We had our house leveled recently and this created some cracks and gaps in the limestone block siding. I can tuckpoint most of it but there are a couple of pretty substantial gaps along that opened up between this window and the jamb. Obviously, I want want to fill these but am a bit unsure about how to proceed. If I stuck some backer rod in there, it would just fall freely into the cavity between the siding and framing (original 1930's construction). There's not really anything inside that cavity for me to mortar against. Fill it with spray foam, then mortar over? Open to suggestions. Thanks,

Erik

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