Vermiculite

Definition

Expanded mica used as an insulating fill or a lightweight aggregate.

Purpose

Vermiculite is used for insulation, lightweight concrete aggregates, and as a soil amendment in horticulture. Its properties improve thermal insulation, reduce concrete weight, and enhance soil aeration and moisture retention.

Examples of Use

1. Used as attic insulation to improve energy efficiency in homes.
2. Mixed into lightweight concrete for constructing fire-resistant walls.
3. Added to potting mixes to improve soil aeration and water retention for plants.

Related Terms

• Perlite: Another lightweight aggregate used in construction and horticulture.
• Insulation: Material used to reduce heat transfer.
• Lightweight Concrete: Concrete that uses lightweight aggregates like vermiculite or perlite.

Notes

Vermiculite was historically associated with asbestos contamination, so it’s important to source it from reputable suppliers to ensure safety.

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