Crawl Space Insulation for an Encapsulated Crawl Space

Properly installed crawl space insulation slows the transfer of heat through the floor and walls below your home, which helps your home hold a more even temperature and can ease the load on your heating and cooling system. Many homeowners notice warmer floors in winter and steadier comfort in summer once the space is sealed and insulated. We do not promise a specific dollar figure, because savings depend on your home, your existing insulation, the moisture conditions, and how the rest of the house is built. What we focus on is sealing the crawl space and installing insulation correctly, so it actually keeps working and keeps reducing the energy lost through the floor.

See crawl space encapsulation price ranges by service

In most cases the cause is moisture, and the insulation fails as a result. Across the Piedmont, the coast, and the SC Upstate, humid air drawn into a vented crawl space meets cooler surfaces below the floor and condenses. Fiberglass batts soak up that moisture, lose their insulating value, grow heavy, and eventually sag and fall to the ground. That is why insulation belongs in an encapsulation plan. Once the space is sealed and the moisture is controlled, new insulation goes back into a dry environment, so it lasts.

It depends on the home. In many Carolina crawl spaces, encapsulation is the difference between insulation that lasts and insulation that fails again. If your crawl space stays damp, new insulation will eventually suffer the same fate as the old. Sometimes addressing the vapor barrier and moisture sources is enough to support floor insulation in a vented space. In wetter conditions, common around the coast and in heavy Piedmont clay, sealing and encapsulating the space first is what protects the new insulation and lets it steady the temperature below your floors. We assess your specific conditions and recommend accordingly. Encapsulation with a dehumidifier air seals the crawl space and helps right away, even when the old insulation is not replaced. Building code still requires insulation, so HydroHelp911 insulates even when the space is encapsulated.

We do not recommend it. Insulation that is wet, compressed, sagging, or has dropped to the ground is no longer doing its job, and leaving it in place means building over an existing problem. We remove failed insulation and prepare the crawl space so the new material starts from a clean, dry, sealed condition. That is part of why insulation is usually one part of a larger fix in the Carolina climate, and why we look at the whole crawl space before installing anything new.

The price for your home depends on the size of the crawl space, the type of insulation, whether old insulation needs removing, and whether it goes in as part of sealing and encapsulating the space. You receive a written estimate after a free inspection.