Illinois Roofing Practice Exam 2025 - Free Roofing License Practice Questions and Study Guide

Question: 1 / 745

What term is used to describe the layer of material applied to a roof surface to provide an even base or support?

Sheathing

Underlayment

The term used to describe the layer of material applied to a roof surface to provide an even base or support is underlayment. Underlayment serves several important functions. It acts as a protective barrier against moisture and adds a layer of insulation, which can help in reducing energy costs. This layer is usually made from materials such as felt, synthetic membranes, or other waterproof materials that facilitate water drainage while protecting the roof structure.

Underlayment is installed directly on top of the decking (the structural surface of the roof) but below the roof covering material, such as shingles or tiles. Unlike sheathing or decking, which refer to the structural components of the roof, underlayment is primarily designed to provide a smooth, even surface and extra protection against weather-related issues, ensuring the longevity and effectiveness of the roof.

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Decking

Insulation

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