What’s your favorite/best outside door insulation/sealer?

[davester]

What you are referring to is called weatherstripping. Insulation is a completely different animal. The best, longest-lasting door weatherstripping is the spring bronze kind:

https://thecraftsmanblog.com/wp-content/...ipping.jpg

A plastic easy to install version is available (M-D V-Flex) but doesn't last near as long:


Door bottom weatherstripping is highly dependent on the application.