[header] How to encapsulate your crawlspace [title] Provide lighting throughout your crawlspace. [step] Natural light is best, and many crawlspaces have vents that can be opened or removed to let light in. Alternatively, you can place several crawlspace lights, battery-powered lanterns, or other light sources under your home so you'll have plenty of light when you start your work. 
[substeps] Without light, you won't be able to properly fit a vapor barrier and do other work you'll need to complete. [title] Remove old vapor barriers or foundation insulation.