Vapor-Retarding Membranes for Back-Up Walls Bakersfield CA

Applying a rubberized asphalt membrane over the surface of the concrete masonry would make a more effective vapor-retarding membrane than would an application of an asphaltic paint in Bakersfield.

Mike Emerson Masonry
(510) 782-8222
247 Folsom Ave
Hayward, CA
 
Dodge Construction Inc
(818) 344-8254
6957 Amestoy Ave
Van Nuys, CA
 
Stonecrafters
(310) 680-7070
508 N Oak St
Inglewood, CA
 
Stoddard Masonry And Stone
(310) 672-7324
815 N La Brea Ave
Inglewood, CA
 
Sundance Landscapes
(831) 424-2099
17146 Wilson Way
Salinas, CA
 
A Chim Chim Cheree
(714) 962-1331
19111 Bushard St
Huntington Beach, CA
 
Jarak Stone & Tile Co
(510) 582-1100
571 Jackson St
Hayward, CA
 
Saiers Masonry
(209) 320-1080
7500 West Ln
Stockton, CA
 
I & H Contracting
(818) 708-0373
15025 Saticoy St Apt 20
Van Nuys, CA
 
Lyle Faber Masonry
(760) 743-3620
1504 Sheridan Ave
Escondido, CA
 

Vapor-Retarding Membranes for Back-Up Walls

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Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: November 1, 1999

I have heard people recommending asphalt coatings for the exterior face of the concrete masonry back-up wall in cavity wall construction to act as a vapor-retarding membrane. This is particularly true with an exterior wythe of glazed brick. If the intent is to create a vapor-retarding membrane on the surface of the block, wouldn't it be better to use an impervious sheet membrane, such as rubberized asphalt? The surface of the concrete masonry is typically very rough, and an asphalt coating would typically contain pinholes.

Applying a rubberized asphalt membrane over the surface of the concrete masonry would make a more effective vapor-retarding membrane than would an application of an asphaltic paint. However, before applying any coating, you must ask yourself whether this is the proper place for a vapor-retarding membrane. A vapor-retarding membrane should be on the warm side of the insulation. Therefore, over a large portion of the United States, the heating season dictates that the vapor barrier be on the interior side of the insulation. For insulated cavity walls, this would be the exterior surface of the concrete masonry backup wythe. However, when insulation is not placed in the cavity, it would typically be either within the cells of the masonry backup or on the interior surface of the concrete masonry.

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