1. ## Temperature affect

How will stacking quilts affect the temperature rating? A 0* and a 20* UQ stacked would have an approximate rating of?

2. Can't give you an exact number. The 20* will certainly add a lot to the 0*. if the two are stacked in such a way that both of their lofts are not compressed in any way it should be toasty.

3. Originally Posted by Bubba
Can't give you an exact number. The 20* will certainly add a lot to the 0*. if the two are stacked in such a way that both of their lofts are not compressed in any way it should be toasty.
Agreed. I would think it'd bring you down to at least -15 or 20. As a note, LeighLo has a pretty good video on stacking underquilts. Check out this page, half way down, under Stacking UQs for Deep Winter:
http://www.hammockquilts.com/apps/videos/

4. Originally Posted by Old Man
How will stacking quilts affect the temperature rating? A 0* and a 20* UQ stacked would have an approximate rating of?
This thread from WhiteBlaze gives a formula that Pan from JRB provided.

x - ((70 - y)/2) = z

x = first bag (higher rated/lower degree)
y = second bag (lower rated/higher degree)
z = rating of doubled bags

Extra set of parenthesis to make it crystal clear that the x is not divided by 2, just the 70-y part. I think you're correct about the order of operations implying that anyway, but the parenthesis makes it clearer for anyone who hasn't had math in a while!

5. ## Thanx

The formula gives what i was looking for and approximate -25* winter camping insulation. time to head out its suppose to be -10* on Wed.

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