Self-adhesive Under Door Draft Stopper Silicone Door Bottom Seal Strip Door Gap Blocker, 39"

works well. got it for smoke that wafts from across the apartment hallway.tape is very sticky. be ready with clean threshold before removing tape from adhesive strip.

We used to seal the door in the garage. It is good and easy to install. No more spiders crawling underneath:)

oops. did not measure doorsill. assumed it was same size as others inside apt.