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How do you insulate an unheated crawl space?

Instructions Prevent Moisture From Entering the Crawl Space. ... Look at Interior Sources of Moisture. ... Seal All Crawl Space Doors and Vents to the Outside. ... Seal Rim Joists and Sills. ... Insulate the Crawl Space Walls. ... Lay the Vapor Barrier on the Ground. ... Seal the Vapor Barrier to the Wall Insulation.

thespruce.com - How to Insulate a Crawl Space - The Spruce

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Insulation is important for keeping any home warm while controlling energy costs. One of the most important ways to keep your home warm is by insulating cinder block or concrete crawl space walls and sealing the floor. Correct crawl space insulation can prevent your crawl space from becoming a moist environment that grows and harbors mold and mildew. Controlling crawl space temperature and moisture is a dual process that works toward a common goal: a temperate lower area that will keep upper floors warm, while your home's foundation remains in sound condition.

Crawl Space Insulation Basics

The proper way for homeowners to insulate a crawl space is to insulate the walls and lay a vapor barrier on the ground. Spray foam may be used by professionals, but most do-it-yourselfers lack the equipment or experience for working with spray foam. Instead, for do-it-yourselfers, the easiest type of insulation to use is rigid foam on the walls. With a plastic vapor barrier on the floor, the two materials are joined with tape. It is important to seal any gaps or cracks in the walls before installing the insulation to ensure that it is effective. Vapor barrier in crawl spaces is typically a thick plastic sheet that is used to prevent moisture from entering the crawl space and to help control humidity levels. The plastic is a 6 mil or thicker reinforced polyethylene plastic sheeting. Warning Stapling fiberglass batts between joists to the underside of your home's floor may help in the very short term. But moisture eventually builds in the crawl space and grows on this highly porous surface. Moisture-laden fiberglass will sag and fall. Adding fiberglass batts to open floor joists is an outdated method that is not just ineffective but regressive, as well. With crawl space insulation, the idea is to condition the crawl space, much in the same way that you might condition other parts of your home. Rather than trying to cut off the crawl space from the conditioned upper floors, you should bring the crawl space nearer to the upper floor's temperature by leaving off the underfloor insulation, by insulating the walls and sealing the floor against outside moisture and temperatures.

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Reduces moisture

Conserves energy

Increases home maintenance

Reduces air circulation in home

Potential loss of storage space if access is prohibited by insulation

Labor-intensive

Rigid Foam Insulation Basics

Rigid foam insulation is a dense, stiff material made from polystyrene, polyurethane, or polyisocyanurate, and is known for its high insulation value and durability. It is the favored insulation for crawl space inside walls. Rigid foam insulation works for any type of masonry wall: concrete, block, brick, and even stone. One of the main benefits of rigid foam insulation is its high insulation value, which means it is able to provide a high level of thermal resistance with a relatively small thickness. This makes it an efficient choice for many applications, especially in basement walls. Rigid foam insulation is easy to install, as it can be cut to fit around electrical wiring and other obstacles. It is also resistant to moisture, pests, and mold, which makes it a durable choice for many applications. Tip Rigid foam insulation may be faced with silver foil, with the foil facing inward toward the crawl space. Though the rigid foam is the chief insulator, the foil adds a bit more energy savings by reflecting heat into the crawl space.

Crawl Space Ventilation

For this type of insulation system, crawl space ventilation to the exterior is sealed off. All avenues to the outside are shut off or sealed with caulk. An airtight, insulated crawl space will make your house, as a whole, more energy-efficient by keeping your floors warmer in cool months and thus reducing your heating bills. During warm months, this process works in reverse by keeping your floors cooler and reducing the load on your air conditioner.

thespruce.com - How to Insulate a Crawl Space - The Spruce