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Found I have some yellow jackets trying to get behind my siding in the j-channel/post at the end of the siding. Can I caulk up and down the entire length of the channel where the siding ends to close that gap off?

Not my picture but I would caulk along green. Yellow jackets trying to get into a gap similar to red.

enter image description here

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    It was my understanding that the siding needs to be free to move and breathe, but I'm not totally sure. Can you use an insecticide or repellant in that crack instead? – JPhi1618 Jul 12 at 14:49
  • @JPhi1618 is correct, just hand a couple of fake nests or inflated paper bags and that will keep the territorial monsters away. – J Crosby Jul 12 at 15:52
  • Yea I hit the whole seam with Tempo and they have been dissuaded for the time being. Wanted a more permanent approach. – TEEKAY Jul 12 at 16:39
  • You've asked an XY problem. Instead of asking whether a proposed solution would work, ask for a good solution to the actual problem. – isherwood Jul 12 at 19:08
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That's not a good idea. Vinyl siding expands and contracts quite a bit with temperature. By caulking it you prevent movement and could cause buckling or other warping. It would also look bad.

The insects would just find a new location and you'd end up doing it all over again. A better approach is to use aromatic deterrents. More on that

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