How do I calculate the temperature of the wall from exterior to interior
Hello all, If I am given a wall with the exterior and interior temperature and I'm asked to determine the temperature let's say at the midpoint of the insulation....how do I calculate this?
Thanks!

There are two methods, ratio method and a formula.
Ratio Method: At the point in question, if 80% of the R value is on the inside of the wall, the temp at that point is 20% less than the outside temp.
Formula: Temp @ point = Temp Outside + [ (R outside / R total) x delta T ]
I struggled with this one too and delved a lot into it, but the ratio method is what I think is the best because questions on the test will likely be in a simplistic format.
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