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Glossary of Roofing Terms - Y

Yellowing: The process whereby a white or clear coating becomes yellow as a result of aging.

Yelm: A bundle of combed straw or reeds used as thatch.

Yield: The amount of finished product produced from a known quantity of ingredients.

Yield Strength: The amount of stress a material can undergo before achieving a non-reversible change of shape, or permanent deformation. Prior to the yield point, stress may result in elastic behavior, where the material will return to its previous shape after the stress is removed.