What type of underlayment is used for covering horizontal joints?

Prepare for the Seabee BU A‑School Building Basics Test. Boost your skills with flashcards and multiple-choice questions, with hints and explanations provided. Gear up for success on your exam!

The choice of single underlayment for covering horizontal joints is appropriate because it provides a straightforward, effective solution for weatherproofing and enhancing the durability of roofing systems. Single underlayment acts as a barrier against moisture and leaks, ensuring that any potential water infiltration is managed appropriately at the joints where two sections of material overlap.

By using a single layer, the installation process is simplified, which can help prevent complications that may arise from additional layers, such as issues with heat buildup or moisture retention. Furthermore, a well-installed single underlayment can adequately support the shingles above, ensuring a reliable defense against the elements.

This approach is commonly recommended in roofing practices to maintain roofing integrity without unnecessarily complicating the installation process.

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