Max depth for PT timber

[cbinder]

I am looking at a case where the entire walls of a house basement are made of PT timber and I am wondering what the current code (IBC) says about the maximum depth that PT timber can be used to. Also, if anyone has any knowledge on what building code was enforced in 1986, that would be great. I found the 1985 Uniform Building Code and something on wood retaining walls.

 

[XR250]

I think APA has a document on Permanent Wood Foundations.

 

[racookpe1978]

What state (province) and which country?
Frost line problems, or are you in a civilized section of the world that doen't freeze solid every year?

 

[cbinder]

Eastern Washington, USA, with a frost depth of 24". In the 1985 UBC, I found a piece on wood retaining walls that says "Wood used in retaining or crib walls shall be treated
wood." But I am wondering if there is something more specific.

Thanks

 

[SlideRuleEra]

cbinder - Treated lumber is a subject in itself. There are (and were in the 1980's... plus long before) several chemicals that that are for use under various conditions, from "above ground" to seawater marine submerged.

http://www.SlideRuleEra.net

 

[cbinder]

I actually found some answers. For today's references into using wood for foundations, you have to follow the AWC PWF (Permanent Woof Foundation) code. Back in 1985 you had to conform to UBC Standard 29-3 which is the AWC PWF actually replaced.

Thanks for the help!