I'm talking about the typical situation where a wood door starting to stick= in humid weather. I plane the door so that it no longer sticks in the jam= b, and then everything is fine until a year later when it gets humid again = and the door has expanded yet again and sticks. =20
I'm a woodworker, and fully aware of the effects of humidity expansion and = contraction. I have an end-grain stick cut from the end of a tabletop I bu= ilt that I measure it's length and use as a gauge to know where in the expa= nsion and contraction cycle the environment is currently in. I always seal= all 6 sides of the door in question to limit the magnitude of the expansio= n and contraction due to humidity.
The thing that I can't figure out is why do wood doors always only grow lar= ger over time? I have numerous doors that I plane to fit very nicely, and = then several years later I need to plane again because they have expanded l= arger. Never in my life have I ever seen a door that shrinks due to low hu= midity and causes an excessively large gap. I see this on both interior an= d exterior wood doors.
So what is it about the expansion/contraction cycle that appears to be bias= ed toward expansion?
Ken