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Conductor wall with internal/external insulation

  1. May 22, 2014 #1
    1. The problem statement, all variables and given/known data
    Doing my homework I came across the question:
    why it would be better to have styrofoam on the inside of the house
    And why it could be better to have it on the outside

    The answer is
    The steady state will be the same for both but
    inside: warm and cold quickly
    Outside: temperature will be more stable

    Im just not understanding why it is like this... Can someone explane this to me?
  2. jcsd
  3. May 23, 2014 #2


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    Typically schoolbook. What they are after: heating and cooling the house itself also requires heat. So with the insulation on the inside, the interior doesn't have to provide that heat (/cold). With the insulation on the outside, once the steady state is established, the house walls provide a buffer.

    In practice nobody in his right mind has styrofoam on the outside: birds nest in it, it's vulnerable, etc. Inside idem: not sturdy enough. So isolate between walls or under floors, under roof tiles. But variations are imaginable: with a protective layer of wood or gypsum.
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