I have a very low crawlspace that i finally have access to while the floors have been removed. The crawlspace is vented freely and Former owner attached unfaced polystyrene boards to the perimeter concrete foundation with just fastners. I'm going to encapsulate the crawlspace to seal against vermin, radon, and provide some extra amount of insulation. Humidity and water isn't a worry as we are in Albuquerque.
Are there any problems with running the vapor barrier over the insulation and attach/seal thru/against the foam board and or should i remove the foam board?
I'd rather add additional spray foam or something around the foam board gaps than remove it. I planned to get some extra long fastners so i would drill thru the foam and into the concrete and attach the vapor barrier with those.
I'll also be putting in an active submembrane radon system and a Humidity activated vent fan rather than a dehumidifier because wow those are expensive.