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I am looking to build a home with 12 inch logs. I first thought I could get away with only 8 inch foundation walls, but my architect says I should use 10 inch thick. I don't want to double guess him, but has anyone built with 12 inch logs on 8 inch foundation walls. I would like to keep the foundation cost down, but, of course, do not want to endanger the integrity of the building

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James, Is this a poured wall or unit masonry? Firstly, A brick veneer home weighs more than most log homes........Concrete wall thickness is based on "lateral loading" mostly.........concrete is pretty strong stuff......If you use 3500 psi concrete (vertical load)......You can do the math on this.....1" of a 10" wall would support 35,000. pounds. What is most important is the length of wall without lateral support and the height of the back fill (lateral load).....type of soil conditions do come into play......I have seen plenty of basement failures which had nothing to do with thickness of concrete. Just poor/stupid building practices. If you would post your dimensions and height of back fill, I could look it up in my tables here and advise.
you only get one chance at it ?bigger the better!no such thing as a foundation too strong?i would go with 12 inch.
Logdog, You are annoying........There is no reason to overbuild and waste money!!!! Overbuilding is usually a result of ignorance......concrete is a pretty well documented material.
8" is perfectly fine. I always specify that size and have never had a problem. Concrete is tremendously strong in compression. Going any thicker is a waste of money. And by the way we average 15" diameter logs and often build for areas with 100 lbs per square foot snow load or more. 8" always passes code, the inspector and the engineer if needed.

Bob Warren
thank you Tim!
Our handcrafted home is built with 12 inch logs (average) and we used 8 inch ICF for our basement. We used 3/8" and 1/2" reinforcement every 16 inches. This was approved by an engineer. We have a walk out basement with a stepped foundation.
I just had my basement worked up. Hope I describe it clear. We decided to go with an ICF basement wall height of 11 feet. 32inches of height above the floor, 16-14 inches taken up by floor joists which will be hung, then remainder down to the basement floor slab. So in affect we will be running a chair rail around the entire of the house. This will accomplish the height necessary to keep the logs off the ground and create a one step height into the house. The ICF Company wanted 10 inches forms with this type of wall height

8" should be fine, the rebar is your strength, With a log home, especially if they are screwed/lagged together, the logs will hold themselves up (unlike any other building construction) taking and equalizing the load. Upsizing the rebar is better most of the time than the beam width.
Alan, Concrete strength is based on the mix......2000 psi is less expensive than 4000 psi due to the additives.......portland cement is one of the most expensive additives.


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