Yeah, I’ve run into that too. The thing with old wood frames is they just can’t keep up once the air inside gets humid, no matter how many fancy panes...

I hear you on the plexiglass panels—tried them on my 1920s bungalow, and let’s just say “precision fit” wasn’t in the cards. Magnets kept popping loos...

That condensation issue behind the flashing rings a bell—seen it more than once, especially on north-facing walls where things never quite dry out. Me...

I get the appeal of backer rod and silicone, but I’ve actually had better luck with low-expansion foam—at least for drafty old frames where nothing is...