Caulking for sealing joints in cedar fence

[Greg Magone]

I think you are wasting your time and may create a bigger problem. Cedar is porous and absorbs water readily. If you seal the joints where the spports are any moisture that gets in through the wood or the sides will pretty much stay there and the caulking will help seal it in instead of letting the wood dry out

Good point. You are 100% correct that the caulk will just seal in moisture that is absorbed elsewhere and will lead to rot that we wouldn't have otherwise.

[Erik Loza]

Cedar is "the" fence material here in Central TX and the climate is largely warm and humid. I agree with the others: Be too afraid of locking moisture in by using sealant. The one exception is sealing the endgrain, since that is like a wick and sends the moisture straight through to ground level, where it will rot the post out at the base. But I would physically cap the post it in that situation. Can you post a pic of what you are trying to seal?

Erik

[Günter VögelBerg]

I am not quite sure I understand the use case, but it sounds like what you might actually want is chinking.