ideas for these pics

I agree Pure L, that would be an ideal way to install something with a caulk-able like consistency, which anyone of the products considered could be mixed to meet. All-n-all, those small areas trying to be filled are doing no harm one way or the other, me? I'd blast right over them, holes and all, with sheetrock and never look back! That's just the way I roll....

that's my whole issue. drywall can't easily be used in these areas. no place to nail to or very irregular shapes... ma' blasting days are over.

Isn't this the area of concern? The little whittled away pieces that create small penetrations on the exterior siding...or is it something that I haven't been clued in on yet? download/file.php?id=28169

So xspace, You would just go over those with drywall? No filler of any kind? I swear Rod gave me similar advice in a thread I posted in once. I think the rationale is "airtight is airtight". Right?

Yes sir, that and mass is mass and those small parts missing up against a wall of mass will not change anything. I agree with the op that it is good to fill voids as much as possible, but these are just killing his fingers and stopping the process of building with no gain that I would consider worth the effort. Still, it's his time.

yes there are other areas not pictured. so many fun and unusual things to find in a room this age. but i think you guys have a point about airtight is airtight. some of these areas should be covered because i have no idea how sealed the wood is. and many are difficult to cover with drywall. when will great stuff make a product called spray mass®?

Yeah, I'm somewhat in the same boat although my room isn't quite as old (about half as much as yours, I'd say). Here are the issues: -many small, odd-shaped areas where wood has been knocked out or is just plain missing -filling all of these would involve a massive amount of "spread" (fixall, etc). -what if that huge area sweats or has some other issue underneath 3 layers of drywall? That would really, really suck.

The sweating part should not be an issue. The moisture will only stop when it encounters a membrane that it cannot pass through, plastic for example.