AC478 and AC472 – a winning combination
Heimburger Construction, Inc. achieved AC478 accreditation for metal building assemblers in February of 2021. We are the first erector in the state of Missouri to achieve this accreditation.
IAS Accreditation for Metal Building Assemblers Inspection (AC478)
- The AC478 Accreditation program is the most comprehensive quality assurance accreditation of its kind for metal building assembly. It is administered by the IAS which is a sister company to the ICC responsible for creating the IBC codes.
It focuses on several key areas:
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- Documented training program following IAS guidelines
- Documented safety program following IAS guidelines
- Documented management system
- Onsite jobsite assessment by an independent third party.
- Annual verification of system updates and compliance with the safety and training programs
- This assures owners that the erector they have chosen follows a comprehensive quality driven metal building assembly program that has been assessed by an independent third party.
- Recognized by:
- Metal Building Contractors and Erectors Association (MBCEA)
- North American Iron Workers / IMPACT Labor-Management
- Metal Building Manufacturers Association (MBMA)
- International Code Council (ICC).

Butler Manufacturing has achieved the IAS Accreditation for Metal Building Systems Inspection (AC472)
- Verification that approved manufacturers meet requirements as described in Chapter 17 of the IBC.
- The benchmark for companies that design and manufacture engineered metal building systems.
- Provides a level of confidence that buildings will be designed and manufactured according to code and specifications.
- Recognized by the Metal Building Manufacturers Association (MBMA) and International Code Council (ICC).
Building Commissioning using ASHRAE Guideline 0-2019
Heimburger Construction, Inc. uses ASHRAE guideline zero to help clients determine the scope of work for their projects and create a living, updatable process for the life of the facility.
Our commissioning process steps include:
- Creating the Owner’s Project Requirements
- Using the OPR to create a Basis of Design Document
- Sending the Basis of Design Document to sub- contractors and designers for bidding and incorporation into the plan sets.
- Verify that systems and assemblies perform according to the Owner’s Project Requirements.