Foam One-One

Existing Homes

Crawl Space/Basement Solutions

Foam One-One Crawlspace Remediation


If your house or structure was not built on a slab foundation, you likely have what’s known as a crawlspace under your house.  Vented or unvented, a crawlspace can affect indoor air-quality, occupant comfort, and energy efficiency.  Any leaky floor built over a crawlspace will encounter what’s referred to as the stack effect where cooler air replaces warmer air as it rises upward and often outbound of the house.  Without air-sealing, the stack effect draws musty, humid air from the crawlspace to the living area negatively influencing indoor air-quality and energy efficiency.  Results of this effect include a drafty house with cold floors in the winter and year-round potential for unpleasant odors rising through the floor.  However, 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 protection and thermal insulation.  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.    


Existing - Crawl Space - Image 2