Hello:

I use all the sizes........have tried them all.

What I do is start with a 3" lenght, then go up or down from there, normally in 1" increments.

Home Depot, Ace Hardware, window installation places...

Do a search on "backer rod".......I had a great post on how to make them......

"worse day sport fishing, still better than the best day working"
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"Worse day sport fishing, still better than the best day working"

"I thought growing older, would take longer"