Master Craftsman Shingle Applicators Manual Practice Test

What is the reinforcing material for asphalt roofing manufactured from glass fibers?

Fiber Glass Mat Felt Fiber Glass Shingles Downspout

Correct Answer:

Fiber Glass Mat

Explanation:

The reinforcing layer is a fiberglass mat. This glass-fiber mat sits inside the asphalt shingles, providing strength, tear resistance, and dimensional stability. It’s embedded in asphalt to create a durable, waterproof core. Felt is an older, organic base, and the option describing shingles themselves isn’t the reinforcing material. Downspout is unrelated.

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