During an inspection, what should the inspector check for regarding attic insulation?

The inspector should focus on the thickness of the attic insulation because it directly relates to the insulation's effectiveness in reducing heat transfer and maintaining energy efficiency within the home. Adequate insulation thickness is crucial for preventing heat loss in the winter and keeping the space cooler in the summer. Insulation must meet specific R-values (a measure of thermal resistance) to be considered effective, and these R-values vary based on climate zones.

While the color of insulation may indicate whether it has been exposed to moisture or other environmental factors, it does not provide a definitive measure of its insulating capabilities. The age of insulation can suggest its potential wear but does not directly refer to its current performance if it has been maintained properly. Similarly, knowing the manufacturer could provide insights into the quality of the materials but doesn't equate to assessing how well the insulation performs based on thickness. Thus, thickness is the most critical factor for an inspector to evaluate during an inspection of attic insulation.