I'll be using kraft-faced R13 insulation in most of my walls, and R19 on the two walls where it will fit. I'm using 8 foot batts instead of rolled insulation because it seems to be easier to work with.
Rather than cutting a long piece off of a big roll, you just staple each batt into place. Since most basement walls will be about 7 ½ feet, you can cut the bottom 6" and stuff it into the joist at the top of the wall. With many of the pieces, I simply rolled it under at the bottom plate and let it rest behind the framed wall.

I started with the easier pieces first- the full width studs without any obstructions such as wiring, outlets, pipes, etc. I unfolded each batt starting at the top, and stuffed it between the joists. Using a staple gun, I secured the flanges on each side of the batt to the studs.
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