What is a primary consideration when selecting insulation for a building?

The primary consideration when selecting insulation for a building is the R-value, which measures its thermal resistance. The R-value indicates how effective the insulation is at preventing heat flow; a higher R-value signifies better insulating properties. This is crucial because proper insulation helps maintain a comfortable indoor environment, reduces energy costs, and enhances overall energy efficiency in the building.

While cost, availability, and thickness are important factors, they do not directly reflect the insulation's performance in terms of thermal resistance. Cost considerations can vary widely, and while it's important to manage expenses, the effectiveness of the insulation in reducing heat transfer is a more critical factor. The availability of local suppliers can affect procurement but doesn’t influence the insulation’s ability to perform its main function. Thickness can contribute to achieving specific R-values, but insulation should always be evaluated primarily on its thermal resistance capacity to ensure optimal performance in maintaining energy efficiency.