Well, if you follow the 10* buffer rule, you should have insulation rated to 10* F if you're camping in 20* F. Unfortunately, a space blanket probably isn't going to take your 30* TQ and 20* UQ and make that a 10* or even 20* setup. However, you'll find a small number of people (as Peppy indicated) who claim to take a 40* set to the teens.
I have never used a space blanket as a TQ supplement. Most of them are too fragile for that. I only used a space blanket taped to my pad a couple of times, and the condensation was too much for me.
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