Sustainability · Defined
R-value
A measure of resistance to heat flow through a material or assembly under stated conditions.
Why it matters
The nominal insulation value and whole-assembly performance can differ because of framing, gaps, and installation. Units and test basis must be consistent when comparing values.
In practice
A project example
A well-rated insulation product does not eliminate heat flow through an uninsulated slab edge.
General educational guidance from KOW Building Consultants. Examples are illustrative, not project records. The applicable contract, standard, program, and jurisdiction control the requirements for a specific assignment.