So I am playing with an insulated bridge design and headed to bed last night to try it one more time before taking on version 2.
It is insulated with one full layer of Apex 2.5, and one torso layer 22x48. I used a CFF pad in my bag under my feet. So 5.0 Apex under my torso, and 2.5 oz and CFF pad under my feet.
I went to bed in a 10-15 year old 750 fill down bag originally rated at 15*. I wore a merino 1, Cap 3, and Montbell UL down top. Cap 4 hat and fleece baklava, no pants and darn tuff socks.
Point being- it was around 25-30 when I went to bed, but dropped to 7 or so (9 when I woke up) with wind chills below zero. High tarp, no windsock. I'm not going to say I had toasty uninterrupted sleep, but I slept for decent stretches and rolled over from time to time.
Why did this work?
Thus far in my experimenting with Hammocks it seems like you need MORE insulation in you UQ, but I had at best 30-40* of insulation under me, and let's just call it 5* worth up top.
What are the thoughts of you more experienced hangers?
Granted it's one night, but it throws off my thoughts thus far in regard to sizing UQ's.
Do others match top and bottom insulation evenly or have some of you found you don't need as much underneath?
I've been thinking you need to go heavier under than over- but is the opposite true?