The problem we are concerned with is simple -

The IECC residential section fails to provide reduced prescriptive R-values for roof insulation in homes with unvented attics or unvented rafter assemblies. (It should.)

When is the code going to unify and give builders a base of information to decipher that makes sense. We can build better homes cheaper... if we have baseline to start from.  Time to do something about it. Sign up today.