We are contemplating adding open cell foam insulation in the exterior walls of our 100 year old farmhouse and closed cell foam insulation on the floor joists in a non-conditioned crawl space area (open to the basement on one end). The company that will be doing the work recommended spraying the interior field stone/rubble wall of the crawlspace with closed cell foam as well. The original wood beams sit directly on the rock foundation, there is no membrane under the beam. Is it okay/advisable to encapsulate the floor joists, fieldstone wall, inner face of the wood beam (sill plate) with closed cell foam? I am concerned that this could potentially cause moisture damage in the future either to the sill plate (wicking up from the stone foundation) or to the rock wall itself (by trapping moisture between the insulation and rock). Any comments would be appreciated. Thank you!