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Unread 10-01-2019, 09:13 AM   #10
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Join Date: May 2017
Location: Milwaukee WI area
Posts: 1,061
a very valid concern. I dont like that gap either in a freezing climate. I would fill it with a closed cell foam backer rod and SOME kind of elastomeric filling. Probably Sika flex.

Can you show a better picture backed up a bit? I can't tell where exactly it is.

I would wait to see what a pro says though. I am not a pro....
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