Request recommendations for a putty or foam

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If it were me I would tend to use something that will expand and contract with movement.

Foam may not do that well.
 
Whatever gives you max R value!! Saves on heating and AC bill. Also a really good vapor barrier (heavy plastic) helps tremendously.

Treblig
 
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Foam backer and a high quality caulking.
Foam backer comes in rolls of various diameters,cut to length and stuff into crack. Caulk over top.
 
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