Plaster

Definition

Plaster is a cementitious material, usually based on gypsum or Portland cement, which is applied to lath or masonry in paste form to harden into a finished surface. It is a mixture of lime, hair, and sand, or lime, cement, and sand, used to cover exterior or interior wall surfaces.

Purpose

Plaster is used to create smooth, durable surfaces on walls and ceilings. It provides a finished surface that can be painted or decorated and also improves the fire resistance and soundproofing of buildings.

Examples of Use

• Interior Walls: Applying plaster to walls to create a smooth, paintable surface.
• Ceilings: Using plaster to finish ceilings and create decorative details.
• Exterior Surfaces: Covering exterior walls with plaster to protect against the elements and enhance appearance.

Related Terms

• Stucco: A type of exterior plaster used for wall surfacing and decoration.
• Drywall: A construction material made of gypsum board used as an alternative to plaster.
• Lath: A framework of wood or metal used as a base for plaster application.

Notes

• Application: Plaster is applied in multiple coats, starting with a scratch coat followed by a brown coat and a finish coat.
• Maintenance: Plaster surfaces can be repaired and patched if cracks or damage occur.