One of our NORMI-trained inspectors goes up into the attic itself instead of shining a flashlight through the hatch, walking the sheathing, rafters, joists, and any HVAC equipment stored up there for active growth or old staining. A moisture meter comes out too, because framing can look completely dry on the surface while the wood underneath is still soaked through. Soffit, ridge, and gable vents each get tested for actual airflow rather than eyeballed to confirm they exist, and bathroom and kitchen exhaust ducts get followed to their termination point, since a duct that quietly empties into the insulation instead of venting outside is a shortcut we see constantly in older additions and converted garages.
When something looks questionable, we can collect an air sample, a surface sample, or both, and send them to an accredited third-party lab rather than rely on a guess. Most inspections take one to two hours from start to finish. Afterward, you get a written report explaining what we saw up there, any lab results if we took samples, and what we think you should do about it.