New answers tagged door-frame
Even when swept clean I would not consider that a properly prepared surface for a threshold. Just the nature of the uneven surface of those filled concrete blocks would make water tend to collect underneath. You should use a concrete patch/resurfacer to create a smooth level (or slightly sloped away from the opening) surface, then attach the threshold per ...
Shim out the hinges and then add weatherstripping to the hinge side.
Sometimes the problem is a misaligned strike, especially if thick weatherstripping was added since the door was installed but it can happen for other reasons. I've patched that on multiple doorframes...
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