The energy heel on a roof must be at least:

The energy heel on a roof is designed to accommodate insulation that extends to the edge of the roof without compressing it, ensuring that the roof maintains its energy efficiency. A minimum energy heel height of 6 inches is specified to allow for ample insulation, which aids in preventing heat loss and gaining over time.

This specification helps to ensure that the insulation layer is effective at minimizing energy transfer, which is essential for achieving good thermal performance in a roof assembly. The height allows for enough space to ensure that the insulation fits properly while keeping the roof structure intact and functional. Insufficient heel height could result in inadequate insulation coverage and potential energy loss, leading to increased heating and cooling costs.

Understanding this requirement is crucial for contractors as it directly impacts the overall energy efficiency of a building and compliance with building codes related to energy conservation.