Planing is better than sanding. How much has to be taken off? You also want to be sure the door is sealed from moisture as much as possible to prevent big changes in size as the humidity fluctuates. I'd plane the door down enough to put a self sealing weather strip that allows for the slight size variation.
Find out where the water comes from and divert it away from the door. It is obvious you have an architectural design problem since any competent designer can produce plans that make such mistakes nearly impossible. Your doorway might need a small portico or similar building element that would both add to the curb appeal of the house and eliminate the problem. Fiddling with the poor door and hoping for future dry weather won't solve the problem long term.
Find out where the water comes from and divert it away from the door. It is obvious you have an architectural design problem since any competent designer can produce plans that make such mistakes nearly impossible. Your doorway might need a small portico or similar building element that would both add to the curb appeal of the house and eliminate the problem. Fiddling with the poor door and hoping for future dry weather won't solve the problem long term.
The water comes from the air. The cause of the problem is that the installer did not seal the end grain of the door which is allowing the wood to soak in the moisture.
For now plane the door just enough to restore function, and when it dries out when we get warmer weather then remove the door and apply some paint to the top and bottom of the door.
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