Styrofoam Insulation-What About Vapor Barrier

[dragthepaint]

Is it ok to use the fan fold insulation that it used on houses to insulate my shasta. I read on here that it can be cut and glued into place between studs but doesnt that defeat the purpose of the "vapor barrier" to keep condesation off the wood? Im just wondering before I spend an afternoon cutting and gluing this stuff in....If in deed it will be worthless or not as far as protection of the wood? Any Insulation Experts Out there???

[hamiltonbuilt]

vapor barrier? Thats a good idea. Something like tyvek house wrap. it would seal off all the corners. windows would still be an issue. I may use it on mine.