Market Broiler Management Practice Test

Which of the following has the highest R-value per 2.5 cm (1")?

1. Fiberglass insulation

2. Polystyrene foam

3. Polyurethane foam unfaced

4. Cellulose insulation

The correct answer is: Polyurethane foam unfaced

Polyurethane foam unfaced is known for its high insulation efficiency, reflecting a significant R-value per inch compared to other types of insulation materials. The R-value measures the material's resistance to heat transfer, with a higher R-value indicating better insulating properties. Polyurethane foam typically reaches an R-value of around 6 to 7 per inch, making it one of the most effective insulating materials available. In contrast, materials like fiberglass insulation usually have an R-value around 2.9 to 4.3 per inch, depending on the type. Polystyrene foam's R-value ranges around 3.6 to 5.0 per inch, and cellulose insulation generally has an R-value of about 3.1 to 3.7 per inch. Thus, while each material provides a degree of insulation, polyurethane foam unfaced stands out for its superior heat resistance, which is why it is the correct answer to this question.