Q: Im curious about how best to install this foam board insul

The ext panels r dry rotted so demo and replacing. along with insul which is either shot or nonexistant because the heat on the wall inside is bado since no shade is there i want to give an r rating boost the foam should work but i understand its usually put on before drywall but im not demoing drywall so will pieces ripped wider than the stud space work as good as to be hoped for or should i cut to fit a throw sone sealant on the srams or no sealer and exact fit or is thete no real differance

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