Massachusetts Construction Supervisor License (CSL) Practice Test

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Study for the Massachusetts Construction Supervisor License Test. Use flashcards and multiple choice questions with hints and explanations. Prepare thoroughly for your exam!

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Is underlayment required when installing asphalt shingles on a roof with a 3:12 pitch?

No, it's not required
Yes, it's required
Only for roofs over 30 degrees
Only in snow regions

The correct answer is: Yes, it's required

Underlayment is indeed required when installing asphalt shingles on a roof with a 3:12 pitch. The primary purpose of underlayment is to provide a secondary layer of protection against moisture that may seep in through the shingles, especially in areas with lower slopes. A roof with a pitch of 3:12 is considered a low-slope roof according to many building codes and best practices. In these scenarios, the additional barrier created by the underlayment helps prevent water infiltration, which can occur due to rain, snow, or ice that could accumulate or slide down the roof. The inclusion of underlayment in roofing systems enhances durability and increases the overall lifespan of the roofing materials used. Therefore, manufacturers and building codes generally mandate the use of underlayment in these situations to ensure robust protection for the underlying structural components.