You understand a building's roof assembly serves an important
role in improving the building's overall energy efficiency and
reducing building owners' heating and cooling costs. However, you
may not realize codes mandate minimum thermal insulation
requirements for the energy efficiency of most buildings and, in
some instances, these minimum R-values may be more than you are
accustomed to providing.
Energy conservation codes usually are adopted by states and
apply to all buildings in a state. Most states have adopted one of
several editions of the International Energy Conservation Code
(IECC), published by the International Code Council (ICC), to serve
as the technical basis of their energy codes. In some instances,
states modify IECC to address specific regional or local
In several instances, jurisdictions or cities may adopt an
energy code that is different from the state-adopted code. For
example, Chicago has developed and maintains an energy conservation
code that is somewhat different from Illinois' state energy
conservation guidelines. However, Chicago's energy conservation
code still is...
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