InstaBidsWhat is parging?
Parging is a mortar coating that smooths a masonry surface, such as a foundation wall or a brick chimney smoke chamber. Its material and moisture-control role depend on the wall and the surrounding system.
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What is parging made of?
CMHA describes cement-and-sand or mortar parge coats for below-grade concrete masonry. Its 1:3.5 ratio is a material specification in that system, rather than a universal mix for every wall; historic masonry needs a compatible material. “A portland cement and sand mix (1:3.5 by volume), or Type M or S mortar may be used for the parge coat.” Source: Concrete Masonry & Hardscapes Association, read 2026-10-31.
What is Vancouver's parging definition?
Parging means coating a foundation wall with mortar to create a smooth surface. The City of Vancouver, Washington, defines it this way in its housing rehabilitation specifications; this local specification describes the finish rather than a nationwide requirement. “Parging is applying a smooth coat of mortar on a foundation wall.” Source: City of Vancouver, Washington, read 2026-10-31.
Does parging waterproof a wall?
A parge coat alone should not be read as a complete groundwater-control system. In its concrete-masonry guidance, CMHA describes a separate bituminous layer over parging to increase resistance to water penetration; drainage and the full wall system matter. “To further increase water penetration resistance, a bituminous coating is applied over the parging.” Source: Concrete Masonry & Hardscapes Association, read 2026-10-31.
Can parging be applied over brick?
Yes. One specific example is the brick smoke chamber inside a chimney: the Chimney Safety Institute of America describes a mortar coating that smooths that chamber. This example does not establish that every exterior brick wall should receive the same coating. “Parging is a coating of mortar applied to the brick to give the smoke chamber a smooth surface.” Source: Chimney Safety Institute of America, read 2026-10-31.
Should old stone be parged with hard cement?
Material compatibility matters on historic stone. The National Park Service warns against impervious, cement-rich coatings in its historic-masonry guidance because a wall must be able to release moisture. A modern hard coat is not automatically suitable for older soft masonry. “When repairs are considered, coating with an impervious material such as high‐content portland cement is never recommended.” Source: National Park Service, read 2026-10-31.
Sources
- Housing Rehabilitation Specifications: Parging — City of Vancouver, Washington; published Undated specification; hosted February 2024; read 2026-10-31.
- TEK 19-03B: Preventing Water Penetration in Below-Grade Concrete Masonry Walls — Concrete Masonry & Hardscapes Association; published Undated online technical guide; read 2026-10-31.
- Parging a smoke chamber: What’s involved — Chimney Safety Institute of America; published 2015-02-02; read 2026-10-31.
- This Masonry is for the Bees! — National Park Service; published 2007; online article; read 2026-10-31.