The appropriate choice of fasteners in this applications would be a fine threaded drywall screw. Said fastener should be a minimum of 1", but I would prefer to use 1-1/4"
If said structure was wood, then the screw of choice shall be a course threaded screw.

 

Grabber makes a hardibacker screw with a self drive tip which I would wager would work on the Durock, will definately work on the steel stud and has a large enough head to hold the Durock secure as opposed to a drywall screw which I found has a tendancy to go through the board or the heads snap.

 

They will "tap" themselves in to the studs. DO NOT OVER DRILL/DRIVE.

 

I sir do concur. The over torquing of any fastener will cause the fastener to spin in the intended receiver of the fastener causing the fastener to remove too much material from around the spiral windings causing a loss of adhesion to said member. Thusly the fastener shall need be removed and re inserted in another area.

 

Aren't you missing a Lifetime Movie?

 

seen em all!

 

LOL intended for Malco.

 

Who?

 

The only problem with all of the above screw recommendations is that the metal studs aren't heavy enough to hang onto a screw and set the screw head at the same time. Metal studs to which cement board is to be applied should be 20 gauge or greater.:whistling Twenty-five gauge will be a problem.

The lighter studs can also allow the walls to flutter.

 

Not even something I considered....Nor knew......:whistlingThanks for the edumication.:thumbsup:

 

ITW Rock-On screws

http://www.itwbuildex.com/catpdf1/rockon-backeron.pdf

http://www.itwbuildex.com/rockon.htm

 

Yup! I walked away from an airport job one time because the GC insisted his crew could install the cement board on the walls over metal studs. When we arrived to install the tile all of the screws were standing proud. Thousands of those suckers. Most of them were loose and rattled.

The contractor tried to slip-in 28 gauge studs when the plans clearly called for 18 gauge. Then the day-labor guys that installed the CBU just plain didn't know, didn't rocognize the issue, and didn't give a damn that all the screws were standing tall.

Man.......everybody was totally pissed at me when I refused to do the job. The GC threw a fit, the retailer I was working for threw a fit, the airport authority threw a fit. The bathrooms had to be redone totally and when it came time to actually do the tile the GC told the retailer he never wanted me on another one of his jobs. I just caused too much trouble. So I wasn't sent back to do the job the second time around.

 

People REALLY hate getting caught with their pants down!!!!!!

Regardless.......Not the sort of fool you wanted to work with anyway!!!!