What is "continuous insulation" (CI) as defined in energy codes and why is it beneficial?

• A. CI refers to insulation uninterrupted by studs or other structural members; reduces thermal bridging and improves overall envelope performance.
• B. CI means insulation is painted continuous color.
• C. CI reduces only interior humidity, not thermal bridging.
• D. CI is irrelevant to energy codes.

Answer: (A)

Continuous insulation means the insulation layer runs without gaps or interruptions across the building envelope, so it isn’t broken up by studs or other framing members. This setup prevents thermal bridging, where heat can sneak through framing more easily than through the insulated material. By creating a continuous plane of insulation, the overall resistance to heat flow increases, giving a higher effective R-value and more uniform surface temperatures on both sides of the wall. Energy codes favor CI because it improves envelope performance and helps meet required thermal resistance, reducing heating and cooling loads. CI can be applied on exterior or interior sides, as long as the insulation remains uninterrupted across the framing. The other statements don’t fit CI’s purpose: it isn’t about painting color, it isn’t primarily about interior humidity, and it is indeed relevant to energy codes.