I'm looking into build bat houses and water proofing the enclosure is a large part of most tutorials. Almost all suggest that you need to caulk all the seams.

None however are very specific on the type of caulk. To be clear I am not looking for brand recommendations as those would be clearly off topic. I am however looking for suggestions of the best type of caulk. Obviously I would not want to be using bathroom caulk outdoors. Last I checked there were oodles of choices.

I live in southern Canada so temperature would be a factor.

  • Aside from finishing issues that may come up, the DIY/Home Improvement stack exchange might be better suited to questions about caulk selection. diy.stackexchange.com.
    – rob
    Mar 18, 2015 at 4:44
  • @rob I already tried questions like this. They were closed as off-topic
    – Matt
    Mar 18, 2015 at 10:48
  • That stinks. Well I hope you're able to find an answer somewhere. Otherwise I suppose any outdoor-rated or "doors & windows" caulk should work.
    – rob
    Mar 18, 2015 at 15:01

1 Answer 1


I would suggest using something like a pine resin rather than caulk. Keep it as natural as possible. Also, please don't forget to reinforce the entrance to hinder squirrels from chewing through. They will eat baby birds.

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