I haven't read all of the other replies yet, so maybe someone already
But, have you considered just gluing the threshold down using this?:
I don't know about the cold temperature part, but I have used Loctite
PowerGrab to glue down thresholds to concrete and it worked well.
I have also used Tapcons a couple of times to try to attach things to
concrete, not including thresholds, but including securing interior 2x4
walls to a concrete floor with pre-drilled holes in the concrete. One thing
that I found was that if I got a little too hasty using a screw gun to put
them in, they "over-drilled"(?) and the Tapcons just destroyed the concrete
like a drill and they wouldn't hold. So, I partially screwed them in with a
screw gun and then hand-tightened the final part. And, even with Tapcons,
maybe a little glue in the pre-drilled holes (such as the Loctite stuff)
would help secure the Tapcons in place.
A threshold is a strip across the bottom of a door opening that seals it wh
en the door is closed, so cold (or hot) air does not seep in under the door
. A threshold can be wood, metal or vinyl, but a popular option is aluminum
, which is resistant to rot or water damage, cleans easily and requires no
regular maintenance. Many aluminum thresholds have rubber strips that flex
when the door is closed to provide a tighter seal. Replacing a threshold wi
th a new aluminum one is fairly simple.Measure the bottom of the doorway wi
th a tape measure and buy an aluminum threshold to fit; most entry doors ar
e about 36 inches wide. Match height of the new threshold to the old; make
sure the new threshold is no higher off the floor to avoid door closing pro
blems. Use a rubber-centered threshold if the old one had such a piece. For
more information http://www.buyliquidroof.com/liquid-coatings.html
The most durable seal especially for commercial doors where there is a
lot of traffic, is a solid flat threshold and the seal on the bottom of
the door. A brush strip seal on both sides works very well. ^_^
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