Access the crawl space under the floor and clean out debris and old insulation.
Measure the crawl space to determine the amount of insulation required. Measure from end to end and side to side, and note the measurements.
Buy insulation blankets or batts at a local retail establishment or online. Blankets or batts is the insulation industry term for long and wide strips of rolled insulation. The insulation "R" value determines the level of protection from hot or cold required in a specific geographical location. Ask the insulation dealer to look up the correct "R" value for your area.
Repair water and moisture problems in the crawl space such as leaking pipes, wall cracks or water seepage. Moisture problems lead to mold or mildew growth and wood rot which threatens the structural integrity of a home.
Place the insulation blanket between the floor joists, commonly referred to as beams. following the lines of the joists.
Cut the insulation with a utility knife to fit the area lengthwise.
Hold the insulation in place, pressing it firmly to the crawl space ceiling. Use a piece of wood as wedge to keep the insulation from falling down.
Measure and cut wire mesh to fit the length and width of the floor joists.
Place the wire mesh over the insulation, extending it to the middle of the floor joists.
Staple the wire mesh to the floor joists with a commercial grade stapler.
Repeat this process throughout the crawl space covering all exposed ceiling areas.