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Maybe its just my fear of water but is there a problem with caulking behind the nailing flange of a new window prior to installation i.e. expansion?
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We have been for years on all flanges especially across the top flange. We use vulkem or silicone.Latex will also work if you will have a few days dry weather for it to set up ( at least in the rainy season). Caulking is cheep insurance esp for vinyl windows where you are not supposed to nail the top tight.Depending on application we will also use "moist-stop" or a metal flashing across the top.
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Maybe its just my fear of water but is there a problem with caulking behind the nailing flange of a new window prior to installation i.e. expansion?