Humidity can cause problems with expanding and contracting timber. Timber is always moving with the different weather conditions. I have seen parquet flooring in school hall floors pop up from the sub base due to humidity. In time, the door will contract to the original size when put on. As a quick fix I would sugest that taking small slithers of timber off the door using a sharp plane. Not too much so as to produce a large gap when it finally does go back to the original size.
Hope this helps.
general humidity, most of which is not caused by leaks or the weather but what goes on inside the house - showers, baths, (which is why bathroom doors should always be hung with three hinges, not two - to help prevent warping) boiling kettles and drying wet clothes on the radiators all fill the house with moisture but most of us don't give it a second thought. opening windows will help, even on a rainy day the air in your house is likely to be more humid than that outside.
if you do plane, don't take too much off - the doors can shrink again leaving a big gap at the bottom.
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