Coastal and Floodplain Construction Inspector's Practice Exam

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What feature must be adhered to for underlayment in high wind areas?

Spacing of fasteners
Type of underlayment used
Weight of the underlayment
Surface texture of the underlayment

The correct answer is: Spacing of fasteners

In high wind areas, the spacing of fasteners is crucial to ensure that the underlayment remains securely attached to the structures it protects. Proper fastener spacing helps to resist the uplift forces created by high winds. With insufficient spacing, the underlayment could become loose, allowing wind-driven rain and debris to penetrate beneath roofing materials, potentially causing damage to the roofing system and the structure itself. While the other options may play a role in the overall performance of the roofing system, fastener spacing specifically addresses the challenges posed by high winds, making it a critical consideration for installations in these environments. The type of underlayment used, its weight, and surface texture can influence performance but do not directly relate to the fastening method required to secure the underlayment against wind forces.