Post Frame Standards in Building Codes
Reader DAN in INDEPENDENCE writes:
“We want to build a post frame building for a residence, I had seen post frame standards in earlier versions of the IRC but now can’t, is this here somewhere or what applies to using a post foundation for these?”
Thank you for reaching out, actually IRC (International Residential Code) has never directly referenced to post frame construction at all.
Let’s look at how (2021) Codes handle what Code actually applies.
2021 IRC R101.2 Scope.
“The provisions of this code shall apply to the construction, alteration, movement, enlargement,replacement, repair, equipment, use and occupancy, location, removal and demolition of 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.”
2021 IBC 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.”
2021 IRC R301.1.3 Engineered design.
Where a building of otherwise conventional construction contains structural elements exceeding the limits of Section R301 or otherwise not conforming to this code, these elements shall be designed in accordance with accepted engineering practice. The extent of such design need only demonstrate compliance of nonconventional elements with other applicable provisions and shall be compatible with the performance of the conventional framed system. Engineered design in accordance with the International Building Code is permitted for buildings and structures, and parts thereof, included in the scope of this code.
2021 IBC 2306.1 does reference applicable post frame standards:
We are building in a remote area and the trades are difficult to come by. I received a recommendation of a person who has been building fence for 20 years. He organized 2 Amish crews that have built 2 large pole barns. They set poles and framed in with 2×6 exterior walls. When we spoke about pricing I was told it would be $4.50 a sq foot. I have framed stick build for a lot less in the past. A local subdivision in the area is paying $3.50 a foot for stick built houses. My question is how do I determine if that is a fare price. I’m having a difficult time seeing how that price is valid. What am I missing? Any input would be appreciated. The zip code for the new build is 65571. Thanks.” 
