I'm looking to tackle another UQ project for myself and a friend, and have found conflicting information regarding the temp rating of climashield apex. In your opinion, what would an UQ with 2.5 oz, 5 oz, 7.5 oz, and 10 oz of climashield apex insulation be rated at?
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Assuming a well designed, draft free, dif cut UQ ( to allow a nice snug fit and help avoid compression of insulation):Originally Posted by darkbyrd
2.5 = mid/high 40s to 50F(at least)
5= 20 to 30
7.5 mid teens
10= zero to 5F
This is based on my personal experience at the warmer temps and using no other layers except cotton t shirt and jeans, with a CS WB Yeti. The rest is based on extrapolations from the warmer temps, plus what I have heard from some other folks, but in all cases using CS XP. Some say CS Apex is warmer for the weight, but I don't really know yet. Plus of course, people vary greatly and the above is when I or others were dry and well fed, and wind absent or well blocked.
I have a TQ with 2.5 and its good down to about 50,,,,,for me
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I have used 6.0 and had it to the high. 20s wit no cold spots. It really is great stuff. Pretty light and toasty warm.
Just finished my TQ/UQ made from 5.0 Apex. I will be doing testing in next few months and hoping to get down to 30. I'll report back.
I made a 7.5 (1 layer 5, 1 layer2.5) uq last month. It has worked fine down to a low of 44 so far. As a very cold sleeper, I expect it to get me to 20-25.
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+1 on the numbers from BillyBob for 2.5 & 5.0 Apex-These are good ranges for both UQ & TQ from my experience with both weights of insulation. I have not used anything above 5.0
+2 on BB58's Apex 5.0 evaluation.
I made a UQ last year using this insulation and using it for bottom insulation, I was right at the edge of comfortable at 30 degrees. I probably could have squeezed 5 more degrees out of it by adding CCF pads.
I don't have any experience with the other weights.
SE
I have a diy TQ, and UQ of 5 oz apex and have had it down to the upper 30's. and at those temps the TQ was plenty warm and I could probably push it down to below freezing, but was at the the lower limit for the UQ. personally I sleep rather cold.
The formula for figuring temperature ratings from CLO values is as follows:
84 - (14 * CLO * X), where the final result is in degrees F, CLO is the CLO value of the material and X is the weight of the insulation in oz/sq yd. Note that this assumes no base layer worn (if there is a full base layer, change the 84* to 70*)
So, for Climashield APEX (CLO value 0.82, per Thru-Hiker), the value would be:
84 - (14 * 0.82 * X)
= 84 - (11.48 * X)
So, 2.5 oz:
84 - (11.48 * 2.5)
= 84 - 28.7
= 55.3*
5 oz:
84 - (11.48 * 5)
= 84 - 57.4
= 26.6* F
7.5 oz:
84 - (11.48 * 7.5)
= 84 - 86.1
= -2.1* F
10 oz:
84 - (11.48 * 10)
= 84 - 114.8
= -30.8* F
Now, below freezing, these calculations break down some. Since moisture accumulation through condensation, as well as drafts, become much more important when the outside temperature is 70*+ different from your skin temperature, the insulation you're using has to be much better fitted than at warmer temperatures. Figure these as "ballpark" temperatures, assuming a "normal" sleeper, perfect humidity, no drafts, and no wind.
Figure on them being within 10* of comfort and you should be pretty close. Hope it helps!
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