I have a question on securing conduit to metal Q decking used in commercial buildings. I usually use self tapping sheet metal screws. The last job we were on concrete was poured on top of the Q decking. What type of screw do you use that first has to go through metal then through concrete. Thanks for any help.

I've been a pretty big fan of the Tapcon system

[url to follow]

It's easy, quick, and the carbide tip should be able to punch through the decking to anchor in the 'crete above.

I've been a pretty big fan of the Tapcon system
http://www.itwbuildex.com/tapcon.htm

It's easy, quick, and the carbide tip should be able to punch through the decking to anchor in the 'crete above.

Thanks Doug for the help, that looks like the masonary screws I'm going to buy.

I use a Hilti and just drill thru the decking then use the proper anchor for the job, plastic or steel a drop in

I bang the corner of the flute with a hammer
which loosens up the concrete an a sef tapping screw will go right in.