Another thing that helps is when you are drilling the hole, run the
drill up and down a few times to ream out the hole a bit. Tapcons
have always worked fine for me--I've tossed a powder actuated gun in
the dumpster in a fit of rage before, so they sure aren't a panacea--
jams, spalling, underdriven fasteners are all problems. (unless you
spend the money and get a Hilti). For instances where you are
primarily concerned about shear, I like drive in pegs or rawls for
ease of use and low tech simplicity.. Using a manual screwdriver on a
tapcon sounds like a hard way to serve the Lord.
Are you sure you're using the right size bit to make the holes? If you've
(a) used the right size drill bit and (b) drilled the hole deep enough,
there shouldn't be any problem, in my experience. I do rub the threads
across a bar of paraffin before installing them, (as I do with almost any
concrete or wood screw) but I usually just put Tapcons in by hand using a
nut driver or by using a socket on my cordless drill.
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