For part (a), according to EPA, the energy rater "shall use their experience and discretion" to determine whether a home passes or fails the thermal bypass inspection. LEED for Homes follows this same principal. For part (b), at least 90% of the insulation must be visible to confirm that the minimum requirements were met. If less than 90% of the insulation can be inspected and verified, the home must follow the performance pathway (EA 1) and downgrade the insulation in the model accordingly. Applicable Internationally.