Member Login

Remember Me
Forgot Password?
Join Us!

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!

Join Eng-Tips
*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.

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Frost Depths

Frost Depths

Wisconsin Enrolled Commercial Building Code and BOCA both, similarly state " walls, piers and other permanent supports of buildings and structures ...shall extend below the frost line of the locality.

As a general rule in my area of Wisconsin, we assume frost levels to be 40-48" below grade.  This, however, has only been, to my knowledge, a well-accepted common assumption.

I need to determine the frost depth in Philips, Wisconsin, which is further north from my area.

Does anyone have or know of a handy map, chart or useful reference showing frost depths per locality?

Thank you!

RE: Frost Depths


Thank you for your effort, but I cannot get the link to work!  Any other suggestions or comments?

RE: Frost Depths

I've used 48" depth in that area for more than 30 years.  You could call any one of the Dept of Comm. S&Bldg. divisions and they'll clue you in.

RE: Frost Depths

If you find one let me know, I am still looking. See my question Thread256-74708. With all those answers I still can not find a map showing the actual frost depth for specific locations.

RE: Frost Depths


You need to click on 82.30, scroll down, click 'More' about 4 times until you reach Comm 82.30(11)(c)2.d. Then load a 56 page pdf file.
Map of frost zones is Figure 82.30-1 (on page 12 of file);
Table of frost depths per type of (backfilled) soil & frost zone is Table 82.30-6 on following page.

Results: Phillips is in Price County --> Zone C.
Predicted Depth per Soil type in Zone C:
Clay & clay loam 3.5 feet, Silt loam & silty clay loam 4.5, Sandy clay loam 5.5, Sandy loam & loamy sand 6.0, Sand 6.5, gravelly sand 9.0 feet.
This was in the Plumbing Section re minimum burial depths.

You can search Wisconsin statutes from

I also found references to the following document which may be of interest:
U.S. Army (1985) Pavement design for seasonal frost conditions. U.S. Army Technical Manual TM 5-818-2.

RE: Frost Depths

Call the building inspector, he should know what is required and is going to issue a construction permit at some point and you might as well get to know him.

RE: Frost Depths


I have contacted Wis Comm Dept.  The plan reviewer I spoke with told me frost depth is no longer considered as part of the Wis plan review.


Check out (kenvlach) for Wis, and (PEinc) for extreme depths.  Both helpful.


Thank you, very much, for your time and effort.


Thank you, very much, for your time and effort.  The values on the map are definitely extreme.


I will contact the local inspector.  Thank you!

To all:

Dependant upon the significance of the project, I recommend hiring a soils engineer to obtain all pertinent information necessary for designing an adequate foundation.  I will be receiving a soil report for my project in a few weeks.  I just wanted some early insight for various reasons.  

Thank you all for your time, effort and support!

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!


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