DIY crawl space encapsulation improves indoor air quality, energy efficiency, and moisture control. It involves installing a polyethylene vapor barrier, drainage matting, and insulation to create a sealed and protected environment. Essential tools include measuring tape, utility knife, staple gun, and caulk gun. Contractors and associations provide expertise and resources for encapsulation, while reputable brands offer specialized products and systems. Homeowners can access DIY guides and resources for a successful installation.