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Thanks, if I end up with any exposed foam I'll try that. I'm trying to use sheet metal, hardware cloth and some caulking. Hopefully I don't have to use any foam.

After snooping around up there and taking down some of the old nests, I've decided to take off the existing flashing so I can get to this properly. I'm going to make some aluminum flashing that will serve to block the blowing rain and block access for the birds. If they can get through sheet...

That's a thought, I could make a tube out of hardware cloth and shove it in the space, then spray the foam in the hardware cloth.

3M has a product like that, I went to their website and it said it wouldn't work on birds. Hard to believe it will stop rodents but not a bird, maybe it's got some kind of chemical in it that birds ignore.

I've got a spot where rain blows in along a lean to roof on my barn that I've tried closing with expanding foam, but the birds like that spot and/or the foam because they keep pecking it away. Is there any kind of foam that hardens enough that birds can't peck it? It's a prorib style roof and...