Waterproof Doors – How to Seal the Bottom of a Door to be Waterproof

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I'm going to be replacing this front door with a new prehung exterior steel frame door (pic available upon request).

Door in question

This door leads to a concrete porch and water tends to flow towards the door. The door leaks around the bottom, and water drains into the basement area below the door. This has caused 3 joists to completely rot through (already replaced) and when I replace the door I want to prevent this from happening again – at least as much as possible.

This is the bottom of the door from the inside
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and outside
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with closeups (L to R)
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I have pictures of the basement area as well but I doubt those are useful. I was thinking of replacing the wood and simply generously applying a LOT of sealant caulk (maybe something like used for sealing between concrete and patios rather than just plain silicon)… but I'm not sure.

Recommendations?

Best Answer

"water tends to flow towards the door" is your problem. The right way to fix this is to redo the exterior so water will flow away from the house. Sealing the gap would be a good secondary action, but if you leave it at that, you'll constantly be dealing with leaks.

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