Technical Inquiry – Powder-Actuated Fastener Anchorage to Concrete on Metal Deck

We are working on a project that involves installing interior cold-formed steel (CFS) partition walls on an elevated floor system consisting of a concrete slab on metal deck supported by open-web steel joists.

The existing floor assembly consists of 1-1/2" Type B metal decking with a 1-1/2" concrete topping above the deck. Due to the limited concrete thickness, we are evaluating the use of Hilti X-U powder-actuated fasteners (PAFs) to anchor the CFS bottom track to the slab.

Based on our review of ESR-2269, the minimum concrete thickness must be at least three times the fastener embedment depth. For a 3/4" embedment, this would require a minimum concrete thickness of 2-1/4". We believe this requirement could be accommodated by specifying that the fasteners be installed within the lower flutes of the metal deck, where the available concrete depth is greater.

However, we would like to confirm whether there are any additional limitations or installation considerations associated with this approach, particularly:
Flute edge proximity: Are there minimum edge distance requirements relative to the sides of the deck flutes or transitions between the high and low portions of the deck profile?
Installation requirements: Are there any specific recommendations regarding fastener selection, installation power, or field testing for this type of floor assembly?

Ultimately, we would like to determine whether the X-U fasteners are suitable for anchoring the CFS bottom tracks in this application and whether any additional detailing or installation restrictions should be incorporated into the construction documents.

I'd appreciate any recommendations or technical guidance you can provide, including any applicable Hilti documentation or testing that addresses this condition.

Thank you,