Vulcraft Composite Deck Allowable Superimposed Loads

[CN-EIT]

Just putting out some feelers if anyone could provide an explanation for a discrepancy I am seeing in the new vulcraft steel deck guide (online pdf) vs an older 2008 hard copy we have in the office. Its pretty common throughout the decks but a specific example would be looking at a 2VLI20 Composite Deck w/ 2" normal weight top (4" total thickness) spanning 10'-0". Published superimposed allowable loads for this configuration follow:
1) 2008 Vulcraft Steel Roof & Floor Deck Hard Copy Manual: 96psf
2) Latest web based edition of the aforementioned literature: 190psf
3) ESR-1227 subject to renewal December 2020: 142psf

I reached out to Vulcraft and was told to use their online deck calculation tool. They also mentioned that it has to do with the current SDI & AISI standards as well as their "coil/deck properties". Comparing the 2008 literature to the most recent, the deck properties remained relatively constant with the only notable change being a lower section modulus for the steel deck itself in the most recent literature compared to the 2008. Anyone have any insights here?

 

[slickdeals]

I had reached out to Vulcraft in the past about the discrepancy. I am pasting their feedback below.

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The documents are based on completely different methodology. The values in our catalog are based on historic testing and follow the shear bond method. The values in ESR-1227 follow 2009 IBC. The values from our design tools follow the current building code, SDI C-2017 and 2018 IBC. We are well aware that the documents produce different answers and we plan on fixing this issue in the next version of our catalogs (which are to be released in the very near future). For the time being, please use the values from the design tools as they are following the most recent building code. In addition to the methodology, due to the limitations on printed tables, we must make certain assumptions which are typically listed at the bottom of the tables. These assumptions do not apply to our design tools as you have the ability to input these values for your design.
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