There's some kind of orange yellowish looking substance that forms into tiny bubbles (it looks sticky, but I haven't touched it). It seems to be on my floor joists and wall studs. The house is from the 1960s. Is this something to worry about? Termites?
You are looking at tree sap. It's harmless. It's dried out so if it's gonna cause you to lose sleep at night, just scrape it off with a chisel.
That is tree sap. My Grandfather would call it Pitch. Pitch will clean very nicely with kerosene or a naptha product such as coleman fuel. It looks like it is dried out and it should not hurt anything unless you are trying to paint over it.
