TR3: Concrete Design Mix

Service Description

Beginning October 1 2009, DOB only accept the new version TR3 Prior to permit on all jobs in which concrete will be used, the Department requires a Concrete Design Mix Technical Report. A Department-licensed Concrete Testing Lab must submit the TR3, and the lab must attach the trial mixture reports and/or the field experiment results. The new TR3 includes the following additional required sections: • Design Applicant’s statement and signature; • Building Owner’s statement and signature; and • Concrete Producer’s statement and signature. This Technical Report must be filed prior to permit issuance in accordance with requirements of the New York City Building Code Chapter 19— Concrete. Trial mixture reports and/or field experiment results must be attached when submitting the TR3. As a reminder, additional TR3 reports should be submitted as needed for additional trial mixes.