I use "saw wax" cutting lubricant which looks like a big chap stick and
can be pushed out of the tube from one end. I keep a stick in the
toolbox to lube all sorts of cutting tools, drills, self tapping screws
and even drawer slides and sliding windows. You can find it or a similar
product wherever cutting tools and drills bits are sold. ^_^
I've seen those wax sticks, but never quite connected
in my mind. Sadly, as a Mormon, I've been smoking, off
the side of a circle saw blade. So, the saw wax may get
multiple uses, after I finish power screwing.
Tapcons (brand of concrete screw) come in blue or black AFAIK. IMO, either
is going to look crummy in a threshold; not only becuse of the color but
because the head will stick up slightly unless you are able to perfectly
countersink them, not always an easy task on thin aluminum.
Let me ask you, how was the threshold originally attached? I'd try to do it
the same way. One way that is common is to lay down a piece of PT, tapcon
it in and attach the threshold to it with smaller wood screws.
I've had pretty good luck on a few just blasting them full of low
expansion (window and door mounting) urethane spray foam. It sticks
like snot to anything and keeps the threshold from depressing/bouncing
as a bonus.. If mounting a new aluminum threshold to concrete, just
get urethane windsheild mounting compound and lay 2 beads on the
(clean and dry) concrete, and drop the threshold in place. It is there
"for the count".
I installed a lot of thresholds when I worked on automatic and
commercial door systems. I used the blue plastic anchors because sooner
or later some Goomba would come along and damage the threshold which
required replacement. The plastic anchors could be dug out easily which
is not the case with those that are glued in. If the screw in the
plastic anchor was stuck, a flat bar can be hammered under the threshold
to pry it up. Think forward. ^_^
The foam stuff sounded like a thing to try, if this
doesn't do. Plenty more cement under the six inch by
double 36 threshhold, if I have to put in more
anchors. If these snap off, or some thing.
Hoping not many goombas, here.
I'm write from experience and know very well what works. I installed
automatic doors in hospitals, grocery stores and any place which used
automatic doors. I had to service and repair not only the automatic
doors but manual hollow aluminum and steel doors in commercial settings.
I did it as an employee of an automatic door company and later as an
independent contractor for a door company and directly for a grocery
store chain. I actually traveled across Georgia, Alabama, Mississippi
and Louisiana on service and installation jobs. I repaired and replaced
a great many thresholds which often required using a thin layer of quick
setting concrete and an angle grinder to level out the surface where the
threshold was to be installed. Stainless steel screws worked the best
with the plastic anchors which made service and repair a lot easier but
some idiot would always use regular screws which always corroded and
stuck requiring me to use the flat pry bar and hammer to remove the old
Yep, them goombas are every where. Sounds like great
wisdom. I'm glad you cheated the grim reaper (for
now) and still around to share your wisdom. How does
Saint Peter secure the threshold for the Pearly Gates?
I find blowing through a fairly long straw the best way to clean dust out of a drilled hole in concrete. Just be prepared to protect your eyes as the dust really circulates everywhere if you blow vigorously enough to really clear the dust out of the hole.
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