Cultured Stone
EZ Scaffold Corp.
EZG Manufacturing
Federated Insurance
Fraco USA, Inc.
Hydro Mobile, Inc.
Kennison Forest Products, Inc.
Mortar Net Solutions
Non-Stop Scaffolding
Norton Clipper
Southwest Scaffolding
The Belden Brick Company
Xtreme Manufacturing
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Vapor Retarder

Function & Code Requirements

Vapor retarders minimize the movement of moisture from the interior of the building into the cavity wall where condensation can degrade insulation and structural members. As per R318.1 2006 IRC (International Residential Code), “In all framed walls, floors and roof ceilings comprising elements of the building thermal envelope, a vapor retarder shall be installed on the warm-in-winter side of the insulation.


  1. In construction where moisture or freezing will not damage the materials.
  2. Where the framed cavity or space is ventilated to allow moisture to escape.
  3. In counties identified as in climate zones 1 through 4 in Table N1101.2.” Vapor retarders, while required by the 2003 International Building Code, are not mentioned in the 2006 International Building Code.

Continuous vapor barriers to reduce the passage of water vapor into the wall generally are used only when insulation is placed on the inside face of the wall. The relatively small amount of moisture that does get into the wall from the inside of the building will diffuse provided that the exterior surface is “breathable.”

Companies Offering Vapor Barriers, Liquid-Applied

Company City State
MCAA Member Hohmann and Barnard, Inc. Hauppauge NY
MCAA Member Crown Masonry & Construction Materials, LLC Kansas City KS
MCAA Member Ernest Maier, Inc. Bladensburg MD
MCAA Member MASONPRO, Inc. Northville MI
MCAA Member Thompson Building Materials, Inc. San Diego CA
MCAA Member Waldo Bros. Company Boston MA

“The MCAA is truly trying to move the masonry industry forward.”

Thomas Cummer
Cummer Masonry, Inc.
MCAA member since 2003

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