about key solutions that the Tanner design flow offers for successful IoT system design and verification. 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