California Residential Inspector Practice Exam

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

Prepare for the California Residential Inspector Exam. Utilize interactive quizzes and detailed explanations to master the required knowledge. Enhance your test-taking skills and boost your confidence for achieving high scores!

Practice this question and more.

How many layers of underlayment are required for asphalt shingles installed on roof slopes of 4:12 or greater?

One
Two
Three
Four

The correct answer is: One

For asphalt shingles installed on roof slopes of 4:12 or greater, the requirement is for one layer of underlayment. This standard is established because roofs with slopes of 4:12 or greater are less prone to water accumulation and have a lower risk of leaks compared to roofs with lower slopes. The single layer of underlayment serves as a secondary barrier, providing waterproofing and supporting the shingles. It is designed to allow any moisture that gets beneath the shingles to escape while also offering some degree of protection against wind-driven rain. In contrast, roofs with lower slopes may require additional layers of underlayment to effectively manage the increased risk of leaks due to standing water. Understanding the specific requirements based on the roof slope is crucial for ensuring proper installation and compliance with building codes and standards. This knowledge helps inspectors assess whether a roofing job meets the necessary guidelines for durability and performance.