Quote Originally Posted by shine View Post
yes it does. foam-it-green is a closed cell foam but it still holds water. or they say it is . i'm no foam expert. i do have friends with foamed shops that have had problems. my shop is done with water bags but it is 20 years old and so far so good. i can see where it has leaked but no rust through or problems yet. if i had it to do over i would have a wooden shop . metal building roofs suck. they sweat and rain or they pull screws loose and leak .
i was skeptical of flexseal but after using it i know it works. i rolled it over the seam of the add on and it has lasted 2 years. going up before winter and doing another coat.
That in bold is why most of the tin rusts out when the spray on insulation is applied. Supposedly builders around here are saying to lay the foil wrapped thin foam board down first, then put your tin on, then spray the insulation on. I know I wish I would have at least put plastic done before I put my tin on the south side of my building. It will rain in there when you heat it in the winter.