Yes. In your crawl space, a vapor barrier is required. Furthermore, a moisture barrier is the bare minimum of protection for your crawl space. A vapor barrier might save you money on costly repairs.

The preferred insulation for crawl space inside walls is two-inch expanded polystyrene foam board.

R30 is one of the standard R-values for insulation, which is a measurement of a material’s resistance to heat conduction. If heat conduction is reduced by 97 percent, insulation is rated R30.

It is possible to over-insulate your home to the point where it can no longer breathe. The purpose of home insulation is to keep your home’s inside tightly sealed. However, if it is overly sealed with too many layers of insulation, moisture can become trapped between them. Fungi starts to grow at this point.

The short answer is that IF you want to make your home more energy efficient, you should insulate your crawl space. … The Department of Energy recommended that your crawl space be adequately insulated.

R-15/19 is how the code provides insulation needs based on location. On the interior or outside of the perimeter wall, R-15 continuous insulation (board insulation) is required, or R-19 cavity insulation is required on the inside wall.

A higher R rating on your insulation usually signifies better climate management and energy efficiency for your home. A higher insulation R-value usually translates to a higher price tag. Check the manufacturer’s R-value per inch of thickness for each kind and material of insulation.

R-13 to R-23 is a frequent suggestion for external walls, whereas R-30, R-38, and R-49 is a popular recommendation for ceilings and attic areas.

In warm climates, R-803-310-6330″) insulation under floors is recommended, whereas in cold climates, R-25 (6″ to 8″) insulation is recommended. Install the insulation between the joists with the paper vapor barrier facing up toward the heated living space.

Rigid foam insulation board is the ideal insulation material for crawl spaces. The foam board is put against the crawl space foundation walls, rather than between the floor joists in the crawl space.

Insulate the floors above chilly regions, such as vented crawl spaces and unheated garages, but don’t forget to insulate beneath the flooring. This will ensure that your home is as energy efficient as possible. Slab floors, which are laid directly on the ground, are perfect for insulation.

If you have moisture in your crawl space, the fiberglass insulation will absorb it and hold it against your sub-flooring and floor joists like a sponge. … Fungi can grow not just on the wood, but also in and on the insulation.

It’s critical to seal insulation and cover it with a vapor barrier to avoid moisture and fungi, which are often following behind. If your crawl space isn’t ventilated, insulate the crawl space’s walls rather than the room’s subfloor.