Re: Sealing threshold to concrete on garage entry doors
I'd toss silicone in the garbage where it belongs and go with a beutyl or elastomeric caulk, as these will have better adhesion, and if the time arises that the doors need to be replaced, you can reseal with more of the same, unlike silicone that won't stick to anything, including itself.
Once installed, don't forget to squirt a little low-expansion foam insulation between the jamb and framing to seal up air leak/heat loss. Use it sparingly, as even the low expansion foam can distort door jambs enough to cause binding. Read the label and know what to expect in expansion so that you can lay the proper sized bead of foam.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!