Miami-Dade County - Building Code Compliance Office

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FAQ's Anchors

How many anchors can you use for approval of a product?
How do you get additional anchors added to an existing Product Approved product?
What is the process for obtaining the component approval for anchors?
What is the procedure for anchor spacing calculations on submittals when compared to the units tested?
What is the procedure for comparative analysis on fasteners/anchors?
Can comparative analysis be performed to qualify larger fastener/anchor spacing for loads other than tested?

How many anchors can you use for approval of a product?

Anchors are qualified based on mounting condition into substrate tested and verified by calculations. Anchor manufacture may apply for component approval of the brand and type anchor tested.

How do you get additional anchors added to an existing Product Approved product?

You must submit for a revision of your product to include the additional anchoring devices.

What is the process for obtaining the component approval for anchors?

Testing per ACI 355-2-07 is required. See anchor checklist

What is the procedure for anchor spacing calculations on submittals when compared to the units tested?

The allowable load, based on the fastener's/anchor's safety factor, shall not be exceeded. This is the reason for requiring anchor calculations for most products. These calculations are not to be misinterpreted with rational analysis on anchors. The calculations are as verification to assure that the load tested has not transferred a load to an anchor that exceeds its rated value.

What is the procedure for comparative analysis on fasteners/anchors?

The only comparative analysis allowed on fasteners/anchors is when the specimen is tested on CBS block. Since this substrate has been determined to be the worst case application, comparative analysis is allowed to qualify approved anchors on concrete, metal, and wood.

Second, the fasteners/anchors submitted with comparative analysis shall not exceed the spacing at which the system was tested. This is due to the system's performance with the amount of fastening points on the original test. Spacing the fastening points further apart shall be verified with a test.

Third, this procedure applies to products that are impact resistant, and non-impact resistant.

Can comparative analysis be performed to qualify larger fastener/anchor spacing for loads other than tested?

No, as per section 1714.5.4 and 1717.5.2.2 (5) and 2411.3.2.5 (5) fastener and anchor submitted with comparative analysis shall not exceed the spacing or the concentrated load at which the system was tested. This is due to system's performance with the amount of fastening point on the original test.