What is the correct way to install insulation batts in a crawl space?

The appropriate method for installing insulation batts in a crawl space is to position the paper facing towards the subfloor. This is because the paper facing serves as a vapor barrier, which is essential in preventing moisture from entering the insulation. By directing the paper towards the warmth of the living space, it helps keep humidity from seeping into the insulation, thereby reducing the risk of mold growth and ensuring the insulation remains effective.

In a crawl space, proper moisture management is crucial. If insulation is installed with the paper facing away from the subfloor, it could allow moist air from the crawl space to come into contact with the insulation, negating its insulating properties and potentially leading to long-term damage. The other options provided do not promote the same level of moisture control as positioning the paper facing the subfloor, which is why they do not align with best practices in crawl space insulation installation.