I’ve watched a number of videos and read articles regarding conditioning the crawl space.  One question that came up, do you insulate the walls first then apply the vapor barrier or should the vapor barrier be attached to the wall first and then insulation added over the surface of the poly?

IF one does close up the crawls space (encapsulate) is some sort of ventilation still required (like a low cfm fan) to help pull conditioned air from the house above?  I read 5 cfm/certain square footage of space for the fan.  What sort of venting would be required in the floor of the conditioned space?  Same as the fan?  More?  BTW — My location is in the Inland Pacific NW (Spokane WA area) if that helps.

Thanks. 

I read J Lstiburek’s stuff as well as watching a video from NDSU Extension engineer.  Yikes.