I wanted to insulate the crawl space in our house. I bought Ultra Touch insulation which is made from post-industrial recycled denim from blue jean factories. It is easier to handle than fiberglass and also a "green" product.
Step 1: Materials
The material list is pretty simple. The insulation and supports was enough to cover 1200 sq ft.
23 rolls of R19 insulation
7 boxes of 100 insulation supports
Something to cut with. I had bread knifes, utility blades and bare hands.
light - headlamp, flashlight and work light.
Wire cutters, I used bicycle cable cutter to trim the supports where the bays were not 16" on center.
Step 2: Drag the insulation under the house
The cotton insulation needs to fluff up a bit to go back to its original loft. I cut open and set out rolls to let them expand. The ones that were sitting a while, were stuffed into the crawl space access door. It is best to have one person feed and another to stack them. The access door was small and it took a while to go from under the house to outside. It was easier to have all the materials under the house.
Step 3: Stuff rolls between joists
The rolls are a bit wider than 16" which allows you to stuff them between the floor joists. They will fit pretty well just from friction but the supports are supposed to be 4" from the ends and 16" to 18" apart.
To install the supports just push up them up between the joists. The ends of the supports will dig into the wood and bow upwards into the insulation. Be sure not to compress the insulation too much, this will decrease its R-value.
To see how far apart to put the supports, I just held up a support lengthwise from the previous support since each support is about 16."