Crawlspaces retrofitted with spray foam often yield multi-faceted benefits for the homeowner. Effectively managing moisture and air leakage with a vented crawlspace includes spraying the underside of the floor between the joists with vapor-retardant closed-cell foam. Unvented crawlspace design includes polyethylene sheets laid over any bare ground and glued in place along the base of the crawlspace walls with closed-cell foam. More foam is spray applied around the entire perimeter crawlspace wall to ensure a complete air and vapor control system as well as great insulation. The unvented crawlspace design is an effective way to achieve a semi-conditioned area where duct work, HVAC, or other appliances benefit in terms of usage and longevity from the moisture and thermal advantages. Without properly managing moisture levels in a crawlspace there is a high risk for mold and mildew, wood rot, buckling wood floors, and condensation build-up on duct work or HVAC equipment. Let Foam-One-One check out your crawlspace to see if spray foam is the right fit to remedy your under-floor energy and moisture issues.