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Fill the blocks or not to fill the blocks

Thats because it is. 10"x24" footing. That is the size of the footing not the burial
 
People seldom address me as bud. Shirley, you know we are not that familiar.







 
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So here is the deal. We see this a lot. Someone comes into our office asking a question that betrays how little they know about construction and to be fair in this case, it has nothing to do with your actual question, just the statement about what is "loadbearing". Many of us have enough experience in the construction industry that we see red flags when we have someone ask certain questions, not know basic design or construction criteria, etc.

So, you said you are under the international building code (IBC). Unfortunately, mtlogcabin's post is from the international residential code (IRC), which wouldn't apply here. The IRC contains prescriptive 'how to" options on completing construction. A cookbook analogy is usually how I describe it to people. The IBC in contrast prescribes the values and a little of the methodology to be used to calculate the design requirements for the structural elements of the building. It is almost always applied by structural engineers.

Will the IRC design work? Maybe. Hard to say without doing the structural calculations.
 
2018 IBC
[A] 101.2 Scope.
The provisions of this code shall apply to the construction, alteration, relocation, enlargement, replacement, repair, equipment, use and occupancy, location, maintenance, removal and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures.

Exception: Detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress, and their accessory structures not more than three stories above grade plane in height, shall comply with this code or the International Residential Code.
 
Pretty sure atvjoel meant IRC based on his previous thread(s) but your point is taken.

I would guess using IBC you might be able to get to a "less strong" design, but any savings probably eaten by design fees. :)
 
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