CSLB Class B General Contractor's License Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the CSLB Class B General Contractor's License Test with interactive flashcards and multiple choice questions. Each question offers hints and explanations to enhance your understanding and readiness for the exam.

Practice this question and more.

What is the recommended R-value range per inch for mineral fiber insulation?

1.20 to 2.00
2.20 to 3.00
3.00 to 4.00
4.20 to 5.00

The correct answer is: 2.20 to 3.00

The correct answer reflects that mineral fiber insulation typically has an R-value in the range of 2.20 to 3.00 per inch. R-value is a measure of thermal resistance, indicating how effectively an insulating material resists heat flow. Higher R-values represent better insulating properties. Mineral fiber insulation, which includes fiberglass and rock wool, is widely used in residential and commercial buildings due to its good thermal and sound insulating properties. The specified range of 2.20 to 3.00 means that for every inch of this type of insulation, it offers an adequate level of thermal resistance, making it a popular choice for energy efficiency in structures. This range is significant for contractors and builders to know, as selecting materials with appropriate R-values is essential for meeting building codes and ensuring energy efficiency in construction projects. Understanding the insulation's performance ensures that buildings maintain comfortable temperatures and minimizes energy consumption, which is highly valued in modern construction practices.